Статті в журналах з теми "Horizontal connection"
Щоб переглянути інші типи публікацій з цієї теми, перейдіть за посиланням: Horizontal connection.
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 статей у журналах для дослідження на тему "Horizontal connection".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте статті в журналах для різних дисциплін та оформлюйте правильно вашу бібліографію.
1
Tan, Kang Hai, and Xiao Ping Yang. "Horizontal Connection and Horizontal Mean Curvature in Carnot Groups." Acta Mathematica Sinica, English Series 22, no. 3 (August 15, 2005): 701–10. http://dx.doi.org/10.1007/s10114-005-0572-y.
Повний текст джерела
2
Hadjikhani, Amjad, and Peter Thilenius. "The impact of horizontal and vertical connections on relationships' commitment and trust." Journal of Business & Industrial Marketing 20, no. 3 (May 1, 2005): 136–47. http://dx.doi.org/10.1108/08858620510592759.
Повний текст джерелаАнотація:
PurposeWhile an ever‐increasing body of research on business networks has commented on vertically connected relationships, this study embeds the horizontally connected relationships. Constructed on business network theories the paper aims to add more knowledge on business networks by developing a connection model including both vertical and horizontal connections. The model aims to explore the impact of connections on focal business relationships. It differentiates connected relationships on the basis of their vertical and horizontal natures. The purpose is to grasp the impact of these different connected relationships on the focal business relationship. The focal relationship elements are defined by commitment and trust, which capture their properties from the dyadic interaction and the two types of connected relationships.Design/methodology/approachThe paper tests the theoretical construction empirically. The empirical study is based on the IMP2 survey, utilizing information from extensive interviews with 138 firms regarding their relationships with important foreign customers.FindingsThe statistical findings in the form of a LISREL‐model clearly expose the impact of the horizontal connections and verify the validity of the theoretical model. It depicts that trust increase by vertical connections leading to increased commitment, thus strengthening the relationship while horizontal connection, on the contrary, weakens it. The facts also demonstrate how the horizontal connections impose effects on technological long‐term investments.Originality/valueMarketing researchers advocating certain theoretical views are thereby required to observe respect for the market realities with which managers are confronted.
3
Tan, Kang-Hai, and Xiao-Ping Yang. "On some sub-Riemannian objects in hypersurfaces of sub-Riemannian manifolds." Bulletin of the Australian Mathematical Society 70, no. 2 (October 2004): 177–98. http://dx.doi.org/10.1017/s0004972700034407.
Повний текст джерелаАнотація:
We study some sub-Riemannian objects (such as horizontal connectivity, horizontal connection, horizontal tangent plane, horizontal mean curvature) in hypersurfaces of sub-Riemannian manifolds. We prove that if a connected hypersurface in a contact manifold of dimension more than three is noncharacteristic or with isolated characteristic points, then there exists at least a piecewise smooth horizontal curve in this hypersurface connecting any two given points in it. In any sub-Riemannian manifold, we obtain the sub-Riemannian version of the fundamental theorem of Riemannian geometry: there exists a unique nonholonomic connection which is completely determined by the sub-Riemannian structure and is “symmetric” and compatible with the sub-Riemannian metric. We use this nonholonomic connection to study horizontal mean curvature of hypersurfaces.
4
Polyakova, K. V. "Prolongations of affine connection and horizontal vectors." Differential Geometry of Manifolds of Figures, no. 51 (2020): 86–102. http://dx.doi.org/10.5922/0321-4796-2020-51-11.
Повний текст джерелаАнотація:
The linear frame bundle over a smooth manifold is considered. The mapping dе defined by the differentials of the first-order frame e is a lift to the normal N, i. e., a space complementing the first-order tangent space to the second-order tangent space to this bundle. In particular, the mapping defined by the differentials of the vertical vector of this frame is a vertical lift into normal N. The lift dе allows us to construct a prolongation both of the tangent space and its vertical subspace into the second-order tangent space, more precisely into the normal N. The normal lift dе defines the normal prolongation of the tangent space (i. e. the normal N) and its vertical subspace. The vertical lift defines the vertical prolongation of the tangent space and its vertical subspace. The differential of an arbitrary vector field on the linear frame bundle is a complete lift from the first-order tangent space to the second-order tangent space to this bundle. It is known that the action of vector fields as differential operators on functions coincides with action of the differentials of these functions as 1-forms on these vector fields. Horizontal vectors played a dual role in the fibre bundle. On the one hand, the basic horizontal vectors serve as operators for the covariant differentiation of geometric objects in the bundle. On the other hand, the differentials of these geometric objects can be considered as forms (including tangential-valued ones) and their values on basic horizontal vectors give covariant derivatives of these geometric objects. For objects which covariant derivatives require the second-order connection, the covariant derivatives are equal to the values of the differentials of these objects on horizontal vectors in prolonged affine connectivity. Prolongations of the basic horizontal vectors, i. e., the second-order horizontal vectors for prolonged connection, were constructed. The second-order tangent space is represented as a straight sum of the first-order tangent space, vertical prolongations of the vertical and horizontal subspaces, and horizontal prolongation of the horizontal subspace.
5
Kobelev, A. G., and D. S. Chashkin. "Horizontal counterblow hammer with hydraulic mass connection." Izvestiya MGTU MAMI 7, no. 2-2 (March 20, 2013): 183–87. http://dx.doi.org/10.17816/2074-0530-68190.
Повний текст джерелаАнотація:
This article describes the design of the horizontal counterblow hammer and principle of its operation. The purpose of its development is to improve the timing accuracy of oncoming traffic impact of the masses. The result is the development of new design that combines hydraulic synchronization mechanism and a horizontal layout of the hammer
6
Yalikun, Yaxiaer, Nobutoshi Ota, Doudou Ma, and Yo Tanaka. "Horizontal connection method for glass microfluidic devices." Micro & Nano Letters 15, no. 5 (April 2020): 333–38. http://dx.doi.org/10.1049/mnl.2019.0603.
Повний текст джерела
7
Chu, Qi, Haiqing Liu, Shengyong Xia, Jinfeng Dong, Ming Lei, Tim K. T. Tse, Lingxiao Teng, Cruz Y. Li, and Yunfei Fu. "Numerical and Experimental Study on the Member Performance and Stability Bearing Capacity of Wheel Coupler Formwork Supports." Applied Sciences 12, no. 20 (October 17, 2022): 10452. http://dx.doi.org/10.3390/app122010452.
Повний текст джерелаАнотація:
To evaluate the performance of wheel coupler formwork support components, the bearing capacity of the horizontal bar, the shear capacity of the wheel, the shear capacity of the sleeve, and the stability bearing capacity of the single- and double-layer vertical poles were investigated through systematic full-scale tests. The feasibility and correctness of the experiment were verified by comparing the results with those of a finite element analysis. The results demonstrated that the weak point of the horizontal bar was the bearing capacity of the weld at the connection between the socket and the horizontal bar. Preventing buckling failure of the weld at the connection between the horizontal bar and the socket was critical to ensure the bearing capacity of the horizontal bar. Under the action of a shearing force, the wheel underwent buckling failure of the welding seam at the connection between the wheel and the vertical pole. With a decreasing number of connecting horizontal bars on the wheel, the shear capacity of the wheel decreased significantly. The shear failure mode of the sleeve was buckling failure. The connection weld did not undergo buckling failure during the load-bearing process, which was basically meeting the serviceability state. The failure of a single-layer vertical pole was typical with lateral displacement buckling, while the double-layer vertical pole did not undergo buckling with lateral displacement.
