【摘要】：將不同場地類別和震源機制上的118條近斷層地震記錄進行分類,基于基礎隔震結(jié)構(gòu)的雙自由度體系簡化模型,利用狀態(tài)空間法及四階龍格-庫塔法對結(jié)構(gòu)的彈塑性反應譜進行求解,研究了場地類別和震源機制對反應譜頻譜特性的影響。通過分析近斷層地震記錄的3個強度指標與基礎隔震結(jié)構(gòu)最大彈塑性響應的相關性,探討了基礎隔震結(jié)構(gòu)地震反應分析時強度指標的選取問題。結(jié)果表明,三種場地類別條件中,速度反應譜規(guī)律不明顯,但逆斷層地震動的平均加速度反應譜和逆斜斷層地震動的平均位移反應譜均最大。場地類別和震源機制不同,地震動強度指標與結(jié)構(gòu)響應的相關程度不同。因此在進行近斷層脈沖型地震動作用下基礎隔震結(jié)構(gòu)地震反應分析時,建議考慮結(jié)構(gòu)所在場地及地震動的震源機制后采用不同地震動強度指標來選擇和調(diào)整地震動輸入。
[Abstract]:118 near-fault seismic records of different site types and focal mechanisms are classified, and the simplified model of two-degree-of-freedom system for base-isolated structures is presented. The state space method and the fourth order Runge-Kutta method are used to solve the elastoplastic response spectrum of the structure. The effects of site type and focal mechanism on the spectral characteristics of the response spectrum are studied. Based on the analysis of the correlation between the three strength indexes of near-fault seismic records and the maximum elastic-plastic response of base-isolated structures, the selection of strength indexes in seismic response analysis of base-isolated structures is discussed. The results show that the law of velocity response spectrum is not obvious, but the average acceleration response spectrum and the average displacement response spectrum of inverse fault ground earthquake are the largest. The correlation between seismic intensity index and structural response is different with different site types and focal mechanisms. Therefore, in the seismic response analysis of base-isolated structures under the action of near-fault impulse ground motion, it is suggested to select and adjust the seismic input after considering the location of the structure and the focal mechanism of the ground motion.
【作者單位】： 蘭州理工大學防震減災研究所;蘭州理工大學西部土木工程防災減災教育部工程研究中心;
【基金】：教育部長江學者創(chuàng)新團隊項目(IRT13068) 國家自然科學基金(51578274)
【分類號】：TU352.1

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