Calculate the main rotation time of the composite steel shear wall and examine the effect of the crater and the thickness of the concrete coating on it.

Document Type : Original Article

Authors

1 semnan university

2 Associate Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran

Abstract

A Composite Steel Plate Shear Wall (CSPSW) consists of an infill steel plate and a reinforced concrete panel attached to one side or both sides by shear studs. CSPSW is a lateral resisting system primarily used to resist wind and seismic forces. In a steel plate shear wall, the story shear is carried by the tension field action of the steel plate after buckling of diagonal compression. Meanwhile, In a CSPSW, concrete panels prevent the out-of-plane buckling of thin-walled steel plate, thus significantly increasing the load-bearing capacity the wall. One of the main parameters for seismic design of structures is the fundamental natural period. In this paper, the fundamental period of the structures with CSPSW by an analytical method has been presented. Following this, 27 numerical models were categorized three types including low-rise building, mid-rise building and tall building with 6, 12 and 18 stories, respectively. Furthermore, the considered models were in three displacement modes including moment, shear and moment-shear modes. CSPSWs were in the span widths of 1.5, 3 and 4 m, and also concrete panel thicknesses were including 30, 40 and 50 mm in one side of steel plate. To compute the fundamental natural period of the models, ABAQUS software was employed. The results indicated that the numerical period has a good compatibility with the computional period based on moment-shear analytical method. Therefore, the proposed relations in this paper are suitable. Also, the fundamental period of the structures was decreased up to 15% by increasing the span width of CSPSW. Meanwhile, concrete panel thickness didn't have remarkable effect on the fundamental period. Finally, it seems that the proposed relations by Iranian seismic design code (Standard 2800) and seismic codes in the world are valid for determining fundamental periods of structures with CSPSW.

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