The wall–frame and the steel–concrete interactions in composite shear walls

Abstract

The nonlinear pushover analyses of 24 composite steel plate shear walls (CSPSWs), 24 corresponding steel plate shear walls (SPSWs), and 24 corresponding frames are conducted. CSPSWs have different aspect ratios and infill steel plate thicknesses. The study aims to understand the wall-frame and steel-concrete interactions. The infill steel plate thickness and aspect ratio of CSPSW are the main parameters of the study.In CSPSWs, the percentage of absorbed shear forces by the infill composite wall is always greater than the infill plate of its corresponding SPSW. The percentage of shear in the composite wall is constant at the initial stage of loading up to a drift of 0.15-0.2%. By increasing the drift, the shear yielding of steel plate leads to a reduction of the shear force absorption. The reduction continues until the bulk of shear stiffness of CSPSW is provided by the frame.At the beginning of lateral loading, steel-concrete interactions increase until shear yield of steel plate. Following this stage, a sudden decrease takes place in shear force absorption of reinforced concrete (RC) panel. The reason is that, at the lower drifts, the steel plate has a tendency for elastic buckling, which is prevented by the RC panel. Finally, the shear force absorption remains approximately constant in the RC panel. KEYWORDS composite steel plate shear wall, concrete stiffened steel plate shear wall, finite element method, nonlinear behavior, steel plate shear wall 1 | INTRODUCTION The steel plate shear wall (SPSW) and composite steel plate shear wall (CSPSW) are acceptable lateral-load resistance systems for tall steel structures. CSPSW can be efficiently used in regions with high seismicity. The system configuration consists of an infill steel plate and a reinforced concrete (RC) panel on one or both sides of the steel plate. The RC panel is attached to the steel plate by mechanical shear connectors, bolts, or studs.There is a gap between the RC panel and the frame, so that the RC panel does not provide shear strength and only acts as a stiffener. [1][2][3][4][5][6][7][8][9][10] The composite SPSW with an RC panel on one side, with steel boundary elements, is denoted as "concrete stiffened steel plate shear wall," in the AISC Seismic Provisions. [11] Many numerical and experimental investigations have been conducted to understand behavior and design of SPSWs for the past decades. [12][13][14][15] Previous studies show that SPSWs provide high strength and ductility for high-rise buildings; however, the infill steel plate of SPSW buckles globally in low drift. Therefore, the problem encourages researchers to study behavior and design of stiffened SPSW.Zhao and Astaneh-Asl tested two half-scale CSPSW specimens-with and without gaps between steel boundary elements and the RC panel-in 2002. [8,9] The innovative CSPSW showed a proper ductile manner and less damage to the RC panel as compared with the CSPSW without gaps.The innovative CSPSW resisted the lateral load up to an interstory drift of 5%; however, before reaching this drif...

Steel–concrete composite shear walls using precast high performance fiber reinforced concrete panels

“…Finite element model of CSPSW was developed . Commercially available finite element software program, ABAQUS, was used in order to conduct nonlinear finite element push‐over analysis.…”

“…A frictionless hard contact was defined between the infill steel plate and concrete panel. More details about the finite element method of CSPSW can be found in previous works . Figure illustrates comparisons of finite element results with the test data of the CSPSW specimens.…”

“…It can be used in a region of high seismic hazard. The system is composed of a composite infill wall—a steel plate and a reinforced concrete panel—and steel boundary elements—beams and columns . The reinforced concrete panel is attached to one side of the infill steel plate by shear connectors and precludes the overall and local elastic buckling of the infill steel plate .…”

“…There is a gap between the concrete panel and the steel boundary elements; therefore, the reinforced concrete panel works as a stiffener. It ensures the shear yielding of the infill steel plate by preventing its elastic buckling . In accordance with the American Institute of Steel Construction (AISC) Seismic Provisions, limited research has been conducted on this kind of shear walls.…”

Concrete panel thickness demand for the design of composite steel plate shear wall

“…Most of investigations of C‐SPWs focus mainly on their seismic behavior. Such investigations were performed by Zhao and Astaneh‐Asl on the cyclic behaviors of traditional and innovative C‐SPWs, Rahai and Hatami on the effect of stud spacing on the seismic performance of C‐SPWs, Shafaei et al on the influence of concrete panel thickness and boundary frame on the behavior of C‐SPWs, Guo et al on the response of C‐SPWs in composite frames under cyclic loading, and Rassouli et al on the seismic performance of C‐SPWs with light‐weight concrete panels . Other types of composite steel‐concrete shear walls with construction similar to C‐SPWs have also been reported.…”