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Journal articles on the topic 'Connections'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 March 2023

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1

Nurfitriani, Cut Devy, and Abd Qohar. "ANALISIS KEMAMPUAN KONEKSI MATEMATIS SISWA SMP DALAM MENYELESAIKAN MASALAH KONTEKSTUAL HIMPUNAN." Jurnal Kajian Pembelajaran Matematika 5, no. 2 (October 30, 2021): 38. http://dx.doi.org/10.17977/um076v5i22021p38-45.

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Mathematical connections are connecting mathematical concepts and mathematical concepts with other sciences and problems of everyday life. Mathematical contextual problems can be used to view and build students' mathematical connections. The purpose of this study was to describe how the mathematical connection abilities of junior high school students when solving contextual problems on set material. The type of research used is qualitative descriptive research. Research data obtained through mathematical connection tests and interviews. Analysis of mathematical connection ability is divided into modeling connections, concepts, representations, and procedures. The results of this study indicate that high mathematical ability students make modeling connections by making mathematical models, conceptual connections by connecting many members of each set, and procedural connections by operating algebraic forms correctly, representation connections are not carried out because students rarely use Venn diagrams. Students who are mathematically capable are not making modeling connections, concept connections, representation connections, and procedural connections. Students with low mathematical ability do not make modeling connections, concept connections, representation connections and procedural connections
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2

Lee, Myung Jae. "Improvement of Shear Connection Design Procedure using Connections Standardization Database." Journal of Korean Society of Steel Construction 26, no. 2 (2014): 81. http://dx.doi.org/10.7781/kjoss.2014.26.2.081.

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3

Clark, Eric, and Thomas L. Clark. "Isolating connections – connecting isolations." Geografiska Annaler: Series B, Human Geography 91, no. 4 (December 2009): 311–23. http://dx.doi.org/10.1111/j.1468-0467.2009.00324.x.

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4

Song, Guo Hua, Dong Wei Wang, and Bing Kang Liu. "Study on Seismic Behavior of Vertical Connection in Prefabricated Reinforced Concrete Structures." Advanced Materials Research 250-253 (May 2011): 1385–94. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.1385.

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The paper attempts to research the seismic behavior and mechanical mechanisms under repeated low-cycle loading of vertical connections in prefabricated reinforced concrete structures. Eighteen specimens were designed and tested, the test process and the mechanical mechanisms are studied, the seismic behavior of connections is analyzed, and the shear resistance formulas are proposed. The theoretical values based on proposed formulas are good agreement with test results. Under repeated loading, the shear resistance decreases, the connection ductility increases with connecting bar, but decreases with connection width. However, all the connections fail crisply with poor ductility. At sudden-cracking, the shear resistance increases with connecting bar, but changes nonlinearly with connection width. The resistance is composed of attributions of mechanism of diagonal-compressive column (MDCC) and mechanism of compressive friction action (MCFA). After sudden-cracking, the shear resistance is provided by weakened MDCC and dowel action of connecting bars (DACB). It increases with connecting bar and connection width.
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5

Strzyz, Paulina. "Connections, connections, connections." Nature Reviews Molecular Cell Biology 18, no. 3 (February 21, 2017): 139. http://dx.doi.org/10.1038/nrm.2017.14.

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Ross, Carolyn Tuten. "Curriculum Connections: The English-Economics Connection." Kappa Delta Pi Record 33, no. 4 (July 1997): 153. http://dx.doi.org/10.1080/00228958.1997.10532011.

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7

Binh, T. Q. "Cartan-type connections and connection sequences." Publicationes Mathematicae Debrecen 35, no. 3-4 (July 1, 2022): 221–29. http://dx.doi.org/10.5486/pmd.1988.35.3-4.05.

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8

Fatimah, Ai Tusi. "Koneksi Matematis Siswa pada Tugas Matematis Berbasis Hasil Pertanian: Konteks, Konsep, dan Prosedur Matematis." Jurnal Elemen 7, no. 2 (July 21, 2021): 295–309. http://dx.doi.org/10.29408/jel.v7i2.3176.

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The mathematical connection is a crucial ability possessed by vocational high school students in solving problems by their field of expertise. Agriculture is a field of expertise that requires a lot of mathematical connection skills to solve various problems. Increasing the ability of students' mathematical connections can be facilitated by the teacher by constructing mathematical tasks in the agricultural sector. This qualitative research using the case study method describes the construction of mathematical tasks based on agricultural products and the mathematical connection ability of students in solving the task. Mathematical task construction is carried out by integrating agricultural product contexts and mathematical concepts. The mathematical task was used in Grade X Agribusiness Expertise students of Agricultural Product Processing. Data retrieval of students' mathematical connection abilities was carried out through tests, observation results, answer sheets, and interviews that focused on connecting contexts with mathematical concepts, connections between mathematical concepts, and connections to mathematical procedures. The results of the student data analysis showed that the ability of mathematical connections was hampered by the ability of the connection between mathematical concepts. It is necessary to increase student's mathematical connections by constructing mathematical tasks with various mathematical concepts.
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9

MARATSOS, M. P. "Problems of Connectionism: Connections and Symbols." Science 242, no. 4883 (December 2, 1988): 1316–17. http://dx.doi.org/10.1126/science.242.4883.1316.