8
Girhammar, Ulf Arne, and Bo Källsner. "Tests and Analyses of Slotted-In Steel-Plate Connections in Composite Timber Shear Wall Panels." Advances in Civil Engineering 2017 (2017): 1–20. http://dx.doi.org/10.1155/2017/7259014.
Повний текст джерелаАнотація:
The authors present an experimental and analytical study of slotted-in connections for joining walls in the Masonite flexible building (MFB) system. These connections are used for splicing wall elements and for tying down uplifting forces and resisting horizontal shear forces in stabilizing walls. The connection plates are inserted in a perimeter slot in the PlyBoard™ panel (a composite laminated wood panel) and fixed mechanically with screw fasteners. The load-bearing capacity of the slotted-in connection is determined experimentally and derived analytically for different failure modes. The test results show ductile postpeak load-slip characteristics, indicating that a plastic design method can be applied to calculate the horizontal load-bearing capacity of this type of shear walls.
9
Yoon, Dong Hyun, Asahi Nakahara, Afshan Jamshaid, Hironobu Sato, Tetsushi Sekiguchi, and Shuichi Shoji. "Matrix Arrangement of Three-Dimensional Sheath Flow for Multiple Component Nanofibers." Journal of Sensors 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/814753.
Повний текст джерелаАнотація:
Multiple core-sheath flow was realized using matrix arrangement of 3D sheath flows. The sheath flow was hydrodynamically formed in a flow shift area which has symmetrical microgrooves on channel walls. Vertical and horizontal alignments of the sample streams are a key element of matrix configuration. The flow shift areas were connected in parallel to achieve horizontal alignment of the sheath flow. The cascade connection of the flow shift areas is used for vertical alignment of the sheath flow. In order to achieve matrix arrangement of core-sheath flow, combination of the parallel and cascade connections was utilized. In this work, the horizontal and vertical configurations of the 2-sample sheath flow were demonstrated. Two streams of the vertically aligned 2-sample sheath flow were joined horizontally, and, as a result, 4-sample core-sheath flow of matrix configuration was obtained successfully.
10
Takiyama, Ken, Yasushi Naruse, and Masato Okada. "Statistical Mechanics of Mexican-Hat-Type Horizontal Connection." Journal of the Physical Society of Japan 78, no. 6 (June 15, 2009): 064002. http://dx.doi.org/10.1143/jpsj.78.064002.
Повний текст джерела
11
Jin, Qiao, Xin Dui, Wei Jian Zhao, Tao Gao Wu, and Wan Nan Guo. "Numerical Analysis of Seismic Behavior of a New-Type Horizontal Wall-to-Wall Connection for Precast Concrete Shear Walls." Applied Mechanics and Materials 353-356 (August 2013): 3589–92. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.3589.
Повний текст джерелаАнотація:
Structural connections are among the most essential parts in prefabricated concrete structures and good-quality design of connections is one major key to a successful prefabrication. A new horizontal wall-to-wall connection way for precast shear wall systems, which have been attempted in the field of modern residential buildings in China, is presented in this paper. An abaqus-based nonlinear finite element (FE) analysis under monotonic loading is implemented in order to understand the seismic performance of the proposed connection way of precast shear walls in comparison with that of the cast-in-place connection way. From the numerical results, it is concluded that the seismic performance of the presented connection technique, such as the deformability and the energy-dissipation capacity, is not weaker than that of its cast-in-place counterpart.
12
Hu, Xi Bing, Yu Wei Yang, Guo Jing He, Yun Lei Fan, and Peng Zhou. "A Moment-Shear Story Model for the Design of Steel Frames with Semi-Rigid Connections." Applied Mechanics and Materials 256-259 (December 2012): 821–25. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.821.
Повний текст джерелаАнотація:
A moment-shear story model using the static condensation method is proposed for the steel frame with semi-rigid connections. Based on the superposition principle under small deformation, the story horizontal deflection can be divided into three parts, due to the action of story shears, the top story moment of column and the connection rotation of bottom story column, respectively. The formulas are derived for its lateral stiffness, horizontal deflection and height ratio of inflection point of column, taking into account the effect of semi-rigid connection. Numerical results indicate that this story model is reliable and can be used for preliminary design of this type of structures.
13
BEJANCU, AUREL. "A NEW APPROACH FOR SPACE-TIME-MATTER THEORY." International Journal of Geometric Methods in Modern Physics 10, no. 04 (March 6, 2013): 1350004. http://dx.doi.org/10.1142/s0219887813500047.
Повний текст джерелаАнотація:
This is the first paper in a series of three papers on a new approach for space-time-matter (STM) theory. The main purpose of this approach is to replace the Levi-Civita connection on the space-time from the classical Kaluza–Klein theory by what we call the Riemannian horizontal connection on the general Kaluza–Klein space. This is done by a development of a 4D tensor calculus whose geometrical objects live in a 5D space. The 4D tensor calculus and the Riemannian horizontal connection enable us to define in a 5D space some 4D differential operators: horizontal differential, horizontal gradient, horizontal divergence and horizontal Laplacian, which have a great role in the presentation of the STM theory in a covariant form. Finally, we introduce and study the horizontal electromagnetic tensor field, the horizontal Ricci tensor and the horizontal Einstein gravitational tensor field, which replace the well-known tensor fields from the classical Kaluza–Klein theory.
14
SOLEIMAN, A. "ENERGY β-CONFORMAL CHANGE IN FINSLER GEOMETRY". International Journal of Geometric Methods in Modern Physics 09, № 04 (6 травня 2012): 1250029. http://dx.doi.org/10.1142/s0219887812500296.
Повний текст джерелаАнотація:
The present paper deals with an intrinsic generalization of the conformal change and energy β-change on a Finsler manifold (M.L.), namely the energy β-conformal change ([Formula: see text] with [Formula: see text]; [Formula: see text] being a concurrent π-vector field and σ(x) is a function on M). The relation between the two Barthel connections Γ and [Formula: see text], corresponding to this change, is found. This relation, together with the fact that the Cartan and the Barthel connections have the same horizontal and vertical projectors, enable us to study the energy β-conformal change of the fundamental linear connection in Finsler geometry: the Cartan connection, the Berwald connection, the Chern connection and the Hashiguchi connection. Moreover, the change of their curvature tensors is obtained. It should be pointed out that the present work is formulated in a prospective modern coordinate-free form.
