【摘要】：針對目前我國近海隔震橋梁抗震性態(tài)指標量化的研究現(xiàn)狀,引入基于性態(tài)的抗震設計思想,利用Pushover分析方法建立量化指標限值。給出近海隔震橋梁的性態(tài)水準合理劃分,選取位移延性比和支座剪應變作為量化指標,利用公式法和Pushover法計算量化指標限值。選取3條天然地震波對近海隔震橋梁進行增量動力時程分析,得到結構在不同PGA作用下的位移響應。根據(jù)不同強度地震動作用下墩頂位移和支座變形情況,與本文計算的性態(tài)指標限值進行比較分析。研究結果表明:對于低墩橋梁,公式法計算量化指標限值相較于Pushover法偏小,采用Pushover法能合理地確定性態(tài)指標,可為近海隔震低墩橋梁性態(tài)設計和易損性分析提供可行的量化分析方法。
[Abstract]:In view of the present research situation of seismic behavior index quantification of offshore isolated bridges in China, the seismic design idea based on behavior is introduced, and the quantitative index limit value is established by Pushover analysis method. The reasonable division of behavior level of offshore isolated bridge is given. The displacement ductile ratio and bearing shear strain are selected as quantitative indexes, and the formula method and Pushover method are used to calculate the limit value of quantitative index. Three natural seismic waves are selected to analyze the incremental dynamic time history of offshore isolated bridges, and the displacement responses of structures under different PGA are obtained. According to the displacement of pier top and the deformation of support under different intensity ground motion, the limit value of performance index calculated in this paper is compared and analyzed. The results show that for low pier bridges, the limit value of quantitative index calculated by formula method is smaller than that by Pushover method, and the Pushover method can reasonably determine the performance index. It can provide a feasible quantitative analysis method for the behavior design and vulnerability analysis of offshore isolated low pier bridges.
【作者單位】： 廣州大學;廣州大學工程抗震研究中心;
【基金】：國家重點基礎研究發(fā)展計劃973項目(2011CB013606) 國家自然科學基金高鐵聯(lián)合基金重點項目(U1334209)
【分類號】：U442.55

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相關期刊論文 前7條

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本文編號：2493467