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10

Ma, Hong Wei, and Michael C. H. Yam. "Experimental Study on a Beam-to-Column Connection Using Shape Memory Alloy." Advanced Materials Research 374-377 (October 2011): 2176–79. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.2176.

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For ductile beam-to-column connectiosn in steel frame, beam local buckling is difficult and very costly to repair in any post-disaster reconstruction. Shape memory alloys (SMAs) in their austenite states have the ability to recover their original shape after experiencing large deformations. Steel connections retrofitted using SMAs can be endowed with intelligent characteristics. This paper investigates extended end-plate connections using long shank SMA bolts. The SMA connection is designed using a new methodology of avoiding beam local buckling and adopting the strong end-plate. The connection deformations are supposed to concentrate on the SMA bolts. In order to study the seismic behaviour of the connections, quasi-static tests were conducted on both the SMA connection specimens. The test results indicate that the connection can show high deformation capacity with the maximum interstory drift angles beyond 0.02 rad. However, the beam was remained elastic during test and the deformations of the SMA connection were recoverable upon unloading. The load-drift hysteresis loops are flag-shaped for the SMA connection. This indicates that the connection has moderate energy dissipating capacity.
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11

Kennaway, Joel, Ali Rajabipour, Dongsheng Huang, Milad Bazli, Siyuan Tang, Junkai Wang, Hayden Zanker, and Fangming Su. "Connection Confinement of Bolted Fibre-Reinforced Polymer Bamboo Composite." Polymers 14, no. 10 (May 17, 2022): 2051. http://dx.doi.org/10.3390/polym14102051.

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Parallel strand bamboo is a composite material that demonstrates high strength and low variability compared to other timber materials. However, its use in bolted connections is limited by a tendency to fail in shear-out mode. One promising technique to prevent failure is the method of confinement, whereby the composite connection is confined laterally, inducing a compressive force perpendicular to the composite fibres, which increases the shear strength in the loading process. This paper investigates the confinement method and its effect on parallel strand bamboo connections’ strength and failure mechanisms through experimental tests and ANSYS simulation methods. It was discovered that bolted connection confinement reduces the propensity of shear-out failure by counteracting shear stresses. A comparison of graphical results revealed that confinement increased the ultimate tensile capacity of parallel strand bamboo bolted connections by up to 26%. Confinement also improved the consistency of the connection’s mechanical properties throughout the loading process. These findings assist in refining and optimising practical applications of parallel strand bamboo connections by using the method of connection confinement.
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12

Mortari, Daniele. "The Theory of Connections: Connecting Points." Mathematics 5, no. 4 (November 1, 2017): 57. http://dx.doi.org/10.3390/math5040057.

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13

Han, Rui Long, Wei Xing Shi, and Dan Wei. "Behavior of Grout Sleeve Connections under Eccentric Cyclic Load." Advanced Materials Research 368-373 (October 2011): 48–52. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.48.

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The grout sleeve connection offers important complement to traditional steel tube connections and is increasingly applied in structures. To acquire the connection’s behavior under eccentric cyclic load, study and tests were conducted at Tongji University on two specific types of grout sleeve connections which were identical except for some construction measures. The load-strain curve, load-deformation curve, elastic limit bearing capacity and stress-strain distribution of each specimen are obtained as results. Those results indicate that this kind of connection has good bearing capacity and stiffness, and those behaviors can be efficiently improved through optimizing its construction measures.
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14

Zheng, Shu Ling, Su Qin Tang, and Rajshekhar Sunderraman. "Combining Multiple Ontologies Using Ε-Connections." Applied Mechanics and Materials 241-244 (December 2012): 2601–5. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.2601.

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Ontology reusing has been extensively researched. Ontology connection is one of the ways which can reuse ontology that has been studied lately. Ε-connections and bridge rules are two ways of connecting ontologies. Based on these two methods, and using the ontology editor tool SWOOP, the link properties of the classes from different ontologies can be defined. Using these link properties, the multiple ontologies we are connecting can be reused effectively.
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15

Nelson, R. J. "Connections among connections." Behavioral and Brain Sciences 11, no. 1 (March 1988): 45–46. http://dx.doi.org/10.1017/s0140525x00052663.

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16

Shaheen, Mohamed A., Mohamed Ahmed Galal, Lee S. Cunningham, and Andrew S. J. Foster. "New Technique to Improve the Ductility of Steel Beam to Column Bolted Connections: A Numerical Investigation." CivilEng 2, no. 4 (October 22, 2021): 929–42. http://dx.doi.org/10.3390/civileng2040050.

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A novel method to improve the robustness of steel end plate connections is presented in this paper. Existing commonly adopted techniques alter the stiffness of the beam or the end plate to improve the connection’s robustness. In this study, the robustness is enhanced by improving the contribution of the bolts to the rotational capacity of connections; the higher the bolts’ elongation, the higher the rotational capacity that can be achieved. However, the brittleness of the bolt material, combined with its small length, results in negligible elongation. Alternatively, the load path between the end plate and the bolts can be interrupted with a ductile element to achieve the required elongation. This can be achieved by inserting a steel sleeve with a designated length, thickness, and wall curvature between the end plate and the washer. The proposed sleeve should be designed so that its ultimate capacity is less than the force in the bolt at failure; accordingly, the sleeve develops a severe bending deformation before the failure of any connection components. Using a validated finite element model, end plate connections with various parameters are numerically investigated to understand the performance of the sleeve device. The proposed system substantially enhances the rotational capacity of the connections, ranging between 1.37 and 2.46 times that of the standard connection. It is also concluded that the sleeved connections exhibit a consistent elastic response with the standard connections, indicating the proposed system is compatible with codified elastic design approaches without modification. Furthermore, for a specific connection, various ductile responses can be achieved without altering the connection capacity nor configuration.
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17

Van Wittenberghe, Jeroen, Patrick De Baets, Wim De Waele, Timothy Galle, Tien Thanh Bui, and Guido De Roeck. "Design characteristics that improve the fatigue life of threaded pipe connections." International Journal Sustainable Construction & Design 2, no. 2 (November 6, 2011): 334–41. http://dx.doi.org/10.21825/scad.v2i2.20530.