15
COSTA, R. R. R., M. C. V. LIMA, G. M. S. ALVA, and E. S. MAGALHÃES. "Optimization of the bending stiffness of beam-to-column and column-to-foundation connections in precast concrete structures." Revista IBRACON de Estruturas e Materiais 10, no. 5 (September 2017): 985–97. http://dx.doi.org/10.1590/s1983-41952017000500003.
Повний текст джерелаАнотація:
Abstract This work involved the structural optimization of precast concrete rigid frames with semi-rigid beam-to-column connections. To this end, several frames were simulated numerically using the Finite Element Method. Beams and columns were modeled using bar elements and their connections were modeled using spring elements, with variable bending stiffness. The objective function was based on the search of the least stiff connection able to ensure the global stability of the building. Lastly, a connection model with optimal stiffness was adopted to design the frame. Semi-rigid beam-to-column connections with a constraint factors of 0.33 sufficed to ensure the maximum allowable horizontal displacement and bending moment of the connection, with a global stability parameter of 1.12. This confirms that even connections with low constraints generate significant gains from the structural standpoint, without affecting construction and assembly-related aspects.
16
Jin, Qiao, Wan Nan Guo, Wei Jian Zhao, Bin Zhang, and De Peng Zhang. "Numerical Analysis of Seismic Behavior of a Concealed Bracing Connection for Precast Concrete Shear Walls." Applied Mechanics and Materials 580-583 (July 2014): 1696–99. http://dx.doi.org/10.4028/www.scientific.net/amm.580-583.1696.
Повний текст джерелаАнотація:
Aiming at the horizontal connection joint of the precast shear wall structure, this paper presents a new-type horizontal wall-to-wall connection. Based on the ABAQUS finite element analysis platform, an accurate finite element model of shear connection joints was built. By quasi-static numerical tests, the seismic behavior of the proposed connection of the precast shear wall system was analysed and compared with that of the traditional cast-in-place connection. The numerical results show that the seismic performance of the presented connection, such as deformability and energy-dissipation capacity, is slightly lower than that of its cast-in-place counterpart.
17
Sá Ribeiro, Ruy Alexandre, and Marilene Gomes Sá Ribeiro. "Connection Efficiency of Wood-Concrete Structural Floor System." Key Engineering Materials 600 (March 2014): 105–10. http://dx.doi.org/10.4028/www.scientific.net/kem.600.105.
Повний текст джерелаАнотація:
The wood-concrete research project uses medium to high density reclaimed tropical hardwoods from the Brazilian Amazon region and steel rods scraps from a construction site. The beams studied are composed of a bottom layer of staggered wood boards and a top layer of concrete. The wood members are laterally nailed together to form a wide beam, and horizontal rebar connectors are installed before the concrete layer is applied on top. Wood-concrete layered beams with horizontal rebar connectors were tested in third-point loading flexural bending. An improvement on the previously conceived connection detail for a composite wood-concrete structural floor system was achieved. The new layout of the horizontal rebar connectors added more strength and higher composite efficiency for the beams tested. Further analysis is suggested to optimize the connection parameters in terms of spacing and number of connectors. Composite wood-concrete decks can attend a large demand for pedestrian and road bridges in rural areas, as well as residential and commercial slabs.
18
Kedlaya, Kiran S. "Local and global structure of connections on nonarchimedean curves." Compositio Mathematica 151, no. 6 (January 7, 2015): 1096–156. http://dx.doi.org/10.1112/s0010437x14007830.
Повний текст джерелаАнотація:
Consider a vector bundle with connection on a$p$-adic analytic curve in the sense of Berkovich. We collect some improvements and refinements of recent results on the structure of such connections, and on the convergence of local horizontal sections. This builds on work from the author’s 2010 book and on subsequent improvements by Baldassarri and by Poineau and Pulita. One key result exclusive to this paper is that the convergence polygon of a connection is locally constant around every type 4 point.
19
Shek, Poi Ngian, M. Md Tahir, Cher Siang Tan, and Arizu Sulaiman. "Experimental Investigation of Retrofitted Extended End-Plate Connections." Applied Mechanics and Materials 284-287 (January 2013): 1330–33. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.1330.
Повний текст джерелаАнотація:
A series of retrofitted extended end-plate connections have been tested experimentally and evaluated using the component method specified in Eurocode 3. The component method decomposed the end-plate connection into several components, including the tension zone, compression zone, vertical and horizontal shear zone that occurred at the bolt, end-plate, beam and column. Based on the theoretical model, the moment resistance and the initial stiffness of a connection can be predicted. Four experimental tests on the retrofitted extended end-plate connections have been conducted to verify the proposed design method. From the experiment tests, all moment resistance of the connections showed good agreement with theoretical predictions, which establish a reliable foundation to predict the moment resistance of the retrofitted end-plate connection. All initial stiffnesses calculated from theoretical predictions do not represent the actual behaviour of tested connection. All tested connections can be classified as partial strength based on EC 3: Part 1.8, in condition the welding capacity is at least 50% higher than the capacity calculated from the component method.
20
Wang, Gang. "Stress Impact Analysis of Steel Frame with Different Beam-Column Connection Mode." Applied Mechanics and Materials 275-277 (January 2013): 1028–33. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.1028.
Повний текст джерелаАнотація:
This paper uses the SAP2000 to establish different beam column connections of steel frame structure finite element model, comparative analysis of the beam column for the rigid connection, hinged, semi-rigid connections of steel frame structure, the dynamic characteristics of structure displacement and internal force influence. At the same time, the dynamic time-history analysis method for structural displacement supplementary checking, analysis of structural response to seismic wave degree．The results showed that：compared with rigid, the structure of semi-rigid connections to the larger natural period，and with the rotation stiffness decreases vibration period increases; Semi-rigid steel frame connection to reduce the resistance to push the layer stiffness，making the structure of the horizontal displacement increased．
21
BEJANCU, AUREL. "A LINEAR CONNECTION FOR BOTH SUB-RIEMANNIAN GEOMETRY AND NONHOLONOMIC MECHANICS (I)." International Journal of Geometric Methods in Modern Physics 08, no. 04 (June 2011): 725–52. http://dx.doi.org/10.1142/s0219887811005361.
Повний текст джерелаАнотація:
We study the geometry of a sub-Riemannian manifold (M, HM, VM, g), where HM and VM are the horizontal and vertical distribution respectively, and g is a Riemannian extension of the Riemannian metric on HM. First, without the assumption that HM and VM are orthogonal, we construct a sub- Riemannian connection ▽ on HM and prove some Bianchi identities for ▽. Then, we introduce the horizontal sectional curvature, prove a Schur theorem for sub-Riemannian geometry and find a class of sub-Riemannian manifolds of constant horizontal curvature. Finally, we define the horizontal Ricci tensor and scalar curvature, and some sub-Riemannian differential operators (gradient, divergence, Laplacian), extending some results from geometry to the sub-Riemannian setting.
22
Simić, Slobodan N. "On the sub-Riemannian geometry of contact Anosov flows." Journal of Topology and Analysis 08, no. 01 (February 23, 2016): 187–205. http://dx.doi.org/10.1142/s1793525316500072.
