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Seismic retrofitting design method for steel CBFs based on the energy-ductility model
Abstract A simplified seismic retrofitting method uses only one parameter (equivalent energy) instead of multiple parameters (strength and stiffness) was presented. Reserve parameters, including reserve strength and reserve stiffness, of BRBFs were developed. The relationship between the equivalent energy (E) and the reserve parameters was established. The ductility responses (μ) of the BRBF and CBF structures under a series of ground motions were calculated and compared. All acceptable parametric combinations of the BRBF for CBF retrofitting were obtained by taking the ductility response of the BRBF less than that of the CBF as the criterion. Then, the equivalent energy and ductility response were combined, and the results were fitted as the E-μ model, which is an easy-to-use equation. The seismic reinforcement design method of CBFs retrofitted with BRBs based on the E-μ model was proposed, which is a direct method without any nonlinear time-history analysis. Finally, the method was applied to a 6-story retrofitted braced frame structure project, and the results showed that the method proposed in this paper is accurate and applicable in seismic retrofitting design.
Highlights The reserve parameters and ductility demand spectra of BRBF were established. The seismic performance of BRBF influenced by the reserve parameters was analyzed. A simplified method of reinforced design of CBF based on the E-μ model was proposed.
Seismic retrofitting design method for steel CBFs based on the energy-ductility model
Abstract A simplified seismic retrofitting method uses only one parameter (equivalent energy) instead of multiple parameters (strength and stiffness) was presented. Reserve parameters, including reserve strength and reserve stiffness, of BRBFs were developed. The relationship between the equivalent energy (E) and the reserve parameters was established. The ductility responses (μ) of the BRBF and CBF structures under a series of ground motions were calculated and compared. All acceptable parametric combinations of the BRBF for CBF retrofitting were obtained by taking the ductility response of the BRBF less than that of the CBF as the criterion. Then, the equivalent energy and ductility response were combined, and the results were fitted as the E-μ model, which is an easy-to-use equation. The seismic reinforcement design method of CBFs retrofitted with BRBs based on the E-μ model was proposed, which is a direct method without any nonlinear time-history analysis. Finally, the method was applied to a 6-story retrofitted braced frame structure project, and the results showed that the method proposed in this paper is accurate and applicable in seismic retrofitting design.
Highlights The reserve parameters and ductility demand spectra of BRBF were established. The seismic performance of BRBF influenced by the reserve parameters was analyzed. A simplified method of reinforced design of CBF based on the E-μ model was proposed.
Seismic retrofitting design method for steel CBFs based on the energy-ductility model
Dong, Zhi-Qian (author) / Li, Gang (author) / Xu, Shi-Ting (author)
2022-10-04
Article (Journal)
Electronic Resource
English
Remarks on Seismic Design Rules of EC8 for Inverted-V CBFs
| Trans Tech Publications | 2018