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Threaded pipe connections are commonly used to connect risers, tendons, drill pipes and wellcasing strings. In these applications fatigue resistance plays an important role. A large variety of patenteddesign features exist, all claiming to improve the connection’s fatigue life. However, patent documents onlycontain claims and numerical or experimental data about these connection’s performance is generally notpublished. This makes it hard to make a quantitative comparison between different designs. In this study anoverview is given of fatigue resistant threaded connections. Two major methods to improve the fatigue lifeof a connection were identified. First of all, local stress concentrations can be reduced by optimizing thegeometry of the threads. Second the global shape of the connection can be optimized to obtain a moreuniform load distribution.Using a parametric finite element model, different designs were compared. The connections were modelledby a 2D axisymmetric geometry with non-linear material properties and elaborate contact conditions.Selected designs have been subjected to experimental tests in a four-point bending fatigue setup. Theexperimental tests serve as a validation for the results of the numerical simulations. It was found that themultiaxial stress distribution at the thread roots is the defining factor for the fatigue life of the connection.Nevertheless, these stresses can be changed by the global geometry of the connection. It can beconcluded that the fatigue life of threaded connections is determined by a combination of global and localaspects which should both be analysed for fatigue life calculations.
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18

El-Ghazaly, Hany Ahmed, and Heyad Saud Al-Zamel. "An innovative detail for precast concrete beam–column moment connections." Canadian Journal of Civil Engineering 18, no. 4 (August 1, 1991): 690–710. http://dx.doi.org/10.1139/l91-084.

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A new detail is introduced for precast concrete beam-to-column moment connections. The detail consists of a connecting steel frame used to mechanically connect the threaded end protruding reinforcing bars from beam and column. The connection detail is made convenient to assemble where the erection method resembles that of steel construction. No idle crane time is necessary, since the connecting steel frame is designed to carry the beam's own weight. When the connection construction is completed, the joint functions as a moment resisting hard connection. The experimental testing program involved testing of twelve full-scale specimens in addition to a pilot test. Of the twelve tests seven are flexural tests, three are shear tests, and two are monolithic flexural tests for comparison. Modes of failure in the flexural tests were mainly due to rupture of tension reinforcement; however, premature slippage of the rebars may occur under certain conditions, but could be conveniently prevented. In the shear tests, diagonal tension crack failure predominated. If the connection parameters are properly selected, the connection will be capable of developing the beam's full plastic moment and undergo sufficient rotation before collapse. Key words: precast concrete, moment connections, connecting steel frame, stiffness, strength, ductility.
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19

Scannell, Jack W., Simon Grant, Bertram R. Payne, and Roland Baddeley. "On variability in the density of corticocortical and thalamocortical connections." Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences 355, no. 1393 (January 29, 2000): 21–35. http://dx.doi.org/10.1098/rstb.2000.0547.

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Variability is an important but neglected aspect of connectional neuroanatomy. The quantitative density of the ‘same’ corticocortical or thalamocortical connection may vary by over two orders of magnitude between different injections of the same tracer. At present, however, the frequency distribution of connection densities is unknown. Therefore, it is unclear what kind of sampling strategies or statistical methods are appropriate for quantitative studies of connectivity. Nor is it clear if the measured variability represents differences between subjects, or if it is simply a consequence of intra–individual differences resulting from experimental technique and the exact placement of tracers relative to local spatial and laminar variation in connectivity. W e used quantitative measurements of the density of a large number of corticocortical and thalamocortical connections from our own laboratories and from the literature. V ariability in the density of given corticocortical and thalamocortical connections is high, with the standard deviation of density proportional to the mean. The frequency distribution is close to exponential. Therefore, analysis methods relying on the normal distribution are not appropriate. W e provide an appendix that gives simple statistical guidance for samples drawn from exponentially distributed data. For a given corticocortical or thalamocortical connection density, between–individual standard deviation is 0.85 to 1.25 times the within–individual standard deviation. Therefore, much of the variability reported in conventional neuroanatomical studies (with one tracer deposited per animal) is due to within–individual factors. W e also find that strong, but not weak, corticocortical connections are substantially more variable than thalamocortical connections. We propose that the near exponential distribution of connection densities is a simple consequence of ‘patchy’ connectivity. W e anticipate that connection data will be well described by the negative binomial, a class of distribution that applies to events occurring in clumped or patchy substrates. Local patchiness may be a feature of all corticocortical connections and could explain why strong corticocortical connections are more variable than strong thalamocortical connections. This idea is supported by the columnar patterns of many corticocortical but few thalamocortical connections in the literature.
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20

Wang, Yuan Qing, Liang Zong, and Yong Jiu Shi. "Parametric Analysis on Flexural Capacity of Flange-Plate Connections Considering Prying Force." Advanced Materials Research 163-167 (December 2010): 3–10. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.3.