Повний текст джерелаАнотація:
We investigate certain natural connections between sub-Riemannian geometry and hyperbolic dynamical systems. In particular, we study dynamically defined horizontal distributions which split into two integrable ones and ask: how is the energy of a sub-Riemannian geodesic shared between its projections onto the integrable summands? We show that if the horizontal distribution is the sum of the strong stable and strong unstable distributions of a special type of a contact Anosov flow in three dimensions, then for any short enough sub-Riemannian geodesic connecting points on the same orbit of the Anosov flow, the energy of the geodesic is shared equally between its projections onto the stable and unstable bundles. The proof relies on a connection between the geodesic equations and the harmonic oscillator equation, and its explicit solution by the Jacobi elliptic functions. Using a different idea, we prove an analogous result in higher dimensions for the geodesic flow of a closed Riemannian manifold of constant negative curvature.
23
YOUSSEF, NABIL L., S. H. ABED та A. SOLEIMAN. "CONCURRENT π-VECTOR FIELDS AND ENERGY β-CHANGE". International Journal of Geometric Methods in Modern Physics 06, № 06 (вересень 2009): 1003–31. http://dx.doi.org/10.1142/s0219887809003904.
Повний текст джерелаАнотація:
The present paper deals with an intrinsic investigation of the notion of a concurrent π-vector field on the pullback bundle of a Finsler manifold (M, L). The effect of the existence of a concurrent π-vector field on some important special Finsler spaces is studied. An intrinsic investigation of a particular β-change, namely the energy β-change ([Formula: see text]with[Formula: see text]; [Formula: see text] being a concurrent π-vector field), is established. The relation between the two Barthel connections Γ and [Formula: see text], corresponding to this change, is found. This relation, together with the fact that the Cartan and the Barthel connections have the same horizontal and vertical projectors, enable us to study the energy β-change of the fundamental linear connection in Finsler geometry: the Cartan connection, the Berwald connection, the Chern connection, and the Hashiguchi connection. Moreover, the change of their curvature tensors is concluded. It should be pointed out that the present work is formulated in a prospective modern coordinate-free form.
24
SOLEIMAN, A. "PARALLEL π-VECTOR FIELDS AND ENERGY β-CHANGE". International Journal of Geometric Methods in Modern Physics 08, № 04 (червень 2011): 753–72. http://dx.doi.org/10.1142/s0219887811005373.
Повний текст джерелаАнотація:
The present paper deals with an intrinsic investigation of the notion of a parallel π-vector field on the pullback bundle of a Finsler manifold (M, L). The effect of the existence of a parallel π-vector field on some important special Finsler spaces is studied. An intrinsic investigation of a particular β-change, namely the energy β-change ([Formula: see text]with[Formula: see text] being a parallel π-vector field), is established. The relation between the two Barthel connections Γ and [Formula: see text], corresponding to this change, is found. This relation, together with the fact that the Cartan and the Barthel connections have the same horizontal and vertical projectors, enable us to study the energy β-change of the fundamental linear connection in Finsler geometry: The Cartan connection, the Berwald connection, the Chern connection and the Hashiguchi connection. Moreover, the change of their curvature tensors is concluded. It should be pointed out that the present work is formulated in a prospective modern coordinate-free form.
25
Gratton, R. G., V. D’Orazi, A. Bragaglia, E. Carretta, and S. Lucatello. "The connection between missing AGB stars and extended horizontal branches." Astronomy & Astrophysics 522 (November 2010): A77. http://dx.doi.org/10.1051/0004-6361/201015405.
Повний текст джерела
26
Mizerski, Krzysztof A., and Wladimir Lyra. "On the connection between the magneto-elliptic and magneto-rotational instabilities." Journal of Fluid Mechanics 698 (March 30, 2012): 358–73. http://dx.doi.org/10.1017/jfm.2012.95.
Повний текст джерелаАнотація:
AbstractIt has recently been suggested that the magneto-rotational instability (MRI) is a limiting case of the magneto-elliptic instability (MEI). This limit is obtained for horizontal modes in the presence of rotation and an external vertical magnetic field, when the aspect ratio of the elliptic streamlines tends to infinite. In this paper we unveil the link between these previously unconnected mechanisms, explaining both the MEI and the MRI as different manifestations of the same magneto-elliptic-rotational instability (MERI). The growth rates are found and the influence of the magnetic and rotational effects is explained, in particular the effect of the magnetic field on the range of negative Rossby numbers at which the horizontal instability is excited. Furthermore, we show how the horizontal rotational MEI in the rotating shear flow limit is linked to the MRI by the use of the local shearing box model, typically used in the study of accretion discs. In such a limit the growth rates of the two instability types coincide for any power-law-type background angular velocity radial profile with negative exponent corresponding to the value of the Rossby number of the rotating shear flow. The MRI requirement for instability is that the background angular velocity profile is a decreasing function of the distance from the centre of the disc, which corresponds to the horizontal rotational MEI requirement of negative Rossby numbers. Finally a physical interpretation of the horizontal instability, based on a balance between the strain, the Lorentz force and the Coriolis force, is given.
27
Ciesielczyk, Katarzyna, and Robert Studziński. "Experimental Investigation of the Failure Scenario of Various Connection Types between Thin-Walled Beam and Sandwich Panel." Materials 15, no. 18 (September 9, 2022): 6277. http://dx.doi.org/10.3390/ma15186277.
Повний текст джерелаАнотація:
The paper presents failure scenarios for various types of connections between a thin-walled beam and a sandwich panel. In addition to standard connections used in civil engineering applications, that is, self-drilling fasteners for sandwich panels, the study examined the use of bolts, blind rivets, and double-sided acrylic tape applied linearly and pointwise. The connections were subjected to the horizontal load applied with constant eccentricity with respect to the plane of the connection surface. This load arrangement simulates the behaviour of a free flange of the thin-walled beam in bending while lateral-torsional buckling occurs. In this way, the research covers the determination of the lateral stiffness of the thin-walled beam-free flange, while the other flange is connected to the sandwich panel using various connection systems.
28
Kim, Sun Woong, Wan Shin Park, Nam Young Eom, and Hyun Do Yun. "The Influence on Horizontal Ties of Steel Coupling Beams." Applied Mechanics and Materials 204-208 (October 2012): 1229–32. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.1229.
Повний текст джерелаАнотація:
Hybrid coupled shear wall system with steel coupling beams has known as the effective lateral load resisting system for tall buildings subjected to earthquake. This paper addresses the influence on horizontal ties of steel coupling beams in pseudo strain hardening cementitious composite (PSH2C) hybrid coupled shear wall. Test variables included the connection detail and types of material, concrete and PSH2C, in the connection region. The results show that Specimen PSH2C-SB and PSH2C-SBVRT exhibits a better stable behavior than Specimens HCWS-SB and HCWS-SBVRT.
29
Cheng, Bo, and Zhenyu Wu. "Investigation of Shear Stiffness of Spine Bracing Systems in Selective Pallet Racks." Open Construction and Building Technology Journal 9, no. 1 (May 29, 2015): 1–6. http://dx.doi.org/10.2174/1874836801509010001.
