Literatura académica sobre el tema "Panel-structure connections"
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Artículos de revistas sobre el tema "Panel-structure connections"
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Menichini, Giovanni, Emanuele Del Monte, Maurizio Orlando y Andrea Vignoli. "Out-of-plane capacity of cladding panel-to-structure connections in one-story R/C precast structures". Bulletin of Earthquake Engineering 18, n.º 15 (7 de octubre de 2020): 6849–82. http://dx.doi.org/10.1007/s10518-020-00962-5.
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Abstract The interaction between cladding panels and the main structure is a crucial point to assess the seismic response, and above all the structural safety, of RC precast industrial building. In the past, connections were often designed to allow construction tolerances and to accommodate both thermal and wind-induced displacements. The lack of specific details to allow relative in-plane displacements between cladding panels and the main structure often led to the participation of cladding panels in the structure seismic-resistant system with consequent connection failures. In the last decades, a lot of experimental tests were performed to investigate the in-plane performance of panel connections, and some design recommendations have been developed accordingly. In the out-of-plane direction, the connections were often considered to be infinitely rigid and not to suffer any damage by the seismic load. This work deals with the out-of-plane response of panel-to-structure connections for vertical panels typical of industrial and commercial precast buildings. Both standard hammer-head strap and new devices, called SismoSafe, were investigated. Tests were performed in the Structures and Materials Testing Laboratory of the Department of Civil and Environmental Engineering of Florence, where a specific setup was designed to perform cyclic and monotonic tests on the connection devices. Standard connections showed a rather limited resistance, while the innovative connections exhibited a high out-of-plane resistance. Numerical analyses were also performed on a case study building to evaluate the distribution of the out-of-plane demand on the connections.
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Dal Lago, Bruno, Francesco Foti y Luca Martinelli. "Seismic actions induced by cladding panels on precast concrete frame structures". International Journal of Business & Technology 6, n.º 3 (1 de mayo de 2018): 1–6. http://dx.doi.org/10.33107/ijbte.2018.6.3.15.
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The strong earthquakes occurred in Southern Europe in the last decade pointed out a poor seismic performance of the connection system of the cladding of precast industrial structures. The cladding of these buildings usually consists of sandwich concrete panels of remarkable mass, connected to the frame structure with mechanical devices. The estimation of the out-of-plane seismic action on these connections is a key step for their correct proportioning. However, the formulation currently provided in the Eurocode 8 for the estimation of the seismic action on non-structural elements was calibrated with different objectives. Furthermore, given there is no in-plane structure-panel interaction, a quote of the panel mass is lumped in correspondence of their connection for a correct proportioning of the frame structure. The designers need to make assumptions on both aspects that often bring to remarkably different solutions. The paper presents a consistent dynamic formulation of the problem of the vibration of rigid bodies connected with cantilever columns. The solution brings to closed-form equations to evaluate the exact out-of-plane action on the connections and the correct amount of panel mass to be lumped.
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Guo, Wei, Zhipeng Zhai, Zhiwu Yu, Feng Chen, Yongzhi Gong y Tao Tan. "Experimental and Numerical Analysis of the Bolt Connections in a Low-Rise Precast Wall Panel Structure System". Advances in Civil Engineering 2019 (30 de mayo de 2019): 1–22. http://dx.doi.org/10.1155/2019/7594132.
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This paper develops a novel dry connection utilizing high-strength bolts and introduces the corresponding low-rise precast wall panel structure system. To investigate the seismic performance of the structure system with full bolt connections, monotonic loading tests of the connection joint and cyclic lateral loading tests of three full-scaled precast shear walls are both conducted. Based on the test data, axial and shear mechanical models of the connection are given. Meanwhile, experimental results show that the failure mode of the connection is dominated by anchored rebar ductile rupture, and the precast structure system presents a stable energy dissipation capacity and a good seismic ductility. The numerical model of the precast shear wall is then developed and validated by the cyclic loading test. Also a simplified calculation method to predict the lateral strength of the precast shear wall is proposed. According to the calculation results, the distance between the center of the connection and the edge of the shear wall is suggested to be 150 mm, while the wall thickness is recommended to be 120 mm or 150 mm. Finally, a three-story precast wall panel structure is employed to assess the collapse performance of the proposed precast structure system by using the presented numerical model. The results indicate that the proposed structure system with full bolt connections has high stiffness and high seismic resistance against collapse.