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Within construction industry developing rapidly in domestic, long span buildings and high-rise buildings emerge in endlessly. Steel tubular structures are increasingly widely used for its unique advantages. Thanks to the situation, flange-plate connections become more and more popular as an important solution of splicing steel tubular structures. The connections provide easy and fast installation，nice shape, simple constitution for tubular structures without the need for welding. Typical loading situations include axial tension force and moment for flange-plate connections. The loading capacity under axial tension was studied by many scholars. Unfortunately, study on flexural capacity of flange-plate connections is limited. This situation limits the generalization of the nice connections. As can be seen from the review on flange-plate connections, there is no doubt that doing research on flexural capacity of flange-plate connections is necessary. Previous studies on axial loading capacity of flange-plate connections can provide helpful options of research for this work. One of the options is to observe the prying forces caused by flange-plates’ deformation, for prying is an important influencing factor on axial loading capacity of flange-plate connections which can reduce capacity of the connection. It is same as axial loading case that prying forces exists in the tensile region of flange-plate connections under bending moment, and they should be paid attention because they can reduce the flexural capacity of the connections with no doubt. This paper addresses on four basic kinds of flange-plate connection’s flexural capacity and is developed by means of finite element method with finite element program ANSYS. Related FE models are established and checked compared with experimental results. Based on the reliable FE models, the subsequent analysis especially studies on the effect factors of prying force in the tensile region of connection in the tensile region of connection. The corresponding parametric analysis is developed, including the thickness of flange-plate, the ratio of outer and inner diameter of flange-plate, material property of bolts, etc. Finally the key effect factors are found. The conclusions from this paper can provide references for Engineering Design.
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Hedayat, Amir A., Ehsan Jazebi, Saman AsadAbadi, and Amin Iranpour. "Flexural Strength Prediction of Welded Flange Plate Connections Based on Slenderness Ratios of Beam Elements Using ANN." Advances in Civil Engineering 2018 (2018): 1–17. http://dx.doi.org/10.1155/2018/8059190.

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The present study was aimed to investigate the strength and ductility of welded flange plate (WFP) connections. Using the FE method, 52 WFP connections with different beam overall depths and beam flanges/web slenderness ratios were analyzed. Fragility curves indicated that, for a WFP connection which is designed based on the seismic codes, its strength is of more concern than its ductility. In addition, limiting the width-to-thickness ratios of the beam flanges and web plates to 0.3E/fy and 2.45E/fy, respectively, may not always lead to the achievement of adequate connection’s strength and ductility. Proposed theoretical formulas and artificial neural network- (ANN-) based models developed in this study were able to adequately predict the connection strength.
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22

Rahman, Ahmad Baharuddin Abd, Goh Hiang Miang, and Yusof Ahmad. "Grouted Pipe with Double Spirals for Precast Concrete Connections." Applied Mechanics and Materials 789-790 (September 2015): 1134–39. http://dx.doi.org/10.4028/www.scientific.net/amm.789-790.1134.

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This paper presents the pullout performance of grouted splice connections made with steel pipes and double spirals in connecting high tensile steel deformed bars. The parameters studied were the steel bar embedded lengths, grout strength and diameter of the pipe in influencing the tensile performance of the splice connections. A total of nine proposed grouted spiral connections with double spirals were tested under increasing axial tension until failure. The results indicated that the use of double spiral combined with grout strength of at least 60 N/mm2 and main steel bar embedded length of 10 times bar diameter could provide adequate bond strength to form a satisfactory precast connection system.
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23

French, Catherine Wolfgram, Michael Hafner, and Viswanath Jayashankar. "Connections Between Precast Elements—Failure within Connection Region." Journal of Structural Engineering 115, no. 12 (December 1989): 3171–92. http://dx.doi.org/10.1061/(asce)0733-9445(1989)115:12(3171).

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24

French, Catherine Wolfgram, Olanrewaju Amu, and Charbel Tarzikhan. "Connections between Precast Elements—Failure Outside Connection Region." Journal of Structural Engineering 115, no. 2 (February 1989): 316–40. http://dx.doi.org/10.1061/(asce)0733-9445(1989)115:2(316).

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25

Arciprete, Paolo, Roxane McKay, Geoffrey H. Watson, David I. Hamilton, James L. Wilkinson, and Robert M. Arnold. "Double connections in total anomalous pulmonary venous connection." Journal of Thoracic and Cardiovascular Surgery 92, no. 1 (July 1986): 146–52. http://dx.doi.org/10.1016/s0022-5223(19)35945-8.

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26

Nevdakha, Yurii, Volodymyr Pirogov, Nataliia Nevdakha, Liubov Olijnichenko, and Mykhailo Vasylkovsky. "Increasing the Safety Margin of Threaded Connections Operating Under Variable Loads." Central Ukrainian Scientific Bulletin. Technical Sciences 1, no. 6(37) (2022): 30–36. http://dx.doi.org/10.32515/2664-262x.2022.6(37).1.30-36.