Повний текст джерелаАнотація:
This paper presents a general analysis on the shear stiffness of spine bracing systems of selective storage racks in the down-aisle direction. Unlike the architectural steel structure, the bearing capacity of bracing connection in the spine bracing systems of steel rack structure is weaker than that of bracing members. Firstly, destructive tests of spine bracing connection in single entry racks have been conducted. In the tests, a portion of column web around bolt holes is damaged due to the pull force of connecting bolts. Based on the experimental results, the finite element shell model of tested bracing connection is developed, and the emulation method is also used to analyze the deformation behavior of spine bracing connections in double entry racks. The calculating results indicate that, with better mechanical behavior and less local deformation, the tensile stiffness of bracing connection in double entry racks is much larger than that of bracing connection in single entry racks. From the trial calculation, the simplified models using elastic plastic beam elements are proposed. These simplified models can be adopted in the overall deformation analysis of selective pallet racks subjected to horizontal loading. Through the comparative analysis of single entry racks and double entry racks which have four bays and eight floors, the lateral deformation of double entry racks is considerably less than that of single entry racks, showing the large different effect of spine bracing systems on two rack lateral behavior.
30
Wang, Yimin, Xiuxing Sang, Kaiguang Shang, Yushuo Zhang, and Jinsan Ju. "Study on the Seismic Behavior of a Steel Plate–Concrete Composite Shear Wall with a Fishplate Connection." Buildings 12, no. 12 (December 16, 2022): 2245. http://dx.doi.org/10.3390/buildings12122245.
Повний текст джерелаАнотація:
The steel plate–concrete composite shear wall (SPCSW), having been widely applied to several super high-rise buildings, is currently regarded as a new type of lateral load-resisting structure. The SPCSW design does not consider the connection to the surrounding structure, normally envisaged as a buttweld connection, while the fishplate lap connection tends to be applied in construction. To explore the fishplate lap connection to achieve the performance standard of SPCSW, in this paper, an SPCSW with a fishplate connection is modeled using ABAQUS to investigate the hysteretic behavior under constant axial force and horizontal cyclic loads. Through the hysteresis curve and a load–displacement skeleton curve, the effects of fishplate thickness and lap length on its hysteretic behavior are studied. The results show that increasing the fishplate thickness contributes to a slight increase in the bearing capacity and energy dissipation and has little influence on stiffness degradation. When the fishplate thickness is more than half the steel plate thickness, the strength and energy dissipation of an SPCSW with a fishplate connection can reach the level of an SPCSW without a fishplate connection. The bearing capacity and stiffness of the SPCSW increase with the increase in lap length. When the lap length is greater than 50 mm, the strength, stiffness and energy dissipation capacity of an SPCSW with a fishplate connection are superior to those without fishplate connections. Finally, engineering suggestions on fishplate connections are put forward.
31
Sun, Chongfang, Shuting Liang, Xiaojun Zhu, Yamin Song, and Dongyue Wu. "Ductility Calculation of Prefabricated Shear Wall with Rabbet-Unbond Horizontal Connection." Advances in Civil Engineering 2018 (2018): 1–12. http://dx.doi.org/10.1155/2018/5197125.
Повний текст джерелаАнотація:
Considering the effect of confined end-zone and unbonded reinforcement, the yield curvature and ultimate curvature of rabbet-unbond horizontal connection (RHC) shear wall were calculated. Based on the curvature calculation result, the yield displacement and ultimate displacement were calculated using displacement superposition, which were compared with test values. The result showed that theoretical values were slightly smaller than test values; however, on the whole, both were in good agreement. The author studied the effect of unbonded reinforcement on yield displacement and ultimate displacement, and the result showed that the effect on ultimate displacement is more pronounced than yield displacement. The present work could be useful for the design of new prefabricated shear wall.
32
Murakoshi, Takayuki. "Horizontal synaptic connection in the superficial layer of rat visual cortex." Neuroscience Research Supplements 16 (January 1991): 127. http://dx.doi.org/10.1016/0921-8696(91)91017-m.
Повний текст джерела
33
Ibrahim, Ahmed, Dr Hilal Abd Elkader, and Prof Mohamed M. Husain. "Seismic Response of Slab Column Connection with Pyramid Shaped Drop Panel." International Journal of Engineering and Advanced Technology 11, no. 5 (June 30, 2022): 171–79. http://dx.doi.org/10.35940/ijeat.d2397.0611522.
Повний текст джерелаАнотація:
Both experimental and finite element analysis (FEA) was used to study the seismic response of reinforced concrete (RC) interior slab-column connection made with pyramid-shaped drop panel subjected to vertical and horizontal loads. The dimensions of the models at “¼ ” linear scale for laboratory testing and FE Analysis (FEA) are derived from rules for dimensions of column drops, given a prototype “9.60m” grid and a slab thickness of “320mm”. Lab specimens were tested with the drops (flat slab, rectangular and pyramid-shaped) facing up, with loadings (vertical down and horizontal in grid direction) applied by jacks towards the top of a central projecting “150mm” square column. One flat slab (“80mm” thick no drop), tested to failure under vertical load (80kN), provided values for setting variables used in the FEA. The remaining 5 lab specimens (1 flat and 1 each rectangular and pyramid-shaped 40mm and 30mm drop thicknesses), under a fixed vertical load (40kN), were tested to failure by increasing a moment at the column slab junction applied by a horizontal load to the column “500mm” above the slab. FEA results for the same conditions compared closely with experimental results. The pyramid-shaped drop models, with equal thickness to the rectangular drop models at the column faces (drops of “40mm” and “30mm”), exhibit similar maximum force resistances to the rectangular drop models. However, these resistances were achieved in the pyramid drops at higher maximum deflections – deflections being measured downwards at column centerline one half of slab thickness away from the face. A parametric study was conducted by FEA, at constant load, in vertical steps (10kN; 25kN 55kN), calculating deflections under increasing horizontal load. Calculations were made on the following definitions: Energy absorption is represented by the area under the deflection vs horizontal load curves; Ductility is the ratio of deflection at maximum to deflection at yield, and Stiffness and Overstrength factors are the slopes of the deflection load diagrams in the elastic and plastic zones respectively. Both drop type models exhibit significantly improved performance compared to the models without drops. The pyramid-shaped drop models exhibited improved energy absorption, ductility, and stiffness and overstrength compared to the rectangular drop models of the same column face thickness.
34
HONG, Won-Kee, Gyeongju KIM, Chaeyeon LIM, and Sunkuk KIM. "DEVELOPMENT OF A STEEL-GUIDE CONNECTION METHOD FOR COMPOSITE PRECAST CONCRETE COMPONENTS." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 23, no. 1 (July 1, 2016): 59–66. http://dx.doi.org/10.3846/13923730.2014.975740.