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Liu, Ruo Nan, Kai Yin Zhang y Meng Lan Tao. "Test Study on Mechanical Performance of the Flexible Connections of the Precast Concrete Wall Panel". Advanced Materials Research 900 (febrero de 2014): 487–90. http://dx.doi.org/10.4028/www.scientific.net/amr.900.487.
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To explore the performance of the flexible nodes between the precast concrete wall panel and the frame structure, a steel truss is used as an analogue of the frame structure to develop a test. In the test, one precast concrete wall panel was installed on the steel truss, and the connection nodes are designed to be able to slip vertically. Different horizontal forces were exerted on the steel truss to form certain drifts, and the deformation of panel and the slipping performance of the connection nodes were explored. It is found that precast concrete wall panel wont deform under the influence of the drifts, while the connection nodes between the frame structure and the panel were found to slip. The results show that the design of slipping connection node has enough reliability.
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Sielaff, Brian J., Richard J. Nielsen y Edwin R. Schmeckpeper. "Evolution of Design Code Requirements for Exterior Elements and Connections". Earthquake Spectra 21, n.º 1 (febrero de 2005): 213–24. http://dx.doi.org/10.1193/1.1856537.
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Seismic design requirements for precast concrete cladding panel connections have evolved significantly over the past fifty years. This paper summarizes the pertinent requirements from the Uniform Building Code from 1967 to 1997, and the International Building Code 2000. A hypothetical design illustrates how emphasis in the code has evolved for both lateral force requirements and story drift displacement requirements arriving at a balance of moderate lateral force and displacement requirements. The numerical results are based on a hypothetical case of panel connections for a ten-story moment-resisting steel frame structure built in seismic Zone 4. This historical summary is of value to designers who deal with the seismic rehabilitation of precast panel connections.
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Guo, Wei, Zhipeng Zhai, Yao Cui, Zhiwu Yu y Xiaoli Wu. "Seismic performance assessment of low-rise precast wall panel structure with bolt connections". Engineering Structures 181 (febrero de 2019): 562–78. http://dx.doi.org/10.1016/j.engstruct.2018.12.060.
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Chong, Xun, Pu Huo, Linlin Xie, Qing Jiang, Linbing Hou y Jinchen Xie. "Experimental investigation of seismic performance of a novel isostatic frame-cladding system". Advances in Structural Engineering 25, n.º 5 (10 de enero de 2022): 1015–26. http://dx.doi.org/10.1177/13694332211057264.
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A new connection measure between the precast concrete (PC) cladding panel and PC frame structure is proposed to realize a new kind of isostatic frame-cladding system. Three full-scale PC wall-frame substructures were tested under the quasi-static load. These substructures included a bare wall-frame specimen, a specimen with a cladding panel that has no opening, and a specimen with a cladding panel that has an opening in it. The damage evolution, failure mode, load-bearing capacity, deformation capacity, and energy dissipation capacity of three specimens were compared. The results indicated that the motions of the cladding panels and the main structures were uncoupled through the relative clearance of the bottom connections, and three specimens exhibited approximately identical failure modes and seismic performance. Thus, the reliability of this new isostatic system was validated.
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Lestari, Marsya Chikita y Cynthia Afriani Utama. "Board Structure Problem in Aviation Companies: The Relationship of Political Connection and Multiple Directorship on Firm Performance". Jurnal Keuangan dan Perbankan 25, n.º 3 (2 de agosto de 2021): 617–41. http://dx.doi.org/10.26905/jkdp.v25i3.5892.
