A Numerical Study on Nonlinear Response of Steel Plate Shear Wall Systems by Using Strip Model

چکیده مقاله

Steel Plate Shear Wall (SPSW) is made from thin steel plates which in turn are framed by the beams and columns of structural system. In recent year they are proved to be very effective and economical for resisting lateral loads such as earthquake and wind loads [1, 2]. Steel plate shear walls (SPSWs) have become more and more popular in recent years because of their potential huge energy dissipation capacity and ductility under lateral loads [3]. Due to their low cost and fast construction, SPSWs have potential application in practice. Now, in many countries such as America, Canada, England, Japan and Mexico for the construction of new buildings or renovation of old buildings benefit from this system. In this paper, strip method (see Figure 1) is presented for SPSW modeling due to its relative simplicity and minimal computational effort in order to conduct nonlinear static pushover analysis [1, 4]. The computational model was developed using the OpenSees finite element software [5]. To verify the modeling approach’s adequacy for representing the response of SPSWs, the four-story SPSW tested by Driver et al. under quasi-static cyclic loading was modeled and analyzed [6]. As shown in Figure 2, gravity loads of 720 kN were applied at the top of each vertical boundary element, consistent with the testing. The testing used equal lateral loads applied at each story so a uniform load pattern was used in the cyclic nonlinear static analysis. Analysis results are compared with the experimental results in Figure 3, which show base shear versus first story displacement respectively. As shown, the model adequately represents the global force–displacement of the SPSW specimen. After verification of the strip model, parametric studies have been carried out to consider several aspects in the nonlinear behavior of SPSWs. Thus, a number of SPSWs with different ratio of span length to panel height and also different panel height to wall thickness ratio were designed on the basis of AISC regulations [7] and their nonlinear response using the strip model are discussed. It was found that code designed SPSWs are capable of meeting drift limitations and the response modification factor, R, adequately approximated comparing to the value proposed by the AISC design code.