Повний текст джерелаАнотація:
Green Frame is a column-beam structure formed by connecting a composite precast concrete beam with a steel connection on the column side. Similar to steel frame construction, the green columns cover 3 stories per unit, and generate vertical and horizontal eccentricities due to construction errors and the gravitational loads of beams. Such eccentricities make it difficult to install the upper floor beams and adjacent frames. This problem not only results in decreased productivity, but also in time delays and cost overrun. The objective of this study is to develop a new steel-guide connection method for composite precast concrete (CPC) components after analysing the erection process and structural mechanism to resolve eccentricity issues. The connection mechanism developed in this study resolves these eccentricities and promotes efficient, accurate, and safe construction.
35
Dong, Zhenhua, Jinquan Zhang, Shoushan Cheng, and Pengfei Li. "Numerical Simulation of Mechanical Properties of Series System with Bearing and Pier Under Lateral Load." Baltic Journal of Road and Bridge Engineering 16, no. 1 (March 29, 2021): 91–117. http://dx.doi.org/10.7250/bjrbe.2021-16.517.
Повний текст джерелаАнотація:
The local series system with typical common plate rubber support/pier in highway reinforced concrete girder bridge is the object of the current research. The finite element numerical simulation method is used to study sensitive parameters – the mechanical properties of the series system under the horizontal load. The simulated results show that the interface bonding strength between the bearing and adjacent structure is reduced; the equivalent shear deformation and the horizontal force of bearing under horizontal load change insignificantly with the increase of horizontal displacement. However, the total shear deformation and equivalent shear deformation increase with the increase of the axial compression ratio. In addition, the top horizontal force and displacement of the pier significantly decrease with reduction of the connection strength at both ends of the bearing. Therefore, adjusting the axial compression ratio of the pier and interfacial connection mode can obviously affect the mechanical properties of the support and adjacent structure, even the failure mode of the local structure. This approach can help estimate the mechanical properties of the existing bridge and determine the reasonable maintenance plan.
36
Kim, Byeongil, and Jong-Yun Yoon. "Structural Optimization of a Circular Symmetric Threaded Connection System Based on the Effect of the Upper Stabbing Flank Corner Radius." Symmetry 14, no. 12 (December 2, 2022): 2553. http://dx.doi.org/10.3390/sym14122553.
Повний текст джерелаАнотація:
In order to boost shale gas drilling efficiency, oil and gas exploration and drilling distances have risen along with the number of horizontal definitions and directions. As a result, the joints of oil wells and core gas pipes are under continual stress and compression, internal and external pressures, and extreme bending stresses. This will negatively impact the drilling system’s sustainability and the performance requirements are therefore reinforced. Good thread design is crucial because premium threaded connections are typically employed in joints, and the construction of reliable premium connections to external limitations is closely related to the choice of pertinent parameters as optimal values. In this article, new premium connection systems will be created and constructed that can show good vibration and durability under such stressful conditions. The amount of von Mises stress that is received from the threaded connection depends on how each parameter is changed. In particular, the values of the “upper stabbing flank corner radius” were used to examine the von Mises stress variations in the entire structure. An optimized design for the premium connection system is proposed with the best value of upper stabbing flank corner radius according to minimized stress on the teeth of the premium connection against compressive forces. The study’s findings suggest that it is feasible to create a premium connection that can lower stress following the genuine demand of the industry.
37
BEJANCU, AUREL. "FIELD EQUATIONS FOR SPACE–TIME–MATTER THEORY." International Journal of Geometric Methods in Modern Physics 10, no. 09 (August 30, 2013): 1350038. http://dx.doi.org/10.1142/s0219887813500382.
Повний текст джерелаАнотація:
In the present paper we obtain, in a covariant form, and in their full generality, the field equations in a relativistic general Kaluza–Klein space. This is done by using the Riemannian horizontal connection defined in [3], and some 4D horizontal tensor fields, as for instance: horizontal Ricci tensor, horizontal Einstein gravitational tensor field, horizontal electromagnetic energy–momentum tensor field, etc. Also, we present some inter-relations between STM theory and brane-world theory. This enables us to introduce in brane theory some electromagnetic potentials constructed by means of the warp function.
38
Cheng, Junfeng, Xiaoyong Luo, Laixiu Cheng, Qian Cheng, and Linsong Chen. "Experimental Study on Seismic Behavior of PC Walls with Alveolar-Type Horizontal Joint under Pseudo-Static Loading." Materials 15, no. 6 (March 20, 2022): 2301. http://dx.doi.org/10.3390/ma15062301.
Повний текст джерелаАнотація:
There are many horizontal joints on precast concrete (PC) wall panel structures, which certainly has a significant impact on the seismic behavior of structures. This paper proposes a novel alveolar-type horizontal joint, which has advantages of convenient and rapid assembly. Six precast concrete wall specimens with alveolar-type joints were designed and constructed, and they were weakly connected by spliced rebars anchored into grouted sleeves to meet the requirements of structural performance. The pseudo-static loading tests on these specimens were conducted to investigate the effects of influencing factors, such as the axial compression ratio, the thickness of wall (interface contact area), and the addition of a vertical grouted sleeve connection at the horizontal joint, on the seismic performance of PC walls. Analyses and comparisons were conducted in terms of the cracking propagation pattern, failure modes, force–displacement hysteretic curves, skeleton curves, bearing capacity, ductility factors, and energy dissipation of PC walls. It was concluded that the axial compression ratio and adding grouted sleeve connection had a significant influence on the cracking mode of PC walls, whereas the impact of the wall thickness was slight. The shear capacity and energy dissipation capacity of specimen dramatically enhanced by increasing the axial compression ratio or adding grouted sleeve connection. The PC wall exhibits good ductility after adding the vertical grouted sleeve connection at a horizontal joint. However, the ductility factor increases firstly and then decreases in the enhancement of the axial compression ratio. The reduction in wall thickness has remarkable impacts on the shear strength and energy dissipation capacity of specimens, but the influences on ductility were not significant. The prediction method for calculating the shear capacity of PC walls with alveolar-type horizontal joints was proposed based on the experimental data, and these calculated results are in good agreement with the experimental results.
39
Polyakova, K. "Maps generating normals on a manifold." Differential Geometry of Manifolds of Figures, no. 50 (2019): 110–25. http://dx.doi.org/10.5922/0321-4796-2019-50-13.
Повний текст джерелаАнотація:
The first- and second-order canonical forms are considered on a smooth m-manifold. The approach connected with coordinate expressions of basic and fiber forms, and first- and second-order tangent vectors on a manifold is implemented. It is shown that the basic first- and secondorder tangent vectors are first- and second-order Pfaffian (generalized) differentiation operators of functions set on a manifold. Normals on a manifold are considered. Differentials of the basic first-order (second-order) tangent vectors are linear maps from the first-order tangent space to the second-order (third-order) tangent space. Differentials of the basic first-order tangent vectors (basic vectors of the first-order normal) set a map which takes a first-order tangent vector into the second-order normal for the first-order tangent space of (into the third-order normal for second-order tangent space). The map given by differentials of the basic first-order tangent vectors takes all tangent vectors to the vectors of the second-order normal. Such splitting the osculating space in the direct sum of the first-order tangent space and second-order normal defines the simplest (canonical) affine connection which horizontal subspace is the indicated normal. This connection is flat and symmetric. The second-order normal is the horizontal subspace for this connection. Derivatives of some basic vectors in the direction of other basic vectors are equal to values of differentials of the first vectors on the second vectors, and the order of differentials is equal to the order of vectors along which differentiation is made. The maps set by differentials of basic vectors of r-order normal for (r – 1)-order tangent space take the basic first-order tangent vectors to the basic vectors of (r + 1)-order normal for r-order tangent space. Horizontal vectors for the simplest second-order connection are constructed. Second-order curvature and torsion tensors vanish in this connection. For horizontal vectors of the simplest second-order connection there is the decomposition by means of the basic vectors of the secondand third-order normals.