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One of the most common types of plug-in connections are threaded connections. In any machine, unit, the number of parts of threaded connections (bolts, studs, nuts, washers, etc.) is calculated by dozens and hundreds of pieces. It follows from this that the issue of designing and calculating threaded connections is of great importance in the design of machines and devices. One of the most important elements of bolts and screws is the thread, which is the surface of the protrusion formed during the helical movement of an arbitrary flat contour on the side surface of a cylinder or cone. Threaded connections are widely used in various mechanisms (internal combustion engines, etc. products). Their use is due to simplicity, high load-bearing capacity, reliability, as well as the convenience of connecting and disconnecting parts. The calculation of tightened threaded connections operating under alternating stresses is a check calculation. Based on the simplified statement of the problem, the preliminary dimensions of the main elements of the threaded connection are determined. Then the layout of the connecting node is carried out, and after the design is fully determined, they begin to perform the verification calculation. In recent times, we have seen an increase in the interest of designers in the calculations of threaded connections operating under variable stresses. This is explained by the fact that in most mechanisms, in particular in the automotive industry, threaded connections work under variable stresses, but an incorrectly determined margin of strength of threaded connections leads to breakdowns and destruction of mechanisms. Thus, there is a need to study more accurate calculation formulas for determining the margin of strength of threaded connections, which is the result of a verification calculation.
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27

LaFave, James M., and James K. Wight. "Reinforced Concrete Wide-Beam Construction vs. Conventional Construction: Resistance to Lateral Earthquake Loads." Earthquake Spectra 17, no. 3 (August 2001): 479–505. http://dx.doi.org/10.1193/1.1586185.

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Experiments and analyses were conducted to address concerns about performance of reinforced concrete connections with shallow, wide beams subjected to lateral earthquake loading and to compare behavior of wide beam connections to that of conventional connections. Two wide beam-column-slab connections and one conventional beam-column-slab connection were subjected to cycles of reversing lateral displacements up to 5% drift. The conventional beam and wide beam connections exhibited similar overall load-displacement behavior, with similar beam plastic hinge development. The wide beam connections dissipated almost as much energy as the conventional beam connection and had greater slab participation and less joint and beam shear cracking than the conventional beam connection. Experimentally determined wide beam connection stiffness was closer to the conventional beam connection stiffness than had been predicted. Refined models were developed, with features such as rigid end offsets for wide beam connections, to better represent observed behavior. Nonlinear models were also developed that accurately captured differences in energy dissipation as well as stiffness.
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Bypour, Maryam, Benyamin Kioumarsi, and Mahdi Kioumarsi. "Investigation of Failure Mechanism of Thin Steel Plate Shear Wall in RC Frame." Key Engineering Materials 803 (May 2019): 314–21. http://dx.doi.org/10.4028/www.scientific.net/kem.803.314.

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In this paper, the behavior of steel plate shear wall (SPSW) in the reinforced concrete frame (RCF) has been studied numerically. Three different connections have been proposed to connect SPSW to RCF. In the first connection, fish plates, while in the second one, combination of fish plates and studs transfer forces between SPSW and RCF. In the third connection, there is no direct connection between the infill plate and RCF, and additional steel frame has been used for connecting of the infill plate. The results demonstrate that, load carrying capacity increases in all the specimens comparing the reference RCF. Investigating the formation sequence of plastic hinges in different specimens demonstrates that there is different sequence in the specimens with different connections.
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29

Vondra, Alexandr. "Natural dynamical connections." Czechoslovak Mathematical Journal 41, no. 4 (1991): 724–30. http://dx.doi.org/10.21136/cmj.1991.102503.

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30

Qiang, Xuhong, Xu Jiang, Frans Bijlaard, and Henk Kolstein. "Performance assessment on high strength steel endplate connections in fire." Journal of Structural Fire Engineering 7, no. 2 (June 13, 2016): 168–78. http://dx.doi.org/10.1108/jsfe-06-2016-013.

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Purpose This paper aims to investigate and assess a perspective of combining high-strength-steel endplate with mild-steel beam and column in endplate connections. Design/methodology/approach First, experimental tests on high strength steel endplate connections were conducted at fire temperature 550°C and at an ambient temperature for reference. Findings The moment-rotation characteristic, rotation capacity and failure mode of high-strength-steel endplate connections in fire and at an ambient temperature were obtained through tests and compared with those of mild-steel endplate connections. Further, the provisions of Eurocode 3 were validated with test results. Moreover, the numerical study was carried out via ABAQUS and verified against the experimental results. Originality/value It is found that a thinner high-strength-steel endplate can enhance the connection’s rotation capacity both at an ambient temperature and in fire (which guarantees the safety of an entire structure) and simultaneously achieve almost the same moment resistance with a mild steel endplate connection.
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31

Sadid, Mohammad Saber. "Effect of The Haunch Angle and Stiffener Types on Column-Beam Connection Behaviour Under Static Loading." October 2022 3, no. 4 (December 23, 2022): 1–13. http://dx.doi.org/10.36937/cebel.2022.1777.

