基于桥梁经验数据的理论易损性曲线校准

发布时间：2018-05-07 13:14

本文选题：桥梁 + 抗震性能　；参考：《应用数学和力学》2014年07期

【摘要】：基于理论计算或试验研究定义桥梁损伤状态建立的理论易损性曲线,通常不能将桥梁构造(包括几何性质、材料性质等)、地面运动和场地条件等因素均考虑在内.鉴于此,为更加精确地以易损性曲线的形式评估桥梁抗震性能,首先利用1994年北岭地震桥梁损伤数据建立双参数对数正态分布的经验易损性曲线;其次,给出一种多跨桥梁力学模型,定义桥墩柱转动延性值量化桥梁损伤状态,获得4种损伤状态下的理论易损性曲线;最后,以90%置信区间的经验易损性曲线对理论易损性曲线进行校准.计算结果表明:利用桥梁力学模型建立的理论易损性曲线校准后能近似吻合经验易损性曲线,且3种损伤状态阈值由SRSS优化公式得到校准.随着结构损伤知识的进展,未来可利用更详细的结构损伤过程对校准后的理论易损性曲线做二次更新,进一步提高桥梁系统风险评估的精确性,尤其是遭受强震灾害下由多座桥梁组成的高速公路网络.
[Abstract]:On the basis of theoretical calculation or experimental study, the theoretical vulnerability curve of bridge damage state is defined, which usually can not take into account the factors of bridge construction (including geometric properties, material properties, ground motion and site conditions). In view of this, in order to evaluate the seismic performance of bridges more accurately in the form of vulnerability curves, the empirical vulnerability curve of two-parameter logarithmic normal distribution is established by using the damage data of the bridge during the 1994 Beiling earthquake. In this paper, a mechanical model of multi-span bridge is presented, and the rotational ductility of pier column is defined to quantify the damage state of the bridge, and the theoretical vulnerability curves under four kinds of damage states are obtained. The theoretical vulnerability curve is calibrated with the empirical vulnerability curve of 90% confidence interval. The calculated results show that the theoretical vulnerability curves established by the bridge mechanics model can approximate agree with the empirical vulnerability curves after calibration, and the three damage state thresholds are calibrated by the SRSS optimization formula. With the development of structural damage knowledge, in the future, more detailed structural damage process can be used to update the calibrated theoretical vulnerability curve to further improve the accuracy of bridge system risk assessment. Especially the highway network composed of many bridges under the strong earthquake disaster.
【作者单位】：西北工业大学力学与土木建筑学院;
【基金】：国家自然科学基金(51278420)~~
【分类号】：U442.55

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