40
Holmes, Niall, Darran Kierans, and Patrick Crean. "An Alternative Stiffening Method for Rigid CHS L-Joints." Journal of Structures 2016 (June 30, 2016): 1–11. http://dx.doi.org/10.1155/2016/4856059.
Повний текст джерелаАнотація:
The paper presents a new method of stiffening CHS L-joints and compares it against current stiffened and unstiffened moment connections. The method is derived from studying the failure modes of existing methods, typically local buckling and ovalisation of the section. Unstiffened right-angled CHS connections have been shown to be weak due to local buckling and ovalisation. Stiffing plates placed across the joint can increase the moment capacity of the section by preventing ovalisation of the section but is architecturally unsightly. An alternative approach, where a stiffening plate welded vertically inside both the column and beam, outperformed the unstiffened frame plate in terms of reduced ovalisation and increased load capacity. It was also found to perform better than the stiffened connection in terms of both vertical and horizontal deflection. However, more research is required to ensure a fully restrained connection to satisfy codes of practice and constructible.
41
Dawidek, J., and B. Ferencz. "Water balance of selected floodplain lake basins in the Middle Bug River valley." Hydrology and Earth System Sciences 18, no. 4 (April 11, 2014): 1457–65. http://dx.doi.org/10.5194/hess-18-1457-2014.
Повний текст джерелаАнотація:
Abstract. This study is the first attempt in the literature on the subject of comparing water balance components for floodplain lake basins, depending on the type of a lake connection to the parent river. Research was carried out in the Bug River valley in 2007–2011 water years. Four types of connections were distinguished in the area under study. Simple water balance equation could only be used with regard to the lakes connected to the main river via the upstream crevasses. Detailed and individual water balance equations were developed with reference to the other types of lakes. Water gains and losses varied significantly in the lakes under study. Values of horizontal water balance components (inflow and outflow) of the floodplain lake in Wola Uhruska considerably prevailed over the vertical ones (precipitation and evaporation). Inflow of the Bug River waters was diverse during the time period under study and amounted from 600 000 to 2 200 000 m3 yr−1. Volumes of precipitation and evaporation were rather stable and amounted to approx. 30 000 m3 yr−1. The lowest disparity between horizontal and vertical water balance components was observed in the inter-levee lake. Both upstream inflow of rivers water and outflow from the lake (ranged from 0 in 2008 to 35 000 m3 yr−1 in 2009) were usually an order of magnitude higher than precipitation and evaporation from the lake surface (700–800 m3 yr−1). Study showed that the values and the proportion between aforementioned vertical and horizontal water balance elements were determined by the type of a lake connection to the Bug River. Storage volume showed no relationship to the type of connection, but resulted from individual features of the lakes (location within the valley, precipitation and evaporation volume, difference between water inflow and outflow).
42
Wang, Peng, Jun Feng Xie, You Cheng Zheng, Fang Ting Hu, and Nan Ji. "Integrity Analysis of Casing Premium Connection under High Compression Load." Materials Science Forum 1035 (June 22, 2021): 447–51. http://dx.doi.org/10.4028/www.scientific.net/msf.1035.447.
Повний текст джерелаАнотація:
With the increasingly harsh conditions of complex oil and gas wells such as high-temperature and high-pressure deep wells and long-distance horizontal well, the integrity of casing string puts forward higher requirements for compression performance of premium thread connections. The requirements of high compression resistance of connection is complicated, including ensuring the integrity of structure and sealability for thread at the same time under high compression load being equal to the bearing capacity of casing body, and considering the structural fatigue, environmental fracture and seal failure caused by the weakening of thread bearing performance under cyclic load. Based on the failure cases of some casing connections, laboratory tests and finite element analysis results, this paper discusses the key technical points in the above mentioned problems, and provides the suggestions for the performance optimization of high-performance casing premium connections based on failure prevention.
43
Sun, Yanyan, Zhenbo Wang, and Jing Xu. "Research on Seismic Performance of an Innovative Upper-Lower Half-Story Precast Shear Wall." Advances in Civil Engineering 2021 (May 19, 2021): 1–15. http://dx.doi.org/10.1155/2021/5519575.
Повний текст джерелаАнотація:
An innovative precast connection (the precast connection installed in the middle of the shear wall) was proposed for the shear wall. To verify the effectiveness of the proposed precast connection, two cast-in-situ shear walls (RCW1 and RCW2) and three precast shear walls (PCW1, PCW2, and PCW3) were manufactured and investigated. The construction joints were inserted in the bottom and the middle for RCW1 and RCW2; and the structural glue horizontal connection, structural glue cogged connection, and cast-in-situ plug grouting connection were utilized for PCW1, PCW2, and PCW3, respectively. The failure mode, loading capacity, ductility, stiffness degradation, and energy dissipation of specimens were analyzed under the horizontal low-frequency cycled loading. Simultaneously, a numerical simulation was carried out on the ABAQUS software, and simulation results were consistent with experimental results. The result showed that the moment-shear failure occurred in all the specimens except PCW1; the bottoms of PCW2 and PCW3 were still vulnerable regions. The bearing capacity and the ductility of RCW2 were improved to different degrees by installing the construction joint in the middle of the shear wall. Specifically, the structural glue cogged connection and the cast-in-situ plug grouting connection have no obvious effect on the reduction of bearing capacity but can improve the ductility of the specimen; the stiffness degradation and energy dissipation of RCW1, RCW2, PCW2, and PCW3 were basically the same.
44
Lee, Jin Seop, Yeon Su Lee, and Tae Keun Oh. "Effect of Horizontal Connection and Slope on Buckling Characteristics of Single Pipe." Journal of the Korean Society of Safety 30, no. 2 (April 30, 2015): 48–55. http://dx.doi.org/10.14346/jkosos.2015.30.2.48.
Повний текст джерела
45
Fox, Steven R., and Reinhold M. Schuster. "Strength of wind load bearing wall stud-to-track connections." Canadian Journal of Civil Engineering 29, no. 5 (October 1, 2002): 777–86. http://dx.doi.org/10.1139/l02-074.