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This study analyzes the relationship between the political connection and multiple directorships of aviation companies’ board members and their firm performance. This research will focus on companies in the aviation sector on a broader subsector than previous studies. It will help the shareholder of the aviation companies determine board structure policies and evaluate the implementations conducted so far. This research uses descriptive statistics and regression analysis for the panel data model. Moreover, this study uses a purposive sampling technique secondary data from the aviation company’s annual reports in the Asia continent for the 2016-2020 period. The results show that the multiple directorships negatively affect firm performance in aviation companies while the board’s political connections positively affect firm performance, measured by its Return on Equity (ROE). In contrast, the multiple directorships and political connections do not impact aviation companies' firm performance measured by their Return on Assets (ROA). Overall, this study in the Asia continent asserts the previous study where the political connection positively affects the airline’s firm performance in the US. The result can support the corporate governance practice of deciding board structure in the aviation sectors in Asia in terms of political connection and multiple directorships.DOI: 10.26905/jkdp.v25i3.5892
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Isaincu, Alexandru, Mario D’ Aniello y Aurel Stratan. "Implications of Structural Model on the Design of Steel Moment Resisting Frames". Open Construction and Building Technology Journal 12, n.º 1 (23 de mayo de 2018): 124–31. http://dx.doi.org/10.2174/1874836801812010124.
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Background: Studies have shown that the flexibility of the connections has an important role in the distribution of forces and moments in the structure. This also applies for the displacements, deformations and the stability of the structure. Objective: The objective of the present study is to investigate the influence of the stiffness of column web-panel and connection on the ultimate response of Moment Resisting Frames (MRFs). Methods: A comprehensive parametric study was carried out. In particular, a set of one hundred and twenty planar frames was analyzed, considering three approaches for modelling the joints. Results: The results highlight that neglecting the influence of the connection and column web panel leads to significant over-estimation of the global instability factor αcr, which can lead to unconservative design and assessment of steel frames, especially for those cases subjected to severe horizontal forces as the seismic actions. Conclusion: Accounting for the joint deformability in MRFs is important even for the cases with connection stiffness (kb) larger than 25 times the beam stiffness where EN1993-1-8 allows neglecting the model of the connection stiffness. Indeed, the comparison of cases with kb ≥ 25 between the models with and without the connection deformability show that of αcr can decrease from 5% to 16%, depending on the refinement of the modelling assumptions. This decrease also lead to higher second order effects and thus to higher design forces but also the overall stiffness of the frame is overestimated.
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Magliulo, Gennaro, Marianna Ercolino, Crescenzo Petrone, Orsola Coppola y Gaetano Manfredi. "The Emilia Earthquake: Seismic Performance of Precast Reinforced Concrete Buildings". Earthquake Spectra 30, n.º 2 (mayo de 2014): 891–912. http://dx.doi.org/10.1193/091012eqs285m.
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On 20 and 29 May 2012, two earthquakes of MW5.9 and MW5.8 occurred in the Emilia region of northern Italy, one of the most developed industrial centers in the country. A complete photographic report collected in the epicentral zone shows the seismic vulnerability of precast structures, the damage to which is mainly caused by connection systems. Indeed, the main recorded damage is either the loss of support of structural horizontal elements, due to the failure of friction beam-to-column and roof-to-beam connections, or the collapse of the cladding panels, due to the failure of the panel-to-structure connections. The damage can be explained by the intensity of the recorded seismic event and by the exclusion of the epicentral region from the seismic areas recognized by the Italian building code up to 2003. Simple considerations related to the recorded acceleration spectra allow motivating the extensive damage due to the loss of support.
Tesis sobre el tema "Panel-structure connections"
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Menichini, Giovanni. "Seismic response of vertical concrete façade systems in reinforced concrete prefabricated buildings". Doctoral thesis, 2020. http://hdl.handle.net/2158/1220505.
