【摘要】：為探討非規(guī)則橋梁的抗震性能,建立了典型非規(guī)則公路橋梁的地震易損性理論模型.考慮橋梁結(jié)構(gòu)參數(shù)和地震動(dòng)的不確定性,抽樣生成橋梁地震易損性分析模型樣本庫.用Open Sees軟件對(duì)模型樣本庫進(jìn)行非線性動(dòng)力時(shí)程分析,以獲得結(jié)構(gòu)動(dòng)力響應(yīng).在研究橋墩反彎點(diǎn)時(shí)程曲線和橋墩曲率包絡(luò)線分布特征的基礎(chǔ)上確定橋梁構(gòu)件的損傷指標(biāo).采用概率地震需求分析方法獲得橋梁各構(gòu)件易損性曲線,并基于一階可靠度理論獲得橋梁系統(tǒng)的易損性曲線.結(jié)果表明:在地震作用下,非規(guī)則橋梁支座最容易損傷破壞,橋梁系統(tǒng)的易損性明顯高于橋梁構(gòu)件的易損性;易損性曲線可用于評(píng)估非規(guī)則橋梁的抗震性能,為震后橋梁損傷識(shí)別提供依據(jù).
[Abstract]:In order to study the seismic behavior of irregular bridges, a theoretical model of seismic vulnerability of typical irregular highway bridges is established. Considering the uncertainty of bridge structure parameters and ground motion, a sample library of bridge seismic vulnerability analysis model is generated by sampling. The nonlinear dynamic time history analysis of the model sample library is carried out by using Open Sees software to obtain the dynamic response of the structure. The damage index of bridge members is determined on the basis of studying the time-history curve of pier reverse bending point and the distribution of curvature envelope of pier. The vulnerability curves of bridge components are obtained by using probabilistic seismic requirement analysis method, and the vulnerability curves of bridge systems are obtained based on the first-order reliability theory. The results show that the irregular bridge supports are most vulnerable to damage under earthquake, and the vulnerability of bridge system is obviously higher than that of bridge components. The vulnerability curve can be used to evaluate the seismic performance of irregular bridges and provide the basis for damage identification of post-earthquake bridges.
【作者單位】： 西南交通大學(xué)土木工程學(xué)院;
【基金】：國家973計(jì)劃資助項(xiàng)目(2013CB036300-2) 國家自然科學(xué)基金資助項(xiàng)目(51078316) 四川省科技計(jì)劃資助項(xiàng)目(2011JY0032) 鐵路科技研究開發(fā)計(jì)劃項(xiàng)目(2011G026-E,2012G013-C)
【分類號(hào)】：U448.23;U442.55

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