مهندسی عمران شریف (May 2019)
REHABILITATION ASSESSMENT OF REINFORCED CONCRETE FRAME WITH STEEL PLATE SHEAR WALLS DUE TO DIFFERENT CONNECTION METHODS
Abstract
In recent years, the use of thin Steel Plate Shear Walls (SPSWs), for rehabilitation of existing reinforced concrete (RC) structures has increased due to their significant resistance, stiffness, ductility, and energy dissipation capacity. The main issue in the rehabilitation of RC structures with SPSWs, is the necessity of the existence of a suitable connection between SPSW and the RC frame (RCF), so that the tension field of SPSWs can well be transferred to the RCF and steel infill plate capacity can well be used. In this study, different proposed connections between SPSW and RCF are studied.After the verification of the experimental specimen, one- span three-story special RCF with SPSW with one-third scale, specimens were modeled by the proposed connections. Four types of connection were investigated for connecting the steel infill plate to RCF. All specimens were analyzed by non-linear static analysis. Parametric studies were performed to achieve an optimum connection. The parameters include using bolts in columns and beams, thickness of plate connections, using the angle profiles in the corner columns and size of angle profiles connected to steel infill plates.Based on the modeling results, a comparison of the values of the ductility, elastic stiffness, energy dissipation capacity, and load-carrying capacities of specimens with different connections, indicated a significant increase in the values of initial RCF. Increasing the thickness of the plates connected to beams and columns and the growing use of the angle profiles in the corner columns improve the performance of the connections; however, do not lead to a considerable increase in resistance and non-economic causes of the connection. By comparing the performances of different connections, an appropriate connection was proposed. Based on the results of all specimens, response modification coefficient and over strength factor of special RCF with thin SPSW were estimated at 8.37 and 2, respectively, as compared with the values of the proposed the ASCE 7-10, for dual system of special steel frame with SPSW.
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