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The design of “non-structural” elements, including the cladding panels for precast RC buildings,
plays a key role in the building seismic response. The large damages that occurred in precast RC
buildings, during the recent earthquakes in southern Europe were mainly caused by the collapse
of the cladding panels. Therefore, is required to revise, to revise the technological and design
philosophy the panel-to-structure connection devices in RC precast structures.
Starting from these considerations, the main topic of this thesis is the investigation of such
connection devices. Deeply understanding the working principle of these systems makes it
possible to open a way to solve the problem.
The influence of the panels to the global response of precast structure is studied for different
types of panel-to-structure connections (two types of hammer-head straps) and panels-to-foundation
connections (fixed and rocking panels). Numerical models for the in-plane response
of connection devices are developed using both existing experimental data from shaking table
test performed by University of Ljubljana and result of new tests carried out at the Structures
and Materials Testing Laboratory of University of Florence
A new connection device, which better uncouples the in-plane seismic response, is developed
and studied analytically and experimentally.
The study highlights that traditional devices fail due to their limited in-plane displacement
capacity while the new device has much better behaviour. The study showed that in-plane
direction was critical for connection compared to the out-of-plane one. It also showed that
fixed-base panels provide a better seismic performance of connection devices.
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Wang, Sunguo. "Influence of panel structure on wood to flakeboard nail connection properties". Thesis, 2001. http://hdl.handle.net/2429/11493.
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Oriented Strand Board (OSB) or flakeboard is widely used in the building industry as
different components such as shear walls, floors, roofs and underlayments. The
performance of OSB to lumber connections has been investigated by many researchers,
but its relationship to OSB or flakeboard panel structure has never been systematically
studied. The study presented in this thesis focuses on this research scope.
The research project was divided into two parts. Preliminary tests (Phase I) on OSB-tolumber
nail connections were conducted using 11 mm commercial OSB panels as side
members and Spruce-Pine-Fir (SPF) lumber as main members. Several combinations of
OSB specimen sizes, nailing patterns and test set-ups were investigated. Tensile loads
were applied statically along the longitudinal direction of the lumber member, but
perpendicular to the nail shank for all specimens. Both the single nail and the two-nail
combination patterns were examined in OSB specimen I (50x240x11 mm) and specimen
II (240x240x11 mm). Loading directions relative to OSB face flake orientation were
studied for specimen II. The results showed that the chosen test jigs were suitable for
small sized OSB-to-lumber nailed connections. The new set-up with specimen II was
more efficient for small scale nail connection testing since the specimen can be easily
adjusted to study the influence of the loading directions, nailing patterns and multiple
nailing; hence, more information could be obtained. Two main failure modes, pullthrough
and pull-out, were observed in the preliminary tests.
The second part of the project (Phase II) included the main tests. Three principal
processing parameters, flake orientation, flake thickness and board density, were
considered in the experimental design of flakeboard structures. A Monte Carlo computer
program WinMat® was used to simulate mat structure patterns and their corresponding
horizontal density profiles. A robot-based formation system was applied to build
flakeboard mats, which ensured exactly the same mat structures as defined in the
computer program. Predefined and laboratory-manufactured oriented and random
flakeboards were then conditioned and assembled with 38x89 mm SPF lumber into nail
connections. Single nail lateral resistance tests were conducted to study the effects of
failure modes, panel types and loading directions on nail-connection properties. The
results showed that: 1) most nail properties for the specimens that failed in the pull-out
mode were significantly different from those in the pull-through mode; 2) the specimens
that failed in the pull-out mode had higher initial stiffness and connection strength
(maximum, yield and ultimate loads) than those in the pull-through mode; 3) compared to
OSB panels, random panels had higher connection strength for the pull-through mode,
larger maximum displacement for the pull-out mode, and higher maximum and ultimate
strain energies, and larger ultimate displacement for both failure modes; 4) the 90°
loading direction in OSB panels indicated significantly different nail properties for both
pull-out and pull-through modes, compared with the 0° and 45° loading directions, but
there were no significant differences in nail properties between 0° and 45° loading
directions under the pull-through mode; 5) there was significant difference in connection
strength between 0° and 45° loading directions under the pull-out mode; 6) from
regression analyses, most of the OSB or random flakeboard to SPF lumber nail
connection properties were affected by different combinations of panel local density
(LD), board to flake thickness ratio (TR), and lumber specific gravity (G); 7) a parametric
study was carried out to show a potential application of the information developed in this
paper; generally, higher lumber specific gravity and panel local density mostly showed
better initial stiffness and connection strength (loads) within the regression ranges and
fixed lumber or flakeboard properties. However, the effect of panel to flake thickness
ratio is comparatively complex. Different types of connection or loading conditions may
produce opposite trends. Hankinson's equation predicts very close initial stiffness and
maximum load to measured values at 45° loading angle based on nail properties along
and across OSB face flake alignment, and may also have good predictions on the nail
performance at any loading angle, which will be verified in the further study.