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The strong column-weak beam principle, one of the earthquake resistant building design theories, require the connection area to be strong enough so that the plastic hinge forms in the beam. One of the proposed solutions is to strengthen the column-beam connection zone in steel connection with haunches. This study aims to look at parametrically behavior of column-beam haunched connections under the 100mm vertical displacement controlled loading using the finite element method. To obtain this, a total number of 21 finite elements model with 15, 30, and 45 degrees angles and 6 various stiffener types has been modeled by ABAQUS software. The research later discussed behavior of underlying components of haunch connections models such as the load-displacement curve, bearing capacity, extended end plate bending, stress distribution, and the position of the plastic hinge's development after finite element analysis. The study found that decrease in haunch angle improve the connection's bearing capacity, while in this case, the failure modes and plastic hinges will occur close to the joints which does not meet the code requirements. The article concludes that the 30-degree haunch angle is the most appropriate one in haunch connection and the three parallel and K-stiffeners is the most suitable reinforcement type for the haunched connections.
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32

Fleischhack, Christian. "Regular connections among generalized connections." Journal of Geometry and Physics 47, no. 4 (September 2003): 469–83. http://dx.doi.org/10.1016/s0393-0440(02)00232-2.

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33

Ma, Haiying, Minghui Lai, Xuefei Shi, Zhen Cao, and Junyong Zhou. "EXPERIMENTAL AND NUMERICAL STUDY ON COLUMN-FOUNDATION CONNECTION THROUGH EXTERNAL SOCKET." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 27, no. 3 (March 4, 2021): 162–74. http://dx.doi.org/10.3846/jcem.2021.14100.

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In practice, bridge foundations and pier columns are usually constructed with cast-in-place concrete. Precast columns are currently widely used in highway bridges in China, which can save construction time and improve concrete quality. The connection between precast bridge columns and the foundation can affect how forces transfer from one to the other. This paper investigates using external sockets to form a connection between the bridge column and foundation. This method can accelerate the bridge construction time with the additional advantages of improving the orientation and creating a large erection tolerance. Two types of connections are presented and tested to investigate the behavior of the column-foundation connections and find a more suitable way to use external socket connections. The experimental results show that the column-foundation connection design satisfies the design requirements. The results also show that roughening the column surface within the external socket is more effective at connecting the column to the foundation when using an external socket compared to attaching a steel plate on the column. The experimental results are validated with a finite element analysis, resulting in a proposal regarding the column-foundation connection behavior as well as design recommendations for the external socket connection.
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34

Li, Zheng Liang, Chun Tao Zhang, and Ru Heng Wang. "Experimental Study on Seismic Behavior of Cold-Formed Square Tube Beam-Column Connection with Welded Haunch." Advanced Materials Research 243-249 (May 2011): 677–81. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.677.

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The cold-formed thin-walled tube has been widely applied in high seismic fortification intensity region and post-seismic reconstruction area because of light quality, high strength and small deformation. But the connection mode and mechanical properties of beam-column connections still need further study. According to the "strong column and weak beam" seismic design principle and the thinking of control the position of plastic hinge, adding haunch slabs at the end of beam to reduce the number of repeated welding and avoid brittle fracture. Through the low cyclic loading experiment, four beam-column connections with welded haunch under different axial compression ratios have been studied, and connection’s hysteretic performance, energy-dissipating capacity, bearing capacity, rigidity and failure mode have been discussed. The result shows that: 1) the ultimate bearing capacity of connection with welded haunch is much great, and the energy dissipation capacity is very well, which can make this connection to absorb and consume great energy in earthquake. This connection can meet the need of seismic design very well. 2) The connection with welded haunch experiences much cycling time, has long yield platform after yield, has great cumulative energy-dissipating capacity and well ductility. 3) the final destruction of connection with welded haunch is caused by the beam’s local buckling. And the yield surface is almost located at the outside of connections. 4) The axial compression ratios has great effect on the hysteretic performance, bearing capacity and stiffness degradation for the connection with welded haunch.
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Faghfouri, M., and N. Jazer. "Shen's -process on Berwald connection." Ukrains’kyi Matematychnyi Zhurnal 72, no. 8 (August 18, 2020): 1134–48. http://dx.doi.org/10.37863/umzh.v72i8.6001.

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The Shen connection cannot be obtained by using Matsumoto's processes from the other well-known connections. Hence Tayebi–Najafi introduced two new processes called Shen's and -processes and showed that the Shen connection is obtained from the Chern connection by Shen's -process. In this paper, we study the Shen's - and -process on Berwald connection and introduce two new torsion-free connections in Finsler geometry. Then, we obtain all of Riemannian and non-Riemannian curvatures of these connections. Using it, we find the explicit form of -curvatures of these connections and prove that -curvatures of these connections are vanishing if and only if the Finsler structures reduce to Berwaldian or Riemannian structures. As an application, we consider compact Finsler manifolds and obtain ODEs.
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36

Liu, Yun-Lin, Jing-Jing Shi, Jun-Qi Huang, Guang-Shuo Wei, and Zhi-Xin Wu. "Grouting Defect Detection of Lapped Bar Connections Based on Impact-Echo Method." Shock and Vibration 2019 (October 14, 2019): 1–14. http://dx.doi.org/10.1155/2019/1934240.

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Grouted lap-splice connections are widely used for connecting precast concrete components. Grouting defects in the connections significantly influence the structural performance of the whole connection, which leads to the need for grouting defect detection. In this study, the impact-echo (IE) method was used for detecting defects in grouted lap-splice connections. Grouted connections with different levels of artificial grout defects were prepared in a shear wall, and the IE method was used to measure the frequency response. In addition, finite element (FE) analysis based on ABAQUS was conducted to simulate the tests. Based on the validated FE model, a parametric study was conducted to investigate the effect of the depth of the grout hole on the amplitude spectrum. The results indicated that (1) the IE method offered a good potential for grouting defect detection in grouted lap-splice connections; (2) the proposed FE model could well predict the frequency response of the grouting hole; and (3) the measured frequency and amplitude of the grouting hole in an impact-echo test would be considerably influenced by the hole depth.
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37

Jamalpour, Reza, Masood Nekooei, and Abdolreza Sarvghad Moghadam. "Seismic Response Reduction of Steel MRF Using SMA Equipped Innovated Low-damage Column Foundation Connection." Civil Engineering Journal 3, no. 1 (January 30, 2017): 1–14. http://dx.doi.org/10.28991/cej-2017-00000068.

