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Theoretical and Experimental Study on Critical Separation Distance of Adjacent Buildings Based on Seismic Pounding Fragility
Existing procedures for determining the minimum separation distance between adjacent buildings are based on the approximations of the peak relative horizontal displacement of the buildings, which are characterized by unknown pounding probabilities. The present study proposes a probabilistic performance-based procedure for determining the critical separation distance (CSD) between adjacent buildings exhibiting linear elastic behavior. Pounding events are expressed in the form of single-barrier first-passage reliability problems according to the performance-based seismic design theory. With the random vibration theory, the nongeometric spectral characteristics of the relative displacement response of adjacent buildings are deduced, and the approximate analytical solutions of the seismic pounding fragility are obtained, employing analytical approximations. Based on the seismic pounding fragility of adjacent buildings, the calculation of CSD is described as an inverse reliability problem, and the specific CSDs corresponding to a target probability of pounding during the design life of the given adjacent buildings are derived by a proposed piecewise fitting iterative search algorithm. The proposed procedure is applied to several different buildings modeled as linear elastic single-degree-of-freedom (SDOF) and multidegree-of-freedom (MDOF) systems. Referencing to the importance sampling using elementary events (ISEE) method, the accuracy and efficiency of the proposed methodology are verified. Furthermore, the results obtained based on the proposed procedure are validated against shaking table test results.
Theoretical and Experimental Study on Critical Separation Distance of Adjacent Buildings Based on Seismic Pounding Fragility
Existing procedures for determining the minimum separation distance between adjacent buildings are based on the approximations of the peak relative horizontal displacement of the buildings, which are characterized by unknown pounding probabilities. The present study proposes a probabilistic performance-based procedure for determining the critical separation distance (CSD) between adjacent buildings exhibiting linear elastic behavior. Pounding events are expressed in the form of single-barrier first-passage reliability problems according to the performance-based seismic design theory. With the random vibration theory, the nongeometric spectral characteristics of the relative displacement response of adjacent buildings are deduced, and the approximate analytical solutions of the seismic pounding fragility are obtained, employing analytical approximations. Based on the seismic pounding fragility of adjacent buildings, the calculation of CSD is described as an inverse reliability problem, and the specific CSDs corresponding to a target probability of pounding during the design life of the given adjacent buildings are derived by a proposed piecewise fitting iterative search algorithm. The proposed procedure is applied to several different buildings modeled as linear elastic single-degree-of-freedom (SDOF) and multidegree-of-freedom (MDOF) systems. Referencing to the importance sampling using elementary events (ISEE) method, the accuracy and efficiency of the proposed methodology are verified. Furthermore, the results obtained based on the proposed procedure are validated against shaking table test results.
Theoretical and Experimental Study on Critical Separation Distance of Adjacent Buildings Based on Seismic Pounding Fragility
Wu, Qiao-Yun (author) / He, Wan-Cheng (author) / Wei, Min (author) / Zhu, Hong-Ping (author)
2019-09-30
Article (Journal)
Electronic Resource
Unknown
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