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Modified response spectrum analysis to compute shear force in tall RC shear wall buildings
Highlights Two MRSA methods to compute shear forces with a method to compute strains are proposed. Accuracy of RSA and MRSA is evaluated by NLRHA using six tall buildings. RSA well estimates displacements and drifts but underestimates shear forces. MRSA can well estimate shear forces from NLRHA. The proposed method to compute strains provides good agreement with results from NLRHA.
Abstract Among various analysis methods, response spectrum analysis (RSA) is widely used to compute design forces of structures subjected to earthquake loading. Previous studies indicate that using a single response modification factor (R) to reduce elastic forces contributed from all modes in the RSA procedure is the primary cause for underestimating the design force demands on structures. In this paper, two modified response spectrum analysis (MRSA) methods, based on a higher-mode elastic approach and based on a higher-mode inelastic approach are proposed for computing design shear forces in tall reinforced concrete (RC) shear wall buildings. Here 15-, 20-, 31-, and 39-story tall buildings subjected to earthquake excitations in Bangkok are first designed using the RSA procedure, and then nonlinear response history analysis (NLRHA) is carried out. It is found that the RSA procedure provides good estimates for floor displacements and story drift ratios, but significantly underestimates force demands, when compared with NLRHA. The method provides good estimates of shear force for the 15- and 20-story buildings and conservative estimates for the 31- and 39-story buildings; while the method provides good estimates for all cases. However, requires a nonlinear inelastic structural model but does not. In both MRSA methods, the bending moment demands are computed in the same way as the conventional RSA procedure, with ductile detailing in RC walls or columns required at locations where the combined axial and bending strain exceeds a certain limit. In order to determine the locations that require ductile detailing in RC walls or columns, a novel method based on the equal displacement concept using strain from elastic analysis to predict inelastic strain is found to provide good agreement with inelastic strain computed from NLRHA.
Modified response spectrum analysis to compute shear force in tall RC shear wall buildings
Highlights Two MRSA methods to compute shear forces with a method to compute strains are proposed. Accuracy of RSA and MRSA is evaluated by NLRHA using six tall buildings. RSA well estimates displacements and drifts but underestimates shear forces. MRSA can well estimate shear forces from NLRHA. The proposed method to compute strains provides good agreement with results from NLRHA.
Abstract Among various analysis methods, response spectrum analysis (RSA) is widely used to compute design forces of structures subjected to earthquake loading. Previous studies indicate that using a single response modification factor (R) to reduce elastic forces contributed from all modes in the RSA procedure is the primary cause for underestimating the design force demands on structures. In this paper, two modified response spectrum analysis (MRSA) methods, based on a higher-mode elastic approach and based on a higher-mode inelastic approach are proposed for computing design shear forces in tall reinforced concrete (RC) shear wall buildings. Here 15-, 20-, 31-, and 39-story tall buildings subjected to earthquake excitations in Bangkok are first designed using the RSA procedure, and then nonlinear response history analysis (NLRHA) is carried out. It is found that the RSA procedure provides good estimates for floor displacements and story drift ratios, but significantly underestimates force demands, when compared with NLRHA. The method provides good estimates of shear force for the 15- and 20-story buildings and conservative estimates for the 31- and 39-story buildings; while the method provides good estimates for all cases. However, requires a nonlinear inelastic structural model but does not. In both MRSA methods, the bending moment demands are computed in the same way as the conventional RSA procedure, with ductile detailing in RC walls or columns required at locations where the combined axial and bending strain exceeds a certain limit. In order to determine the locations that require ductile detailing in RC walls or columns, a novel method based on the equal displacement concept using strain from elastic analysis to predict inelastic strain is found to provide good agreement with inelastic strain computed from NLRHA.
Modified response spectrum analysis to compute shear force in tall RC shear wall buildings
Khy, Kimleng (author) / Chintanapakdee, Chatpan (author) / Warnitchai, Pennung (author) / Wijeyewickrema, Anil C. (author)
Engineering Structures ; 180 ; 295-309
2018-11-09
15 pages
Article (Journal)
Electronic Resource
English
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