Capítulos de libros sobre el tema "Panel-structure connections"
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Jin, Ying. "Spatial Economics, Urban Informatics, and Transport Accessibility". En Urban Informatics, 115–32. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8983-6_8.
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AbstractOne central pillar in the development of urban science which is key to the development of simulation of models of urban structure is spatial econometrics. In this chapter, we outline the way in which ideas pertaining to accessibility which we define conventionally, as in transport economics, as the relative nearness and size of locations to one another, can be embedded in a wider econometric framework. We are thus able to explore how GDP (gross domestic product) of different locations is influenced by different spatial investments. To illustrate this, we first outline the intellectual context, followed by a review of the most relevant econometric models. We examine the data required for such models and look at various quantifications in terms of elasticities of business productivity with respect to transport accessibility, using ordinary least squares, time-series fixed effects, and a range of dynamic panel-data models which narrow down the valid range of estimates. We then show how the model is applied to Guangdong province (with its connections to Hong Kong and Macau), which is one of the three major mega-city regions and a leading adopter of new technologies in China.
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Gillon, Carrie, Edward Delmonico, Randi Martinez y Spencer Morrell. "Bringing language construction from the classroom to the community". En Language Invention in Linguistics Pedagogy, 137–68. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198829874.003.0010.
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This chapter discusses the connection between constructed language courses and opportunities to connect with the wider community. Conlang courses are a fruitful way to engage and attract students into linguistics, but they can also be used to bring linguistics into the world at large. The focus of this chapter is a Special Topics in Linguistics class at Arizona State University. This chapter describes the course structure, discusses the pros and cons of this particular structure, and provides examples of the languages created in the class. This course also led to unexpected opportunities to bring linguistics into the larger community, in the form of panels at two different fan conventions. During each panel, the students described their own languages, and the choices they made in creating them. This chapter provides example slides from these panels and discusses the process of creating the panels, the outcomes, and the resulting interactions with the public.
Actas de conferencias sobre el tema "Panel-structure connections"
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Zdražilová, Michaela, Zdeněk Sokol y Martina Eliášová. "Tests of Glass Banister Panels with Embedded Laminated Connections". En IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/prague.2022.1482.
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<p>Trends in modern architecture are heading towards a complete transparency of structures, which makes glass a very popular building material. However, achieving a completely transparent look of a structure may be problematic mainly due to glass elements connections. The connections must be capable of bearing all stresses performing during the lifetime period and meet high aesthetical standards at the same time. An embedded laminated point connection represents a progressive glass fixing systems. An ongoing research of the Czech Technical University in Prague is focused on the characteristics of this type of connection. Within this research, a set of real-scale laminated banister panels with two sets of embedded point connections was tested. The experiment showed the way of collapse and a short-term resistance of a laminated glass panel with two sets of embedded point connections under vertical loads.</p>
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Azarnejad, Azita, Nathan Murdoch, Katherine Hikita y Jadwiga Kroman. "The City of Calgary 12 Street Bridge Replacement and Monitoring". En IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.2107.
