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Comparison of studs and Perfo-Bond Strips on Mechanical Behavior of Composite Girders under Negative Bending

Journal of Civil Engineering and Architecture 2013年第6期7卷 677-685页

作者： Weiwei Lin Teruhiko Yoda Department of Civil and Environmental Engineering Waseda University Tokyo 169-8555 Japan

The purpose of the present study is to investigate the influence of different types of shear connectors on mechanical behavior of composite steel and concrete girders under negative bending moment. Two overturned simply supported steel-concrete composite girders with different shear connectors including studs and PBLs （perfo-bond strips） were tested under point load in the mid-span. Based on the experimental observations, a three-dimensional FE （finite element） model capable of analyzing the composite girders subjected to negative bending moment was built. Load and deformation response, concrete initial cracking and composite girder ultimate load bearing capacity, strain development process of reinforcing bars before and after concrete cracking were observed in the test and compared with the numerical values. Results predicted by this modeling method are in good agreement with those obtained from the tests. Furthermore, the %rack closure＂ or ＂through crack＂ load were recorded by π-ganges in the tests and compared with the code-specified ultimate load.

关键词： Composite steel and concrete girder negative bending moment studs PBLs.

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Behavior and strength of headed stud shear connectors in ultra-high performance concrete of composite bridges

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Frontiers of Structural and Civil Engineering 2019年第5期13卷 1138-1149页

作者： Jianan QI Yuqing HU Jingquan WANG Wenchao LI Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education School of Civil EngineeringSoutheast UniversityNanjing 211189China

This study presents an experimental and numerical investigation on the static behavior of headed stud shear connectors in ultra-high performance concrete (UHPC) of composite bridges. Four push-out specimens were tested. It was found that no cracking, crushing or splitting was observed on the concrete slab, indicating that UHPC slab exhibited good performance and could resist the high force transferred from the headed studs. The numerical and experimental results indicated that the shear capacity is supposed to be composed of two parts stud shank shear contribution and concrete wedge block shear contribution. The stiffness increment of a stud in UHPC was at least 60% higher than that in normal strength concrete. Even if the stud height was reduced from 6d to 2d, there was no reduction in the shear strength of a stud. Short stud shear connectors with an aspect ratio as small as 2 could develop full strength in UHPC slabs. An empirical load-slip equation taking into account stud diameter was proposed to predict the load-slip response of a stud. The reliability and accuracy of the proposed load-slip equation was verified by the experimental and numerical load-slip curves.

关键词： ultra-high performance concrete studs shear strength FE analysis push-out test

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Effect of Different Connectors on Concrete Composite Box-Girders with Corrugated Steel Webs

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Journal of Harbin Institute of Technology(New Series) 2018年第2期25卷 73-84页

作者： Yanqiu Lu Beijing Capital Highway Development Group Co. Ltd. Dept of Civil Engineering Tsinghua University

In order to resolve affecting of Different Shear Connectors(the perfobond leisten(PBL) shear connectors and stud shear connectors) on the M echanical Properties of Prestressed Concrete Composite BoxGirders with Corrugated Steel Webs,Some mechanical properties of Prestressed Concrete Composite BoxGirder with Corrugated Steel Webs were researched by conducting experiments on two specimens with PBL shear connectors and stud shear connectors relating to ultimate bearing capacity,the flexural stiffness,crack resistance properties and the efficiency of prestressing being introduced to the girder,etc. The test results show ed that,relative to the stud shear connectors,PBL shear connectors can greatly improve some structural performance qualities of prestressed concrete composite box-girders with corrugated steel webs,such as the ultimate bearing capacity,the flexural stiffness and the crack resistance property,but when the efficiency of prestressing is introduced into the girder,the PBL shear connectors do not perform as well as stud shear connectors.

关键词： studs PBL ultimate bearing capacity efficiency of prestressing introduced flexural stiffness crack resistance property

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In-Plane Shear Performance of Wood-Framed Drywall Sheathing Wall Systems under Cyclic Racking Loading

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Open Journal of Civil Engineering 2014年第1期4卷 54-70页

作者： Ali M. Memari Ryan L. Solnosky Department of Architectural Engineering The Pennsylvania State University University Park USA Department of Architectural Engineering The Pennsylvania State University University Park USA Department of Civil and Environmental Engineering The Pennsylvania State University State College USA

A pilot study was conducted at Penn State University to determine whether the type of drywall joint compound would influence the shear strength of wood-frame stud walls sheathed with Gypsum Wall Board (GWB or drywall). In this study, five 2438 mm by 2438 mm specimens were tested under in-plane cyclic racking loading following the CUREE loading protocol for light-frame wall systems. Three specimens were finished using non-cement based joint compound while the other two used cement based joint compound. Based on the experimental testing of the specimens, the results show that the use of cement based joint compound on drywall joints produces higher shear capacity for the wall system as compared to similar specimens finished with conventional non-cement based joint compound. The result of the study is particularly important for high seismic regions where interior stud walls in residential construction effectively take part in seismic resistance even though wood shear walls are normally used on exterior walls.

关键词： Frames Wood Structures studs Shear Walls Gypsum Lateral Loads Residential

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