Abstract
The safety and cost of structures composed of concrete-filled steel tube (CFST) frame-steel plate shear walls (SPSWs) with two-side connections are governed by the seismic performance. The response modification factor R and displacement amplification factor Cd are important seismic performance factors. In this paper, nonlinear seismic responses of 10-story, 15-story, and 20-story CFST frame-SPSWs (CFST-SPSWs) are studied. A nonlinear finite element model which includes both material and geometric nonlinearities is developed using the finite element software OpenSees for this study. The accuracy of model was validated by comparing with experimental results. Nonlinear seismic analysis shows that CFST-SPSWs, in high seismic region, behave in a stable and ductile manner. Also, R and Cd of CFST-SPSWs were evaluated for the structure models using incremental dynamic analysis (IDA), and the average values of 3.17 and 3.05 are recommended, respectively. The recommended R value is greater than the value (2.8) in the “Chinese Code for seismic design of buildings” for composite structures, indicating the code is conservative. The structural periods provided by current code are generally lower than the periods calculated by finite element analysis. Research results show that R and Cd increase with increasing story number, span number, and structural period. Ductility reduction factor Rμ increases with increasing span number and decreasing story number. Overstrength factor Rs increases with increasing story number and decreasing span number.
Highlights
Increasing material strength and deformation properties and using composite structures are two effective methods of improving the seismic performance of building structures [1]
In order to ensure structures into inelastic phase, seismic action in design is determined by reducing the elastic seismic force using the response modification factor R for structural seismic acceleration (“moderate earthquake” in Chinese seismic fortification intensity). e R is governed by structural overstrength performance, ductility, and energy dissipation. e structural inelastic degree depends directly on a reduced seismic force, and reduction factor values are concerned with seismic action in design
Evaluating structural response modification factor systematically in a composite structural system of concrete-filled steel tubular (CFST) frame-steel plate shear walls (SPSWs) will improve the seismic design and economy of engineering structures. e influence of story number, span number, and structural period on structural response modification factor R, ductility reduction factor Rμ, overstrength factor Rs, and displacement amplification factor Cd is analyzed. e reasonable values are presented for the CFST frame-SPSWs to provide a base value for the corresponding code
Summary
Increasing material strength and deformation properties and using composite structures are two effective methods of improving the seismic performance of building structures [1]. E structural response modification factor values from various seismic codes around the world are different. E response modification factors of steel moment-resisting frames were calculated using different pushover analysis methods [10]. E response modification factors of X-braced steel frames with different boundary conditions were calculated using pushover analysis methods using Sap2000 software [11]. Literature review shows that the structural response modification factors of reinforced concrete and steel frame structure were studied. The research regarding the CFST frame-SPSW response modification factor was limited [28, 29] To answer this question, the seismic performance of CFST frame-SPSWs is evaluated using the IDA method in this paper. Evaluating structural response modification factor systematically in a composite structural system of CFST frame-SPSWs will improve the seismic design and economy of engineering structures. Evaluating structural response modification factor systematically in a composite structural system of CFST frame-SPSWs will improve the seismic design and economy of engineering structures. e influence of story number, span number, and structural period on structural response modification factor R, ductility reduction factor Rμ, overstrength factor Rs, and displacement amplification factor Cd is analyzed. e reasonable values are presented for the CFST frame-SPSWs to provide a base value for the corresponding code
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