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<p>This project included the construction of a new three-span, 170 m-long steel box girder bridge to replace the existing St. George’s Island Bridge over the Bow River. The new bridge is composed of variable depth (arched), rectangular, steel box girders. Flood resiliency and sustainability were major considerations in the design of the bridge. The girders have a curved profile that allows for the majority of the superstructure to sit at least 1 m above the 1:100 year flood level. To minimize the work required over the river, full-depth, full-width, precast concrete deck panels were used. The panel-to-panel and panel-to-girder connections were made with Ultra-High-Performance Concrete (UHPC). Continuity of bridges with full-depth precast panels is usually provided by longitudinal post-tensioning. This was not preferred due to concerns about future deck rehabilitations. Therefore, the design relies on reinforcement splices for continuity. UHPC made it possible to transfer longitudinal forces in relatively short splice lengths. To verify the efficiency of these connections, some of the panels and connecting joints were instrumented with wireless strain gauges to monitor force transfer between adjacent panels. The paper includes a description of the bridge structure (girders and the precast deck panels) and the initial results of the strain monitoring.</p>
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Bober, Waldemar y Przemyslaw Stobiecki. "Experimental geodesic dome with a sandwich panels structure". En Human Interaction and Emerging Technologies (IHIET-AI 2022) Artificial Intelligence and Future Applications. AHFE International, 2022. http://dx.doi.org/10.54941/ahfe100895.
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The popularization of geodesic domes as a living space was one of R. B. Fuller's challenges for modern mankind. The search for a technology that can optimally satisfy this desire in a society living in a temperate climate has become the goal of the structural studies described in this study. The technological solution for the layer of sandwich panels depends on the adopted discrete division of the polyhedron surface. Due to the relatively simple shape of this element, the dodecahedron was adopted as the basis form. The designated triangular elements constitute the initial shape of the basic element. The shape of the spatial solid of this element has been obtained as the result of the analysis of the edges of connections between triangular panels. The use of thin GRC concrete slabs in the load-bearing layers allows it to work with metal edges around the perimeter of the panel. The design solutions for the geometry of the structure nodes are of decisive importance for the technology of assembling the panels into a compact arrangement of the spherical shell. In order to assess the technical value of the created model, an original measurement system was designed based on statically operating measurement poles. The system of mechanically adjustable measuring poles has two functions in the same position: as the adjustable load that causes deformation, and as the protection of the model in case of loss of stability during strength tests. The research experience obtained on the initial model will be used in further detailed testing of the sandwich panel roofing system described below.
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Mitchell, Toby, Jin Chen y Danny Karas. "Buildings as bridges: Hangzhou Greenland inter-tower bridge and draped roof". En IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.1741.
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<p>The Hangzhou Greenland project consists of two towers connected by a 60m long-span bridge housing a ballroom and outdoor space and a hanging canopy structurally suspended between the two towers that covers the outdoor space. The geometry of the hanging canopy was developed through an intensive collaboration between the architecture and engineering teams, with the result that the structural quantities are minimized, the doubly-curved surface is tiled with faceted flat quadrilateral glazing, and the nodal connections have no geometric torsion. The geometric intricacy of the structure required the development of a tightly integrated digital workflow to allow refinement of the design and communication of design data and intent to the local engineer and architect. A pressure tap wind tunnel study was used to estimate expected wind loads, and performance-based evaluation of glass panel warping and shear was developed. The final design tightly integrates the bridge, tower, and hanging canopy in a fine-tuned whole. </p>
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Yan, Shengyu y Jasmin Jelovica. "Topology Optimization of Joints Between Prismatic Sandwich Panels and Girders Under In-Plane and Bending Loads". En ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-79418.