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Connections in MRFs are the most important members and seismic behaviour is affected by function of beam column connections as well as column foundation connections. If the connections are able to provide the required ductility and efficiency against the seismic excitation, the seismic capacity of the MRF performed by these connections will be affected. SMAs have recently been used as a tool to dissipate energy in structures. So far, using of them for column foundation connections has been applied much less. In this paper, SMAs have been introduced and an innovated column foundation connection equipped with SMA has been suggested. Micro and macro behaviour of the connection has been studied and it was applied in sample MRF. Seismic response of the MRF under different earthquakes by equipping the connection with steels/SMAs bars have been studied and compared. Finally, results indicated that MRF with this connection showed proper seismic performance.
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38

Hollý, Ivan, and Ivan Harvan. "Connections in Precast Concrete Elements." Key Engineering Materials 691 (May 2016): 376–87. http://dx.doi.org/10.4028/www.scientific.net/kem.691.376.

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The structural integrity of precast concrete structures depends mainly on the connections between the precast structural elements. The purpose of a connection is to transfer loads, restrain movement, and/or to provide stability to a component or an entire structure. Therefore, the design of connections is one of the most important aspects in the design of precast concrete structures. All connections should design with valid codes. Every precasters have developed connection details over the years that suit their particular production and erection preferences. It is common, that the structural engineer to show loads and connection locations and allow the successful manufacturer’s engineering department to provide the final design and details of the connections.
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39

Behnamfar, Farhad, Hadi Rafizadeh, and Mortza Omidi. "Innovative connections for precast concrete moment resisting frames." Bulletin of the New Zealand Society for Earthquake Engineering 48, no. 3 (September 30, 2015): 204–21. http://dx.doi.org/10.5459/bnzsee.48.3.204-221.

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This research work presents new details for moment connections in precast concrete structures satisfying both design and practice criteria. In this paper the results of the numerical study on the connections are presented. For the analysis, the ANSYS software is selected because of its diversity in nonlinear analysis. By calculating the monotonic load-displacement curve of each connection, the connections are evaluated for their stiffness, strength, and ductility. The compressive strength of the connection concrete is taken to be 30, 35 and 40 MPa, for each round of analysis. The results of the analysis show that the proposed connections are stiff enough to be moment resisting and to be emulating an equivalent monolithic, or basic connection. It is illustrated that the connections are stronger but somewhat less ductile than the basic connection regardless of the concrete strengths examined. Moreover, it is shown that in each precast connection while increasing the compressive strength of concrete does not affect the connection stiffness considerably, it increases the ultimate load and ductility of the connection. As a main result of this study, the suggested connection details are categorized based on their stiffness, strength, and ductility. The suggested connections can be used in moment resisting precast concrete buildings based on the desired strength and ductility.
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40

BRZEZIŃSKI, TOMASZ. "NON-COMMUTATIVE CONNECTIONS OF THE SECOND KIND." Journal of Algebra and Its Applications 07, no. 05 (October 2008): 557–73. http://dx.doi.org/10.1142/s0219498808002977.

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A connection-like objects, termed hom-connections are defined in the realm of non-commutative geometry. The definition is based on the use of homomorphisms rather than tensor products. It is shown that hom-connections arise naturally from (strong) connections in non-commutative principal bundles. The induction procedure of hom-connections via a map of differential graded algebras or a differentiable bimodule is described. The curvature for a hom-connection is defined, and it is shown that flat hom-connections give rise to a chain complex.
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41

Goldman, Dee. "National Connections: Connecting Locally, Nationally, and Even Internationally." OLA Quarterly 6, no. 1/2 (2000): 6–7. http://dx.doi.org/10.7710/1093-7374.1543.

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42

Yang, Rongqian, and Xuejun Zhou. "Analysis of the Mechanical Behavior of Bolted Beam-Column Connections with Different Structural Forms." Advances in Civil Engineering 2019 (March 3, 2019): 1–11. http://dx.doi.org/10.1155/2019/1967253.

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In order to study the mechanical behavior of bolted beam-column connections, the accuracy and applicability of the finite element model were firstly validated according to the published experiments on end-plate connections using ABAQUS. Then, in order to discuss the mechanical behavior of connections, three semirigid connections which are convenient for prefabricated construction, including top-and-seat angle connections with web and ear plate, extended end-plate connection, and T-stub connection, were examined using numerical simulation analysis to study and compare their capacity, hysteretic behavior, ductility, and degradation characteristics in detail. The results showed that the finite element models that were built could effectively simulate the load bearing behavior of bolted connections under both single-direction loading and cyclic loading. The three connections showed good load bearing capacity. The connectors significantly affected the energy dissipation capacity under load. The extended end-plate connection demonstrated the best performance in both mechanical behavior and manufacture and installation, so it would therefore be the preferred option.
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Quilang, Liezl Joy Lazaro, and Lyndon Laborte Lazaro. "Mathematical connections made during investigative tasks in statistics and probability." International Journal of Evaluation and Research in Education (IJERE) 11, no. 1 (March 1, 2022): 239. http://dx.doi.org/10.11591/ijere.v11i1.21730.

