基于易损性曲线的RC桥墩地震损伤评估

Seismic damage assessment of reinforced concrete piers based on vulnerability curves

为评估地震作用下钢筋混凝土(RC)桥墩的损伤程度,基于墩顶水平位移的损伤指标,提出了一种新的基于易损性曲线的地震损伤评估方法.建立非线性有限元分析模型,利用IDA增量动力分析得到损伤指标与PGA之间的对数线性关系,并由此获得了不同地震动强度下RC桥墩的易损性曲线.研究表明:本文所提出的地震损伤评估方法计算简单,能够有效地评估RC桥墩在不同地震动强度下的破坏状态,为震后RC桥墩的安全评估与加固提供了理论依据.

In order to study the damage of reinforced concrete piers under earthquake,the paper establishes a damage index based on the horizontal displacement of pier top,and proposes a seismic damage assessment method based on vulnerability curves.The nonlinear finite element analysis model is established,which can help to get a log linear relationship between the damage index and the PGA using the methods of incremental dynamic analysis(IDA),then the vulnerability curves of reinforced concrete piers under different earthquake intensity are obtained.Results show that the proposed seismic damage assessment method for reinforced concrete piers is simple in calculation,and it can be used to evaluate the damage of reinforced concrete piers under different earthquake intensity,which provides a theoretical basis for the safety evaluation and reinforcement of the RC bridge piers.