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Abstract Prismatic sandwich structures offer improved mechanical properties over traditional structures used in ships and other vehicles. While research on their response and strength under local and hull girder loads has been advancing, insufficient attention has been placed on their joints, i.e. connections to surrounding structure, such as girders and bulkheads. It is important to seek appropriate topology of the joints to minimize stress they experience. We conduct this investigation via topology optimization, minimizing stress for a given volume fraction of a material. Aggregation approach is used where a p-norm function approximates the maximum stress in the finite element analysis to reduce the number of iterations to reach converged solution. Optimization is performed using sequential convex approximations via Method of Moving Asymptotes (MMA). The optimization is performed in Matlab. Maximum stress of optimized designs is validated using Abaqus. Joints are optimized for three load cases, combining moment on the joint (coming from lateral pressure on the panel) with in-plane tension and compression. Several topologies of the joint were found which feature 2–3 times smaller maximum stress than the conventional joint, even for lower structural weight (material volume fraction). However, the complexity of the joint is increased, which can be controlled effectively by the filter radius and passive elements.
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Iijima, Kazuhiro, Megumi Sakai, Masahiko Fujikubo y Akira Tatsumi. "Hydro-Elastoplastic Analysis for Predicting Collapse Behavior of VLFS Under Large Waves". En ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54890.
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This paper addresses collapse behavior of Very Large Floating Structure (VLFS) under large wave loads, as part of risk analysis. In predicting the consequence of collapse, the deformation of VLFS consisting of elastic and plastic ones under the large load event must be addressed. The deformation interacts with the fluid around it. Therefore, hydro-elastoplastic analysis needs to be developed. The whole VLFS structure is modeled as two elastic beams with an elasto-plastic hinge embedded at the connection. The deformation behavior is formulated by using finite element method (FEM). The hydrodynamic behavior is modeled by using Rankine source panel method based on two-dimensional and time-domain potential theory. The two domains are coupled. A series of simulation and tank test results for the basic collapse behavior of VLFS is presented.
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Kang, Yonggang y Haodi Ren. "Optimization of Riveting Assembly Process Parameters for Aviation Large Panels Based on Mesoscopic Features". En ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-69352.
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Abstract The aviation large panel is an important component that constitutes the aerodynamic shape of the aircraft. It has the characteristics of large size, thin wall and weak rigidity. It is prone to produce assembly deformation during the automatic drilling and riveting assembly connection process, including the overall bending and torsion deformation of the panel, and the defects around the rivet. In this paper, through the test of automatic drilling and riveting assembly of large panels, a local sinking deformation along the axis of the long stringer is found. The cause of this deformation problem is complex and directly affects the subsequent assembly process. It is a strong coupling problem between the automatic drilling and riveting process and the elastic-plastic deformation of the rivet and its connected parts, and it has a high correlation with the meso-structure of the plate structure around the nail hole after the rivet is riveted. Aiming at this deformation problem, this paper first established a process model of the riveting process and designed riveting test pieces with different process parameters. The effects of riveting force, riveting process time, and upper riveting cavity on the meso-structure of the riveting area are explored, and the correlation between the meso-structure of the riveting area and the riveting process parameters is analyzed. Then, based on the above research, a finite element numerical model of a typical aircraft siding riveting component structure including meso-structure is established. Through the finite element simulation calculation of the model, the coupling relationship between macroscopic deformation and mesoscopic structure is further explored, the existence of local subsidence and deformation along the axis of the long truss is verified.
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Botkin, Mark, Alan Browne, Nancy Johnson, Sukru Fidan, Richard Jeryan, Hikmat Mahmood, Richard Wang, Larry Lalik y Doug Peterson. "Development of a Composite Front Structure for Automotive Crashworthiness". En ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0970.