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<span>The Philippines has undergone a fundamental overhaul of its educational system to highlight basic education and overcome its deficiencies. The educational reform prompts prospective teachers to connect the concepts taught to instill a more profound understanding. As such, the researchers explored the mathematical connections made by prospective secondary mathematics teachers while completing investigative tasks. The study employed a concurrent triangulation mixed-methods design. Data were gathered from 39 prospective secondary mathematics teachers enrolled in the state universities' flagship campuses in Northeastern Philippines. Data were gathered using mathematical connections evaluation, think-aloud strategy, and interviews. Frequency counts, percentages, mean percent scores, Pearson product-moment correlation coefficient, and analysis of the interviews' transcriptions were employed in the study. Results showed that the prospective teachers performed best in making instruction-oriented connections but have difficulty in making implications connection. Also, the prospective teachers' ability to successfully make the mathematical connection is directly linked to their knowledge of the concept, the algorithm, and the part-whole relationship. As such, reform efforts should be made to enhance mathematical connections, emphasizing statistical thinking, and reasoning. Moreover, higher education institutions should incorporate connecting as one of the intended learning outcomes for prospective mathematics teachers.</span>
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44

Jahic Pettersson, Alma, Lena A.E. Tibell, and Ragnhild Löfgren. "‘The brain needs nutrition’: pupils’ connections between organizational levels." Nordic Studies in Science Education 17, no. 1 (February 2, 2021): 48–63. http://dx.doi.org/10.5617/nordina.7930.

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Previous research suggests that connecting organizational levels of biological systems is challenging forpupils. In the present study we investigated 122 pupils’ written responses to a question in a national biologytest concerning how nutrient molecules are adsorbed by the small intestine and transported to thebrain. We aimed to investigate what awareness the pupils have of the connection between the digestiveand circulatory systems. We mapped the pupil’s expressed knowledge by using content analysis whichwas performed in five steps including connection between the systems, organizational levels and scientificexplanations. We found that the most correct descriptions contained the highest number of connectionsbetween the digestive and the circulatory systems and linking of the different organizational levels. Themost correct descriptions included the highest proportion of the meso level. Therefore, knowledge at themeso level seems to be essential for grasping connections between macro- and submicro-level processes,and connections of digestion and circulation systems.
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45

Alvarez, Juan, and Bruce Hajek. "A queue with semiperiodic traffic." Advances in Applied Probability 37, no. 1 (March 2005): 160–84. http://dx.doi.org/10.1239/aap/1113402404.

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In this paper, we analyze the diffusion limit of a discrete-time queueing system with constant service rate and connections that randomly enter and depart from the system. Each connection generates periodic traffic while it is active, and a connection's lifetime has finite mean. This can model a time division multiple access system with constant bit-rate connections. The diffusion scaling retains semiperiodic behavior in the limit, allowing for both short-time analysis (within one frame) and long-time analysis (over multiple frames). Weak convergence of the cumulative arrival process and the stationary buffer-length distribution is proved. It is shown that the limit of the cumulative arrival process can be viewed as a discrete-time stationary-increment Gaussian process interpolated by Brownian bridges. We present bounds on the overflow probability of the limit queueing process as functions of the arrival rate and the connection lifetime distribution. Also, numerical and simulation results are presented for geometrically distributed connection lifetimes.
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46

Alvarez, Juan, and Bruce Hajek. "A queue with semiperiodic traffic." Advances in Applied Probability 37, no. 01 (March 2005): 160–84. http://dx.doi.org/10.1017/s0001867800000082.

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In this paper, we analyze the diffusion limit of a discrete-time queueing system with constant service rate and connections that randomly enter and depart from the system. Each connection generates periodic traffic while it is active, and a connection's lifetime has finite mean. This can model a time division multiple access system with constant bit-rate connections. The diffusion scaling retains semiperiodic behavior in the limit, allowing for both short-time analysis (within one frame) and long-time analysis (over multiple frames). Weak convergence of the cumulative arrival process and the stationary buffer-length distribution is proved. It is shown that the limit of the cumulative arrival process can be viewed as a discrete-time stationary-increment Gaussian process interpolated by Brownian bridges. We present bounds on the overflow probability of the limit queueing process as functions of the arrival rate and the connection lifetime distribution. Also, numerical and simulation results are presented for geometrically distributed connection lifetimes.
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47

Rooney, S. "Connection closures adding application-defined behaviour to network connections." ACM SIGCOMM Computer Communication Review 27, no. 2 (April 1997): 74–88. http://dx.doi.org/10.1145/263876.263887.

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48

Tilly, Louise A. "Connections." American Historical Review 99, no. 1 (February 1994): 1. http://dx.doi.org/10.2307/2166160.

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49

Hill, Willie L. "Connections." Music Educators Journal 89, no. 2 (November 2002): 4–5. http://dx.doi.org/10.2307/3399832.

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Hill, Willie L. "Connections." Music Educators Journal 89, no. 1 (September 2002): 6–8. http://dx.doi.org/10.2307/3399875.

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