基于材料强度既有统计参数的梁桥地震易损性简化分析方法

发布时间：2018-06-15 12:58

本文选题：材料强度 + 统计参数　；参考：《振动与冲击》2017年14期

【摘要】：为了研究简化的地震易损性方法在桥梁中的应用,通过寻求材料不确定性的统计规律,达到简化易损性分析的目的,提出了两种易损性简化分析方法。针对我国实际工程中应用最为广泛的某梁式桥梁,采用拉丁超立方抽样来进行结构材料不确定性组合,对桥梁的三维有限元模型,选用了10条天然地震动,利用结构主要材料既有的统计规律,对比研究了两种易损性简化分析与常规基于位移的地震易损性分析方法的计算结果。研究结果表明:采用简化分析方法一得到的桥梁结构地震需求超过其性能水平的超越概率要小于常规基于位移的地震易损性分析方法的计算结果,其结果偏于不安全,而且有一定的误差;采用简化方法二绘制的易损性曲线比简化方法一绘制的易损性曲线更接近常规方法的,其误差更小,其分析结果偏于安全;采用简化分析方法之二,将大幅减少分析样本数量,在实际工程中可以用来对桥梁结构地震破坏状态概率进行近似估计。
[Abstract]:In order to study the application of simplified seismic vulnerability method in bridges, two simplified methods of vulnerability analysis are proposed by seeking the statistical rules of material uncertainty and achieving the purpose of simplifying vulnerability analysis. Aiming at a beam type bridge which is widely used in practical engineering in our country, Latin hypercube sampling is used to combine the uncertainty of structural materials. Ten natural ground motions are selected for the 3D finite element model of the bridge. Based on the existing statistical laws of main structural materials, the results of two simplified vulnerability analysis methods and conventional displacement-based seismic vulnerability analysis methods are compared and studied. The results show that the transcendental probability of the bridge structure whose seismic demand exceeds its performance level is smaller than that of the conventional displacement-based seismic vulnerability analysis method, and the results are more unsafe. Moreover, there is a certain error; the vulnerability curve drawn by simplified method 2 is more similar to that drawn by simplification method, its error is smaller, and the analysis result is more safe. The number of analysis samples will be greatly reduced, which can be used to approximate the probability of seismic failure state of bridge structure in practical engineering.
【作者单位】：广西交通科学研究院有限公司;广西翔路建设有限责任公司;广州大学土木工程学院;
【基金】：973计划(2011CB013606) 广西科技攻关项目(桂科攻13550008-2)
【分类号】：U442.55

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