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Abstract This paper will summarize the results of a major project of the Automotive Composites Consortium (ACC) to focus on the use of composites in a vehicle front-end structure. The emphasis of the project was to replace the entire steel front structure of a production automobile with a molded composite front structure. The project focused on the development of a completely new reinforcement architecture which emphasized production feasible preforming methods: triaxially braided glass fibers over foam cores make up the upper and lower rails and the connecting panel can be formed from either thermoformed continuous strand mat or directed fiber, and utilized an Resin Transfer Molding (RTM) process. The front structure of the vehicle was redesigned and replaced with production-feasible composite components designed for crash energy management requirements as well as other overall structural considerations. The paper will describe the many design, analysis and test phases of the project which led up to a successful barrier test to verify structural crashworthiness. A fully dressed and instrumented vehicle was built up to incorporate the composite front structure and the vehicle was barrier crash tested at 56 kph. The vehicle passed the test — all performance measures were well within the Federal MVSS requirements — and all but one measure yielded improved performance over the all-steel production vehicle. In addition, the composite parts are 25% lighter than the steel parts they replace.
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Hasan, Muhammad S., Wichuda Munbua, Edgard B. Malta, Rodolfo T. Gonçalves, Chikako Fujiyama y Koichi Maekawa. "Conceptual Design of a Concrete Multi-Column Floating Platform Supporting a 10 MW Offshore Wind Turbine". En ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-78816.
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Abstract Wind energy is clean, eco-friendly, economic, and infinite-resource. In reducing carbon emissions, onshore and offshore wind energy becomes one of the essential considerations. The purpose of this paper is to conceptually design a concrete semi-submersible floating structure for 10 MW wind turbine using precast panel-based concrete, i.e. a concrete floating offshore wind turbine (FOWT). The design was applied by considering different parameters, such as main floater dimensions, thickness of the concrete panels, heave plate dimensions, draft of the platform, thick concrete portion at the connecting part between concrete floater and steel tower. The environmental conditions were taken from the Japanese coast, to analyze the dynamic behavior of the proposed concrete semi-submersible floater in waves and wind. A seawater ballast system was proposed for maintaining the draft of the platform during the operation and during the installation phase of the concrete FOWT. A parametric study was conducted based on some restrictions to check the feasible cases. A detailed comparison was presented for three cases and the best potential case was proposed. This paper successfully illustrated the hydrostatic, hydrodynamic and aerodynamic behavior to confirm the stability of the concrete floater for 10 MW FOWT.
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Wu, Haoran, Xiaobin Lin y Jie Zhang. "An Arrow-Shaped Honeycomb Pedestal With Negative Poisson Ratio and its Impact Resistance". En ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95745.
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Abstract The ship’s pedestal is the connection structure between the ship’s equipment and the hull, and is also the basis for the installation of the equipment. The pedestal bears both the static load generated by the weight of the equipment and the dynamic load generated during the operation of the equipment, and at the same time transmits the external load received by the hull to the equipment, and the load it bears is very complicated. If there is a problem with the pedestal in an impact environment, the accuracy of the system equipment will be affected, the system equipment will not work properly. Negative Poisson’s ration structures have a unique set of properties because of their tensile expansion, such as increased shear modulus, enhanced fracture toughness, better energy absorption and co-curvature. In recent years, the negative Poisson’s ration honeycomb structure has been applied to the pedestal of marine equipment, which demonstrates good vibration damping effect. However, the pedestal has two functions: vibration damping and impact resistance, there is not much research on the impact resistance of the pedestal. In this paper, an “arrow-shaped” honeycomb pedestal is taken as the research object. Firstly, the analytical expression of the Poisson’s ration of the honeycomb pedestal is derived theoretically and the influence of each parameter on the Poisson’s ration is analyzed. Secondly, the effect of Poisson’s ration on the impact resistance of the pedestal was analyzed by ensuring that the pedestal height was constant. It was found that with the reduction of Poisson’s ration, the impact resistance of the pedestal and the output impact environment of the pedestal panel were effectively optimized. Finally, by ensuring that the height of the pedestal is constant and the Poisson’s ration is the same, the influence of the number of honeycomb layers on the impact resistance of the pedestal is analyzed.