Повний текст джерелаАнотація:
Cold-formed steel structural members are often used in building construction, with a common application being wind load bearing steel studs. The studs frame into horizontal steel track members at the top and bottom of the wall assembly, with the stud-to-track connection typically being made with self-drilling screws or welds. The design of the wall stud must include a check of the web crippling capacity at the end reactions. The type of end bearing that exists in these stud-to-track connections is not explicitly addressed by the current North American cold-formed steel design documents. Reported in this paper are the results and analysis of a collection of end-one-flange web crippling tests of common stud-to-track connections. The tests show that there are two failure modes: web crippling of the stud, and punch-through of the track flange. Design expressions are proposed to predict the capacity of the connection based on these two modes of failure. The effects of increasing the gap between the stud and the track and the effects of missing screws in the stud-to-track connection are also discussed.Key words: cold-formed steel, steel studs, structural design, connections, web crippling.
46
Ishikawa, Koichiro. "Earthquake Response Control of Double-Layer Truss Walls by means of Innovative Fuse Connections." Advances in Civil Engineering 2018 (August 15, 2018): 1–9. http://dx.doi.org/10.1155/2018/1425672.
Повний текст джерелаАнотація:
This study deals with partial cylindrical truss walls equipped with damper connections due to horizontal earthquake motions. The damper connection consists of an aluminum ball joint, an aluminum hub, and a steel bolt. A ductile elongation of the steel bolt due to a tensile stress is expected by avoiding the brittle collapse. The study proposes a fuse-type connection by means of yield of the steel bolt due to tension stress realized by the ductile failure collapse mechanism of the wall-type spatial structure. The proposed truss wall with the fuse-type connection can realize a deformation of nodes within the restriction for avoiding a nonstructural member damage. It is confirmed in the dynamic elastoplastic analysis that the control of the dynamic collapse mechanism such as the steel bolt elongation can avoid a brittle collapse mechanism such as a chain of member buckling. The evaluation method is also proposed by means of the limit displacement considering a ductility factor of the steel bolt within 2.0.
47
Lucas, Dan, C. P. Caulfield, and Rich R. Kerswell. "Layer formation in horizontally forced stratified turbulence: connecting exact coherent structures to linear instabilities." Journal of Fluid Mechanics 832 (October 26, 2017): 409–37. http://dx.doi.org/10.1017/jfm.2017.661.
Повний текст джерелаАнотація:
We consider turbulence in a stratified ‘Kolmogorov’ flow, driven by horizontal shear in the form of sinusoidal body forcing in the presence of an imposed background linear stable stratification in the third direction. This flow configuration allows the controlled investigation of the formation of coherent structures, which here organise the flow into horizontal layers by inclining the background shear as the strength of the stratification is increased. By numerically converging exact steady states from direct numerical simulations of chaotic flow, we show, for the first time, a robust connection between linear theory predicting instabilities from infinitesimal perturbations to the robust finite-amplitude nonlinear layered state observed in the turbulence. We investigate how the observed vertical length scales are related to the primary linear instabilities and compare to previously considered examples of shear instability leading to layer formation in other horizontally sheared flows.
48
Cascardi, Alessio, Marianovella Leone, and Maria Antonietta Aiello. "Shear Behavior of Multi Leafs Masonry Panels with Transversal Connections." Key Engineering Materials 817 (August 2019): 359–64. http://dx.doi.org/10.4028/www.scientific.net/kem.817.359.
Повний текст джерелаАнотація:
The historical masonry buildings are generally characterized by a load-bearing structure constituted by walls that should resist to both gravitational and horizontal actions. In several existing constructions, masonry panels are made by two external leafs with higher mechanical properties and an inner core with very low, or even negligible, mechanical characteristics. In some cases the connection between the external leafs was provided by inserting a certain number of bricks in the transversal direction (namely diatones); while sometimes, the leafs were totally independent. Often in the case of horizontal forces, as those due to earthquakes, the multi-leafs walls collapse has been observed, because of the leafs separation. Nowadays, there are different connecting systems available in the market and utilized to guarantee the collaboration of the external leafs, in order to finally improve the wall bearing capacity.In this scenario, the present paper is aimed to investigate the shear strength of small-scale multi-leafs panels, coupled with different types of connector, such as: diatones, L-shaped glass; glass and steel rope and helical steel bars. In plane shear tests have been performed in order to evaluate the shear stress-strain relationship. The results are herein reported and discussed, aiming to determine the effectiveness of the different connections systems.
49
Sun, Chongfang, and Zhiqiang Zhao. "Seismic Performance Evaluation of Prefabricated Shear Wall Structure with Rabbet-Unbonded Horizontal Connection." Advances in Civil Engineering 2022 (March 25, 2022): 1–16. http://dx.doi.org/10.1155/2022/8898079.
Повний текст джерелаАнотація:
This paper is concerned about seismic performance evaluation of precast shear wall structure with Rabbet-unbonded Horizontal Connection (RHC). RHC is composed of rabbets and unbonded rebar segments. The rabbets are used to improve the shear capacity and prevent slippage of connection, and the unbonded rebar segments are used to improve the ductility and energy dissipation. The constitutive relation of unbonded region is put forward and verified, which is applied in RHC shear wall structure model. The pushover analysis, capacity spectrum analysis and seismic performance evaluation of RHC shear wall structure are performed, which are compared with that of conventional connection shear wall structure and cast-in-place shear wall structure. The result shows that RHC shear wall structure reaches basic seismic fortification target of “no damage in small earthquake, repairable in moderate earthquake, no collapse in severe earthquake,” and basically reaches the seismic performance of cast-in-situ shear wall structure. Finally the effect of unbonded length and unbonded level on storey drift and interlayer drift angle are analyzed and the design proposal is put forward.
50
Kassem, Riyam, Amar Samara, Ameer Biadsee, Shchada Masarwa, Tarek Mtanis, and Zeev Ormianer. "A Comparative Evaluation of the Strain Transmitted through Prostheses on Implants with Two Different Macro-Structures and Connection during Insertion and Loading Phase: An In Vitro Study." Materials 15, no. 14 (July 16, 2022): 4954. http://dx.doi.org/10.3390/ma15144954.
Повний текст джерелаАнотація:
Background: The purpose of this study was to measure and compare the strain levels in the peri-implant bone as generated by the blade-like implant (BLI) and the screw-type implant (STI) with two different internal connections (hexagonal and conical) and with a 1:1 and 2:1 crown/implant (C/I) ratio. Methods: The implants (BLI and STI) were placed into sawbones according to the manufacturer’s protocol. Two strain gauges, horizontal and vertical to the implant axis, were placed around each implant on the bone surface 1 mm from the cervical part. Each implant was loaded by a material testing machine at a force of 100 N. Micro-strains (με) generated in the surrounding bone were measured by a strain gauge and recorded. Results: Recorded micro-strains were not significant in both the insertion and loading phases (p < 0.0625). The average recorded micro-strain values were lower in the horizontal dimension of STI with hexagonal connection when the C/I ratio was 2:1 compared with BLI, 210 με and 443 με, respectively. Conclusion: Within the limitations of this study, implant design, implant-abutment connection and C/I ratio did not influence strain values in bone and there is no statistically significant effect of these parameters on bone.