桥梁结构地震损伤评估简化分析方法

Simplified Methods for Seismic Damage Assessment of Bridges

为了更好地解决如何衡量地震作用下桥梁结构遭受的损伤程度的问题,文章对滞回模型屈服后刚度系数和P-Delta效应的对动力响应的影响进行了分析。提出用残留位移作为评估桥梁结构损伤的附加指标.对典型桥梁结构进行实例分析.在桥梁抗震性能评估中考虑P-Delta效应的分析中引入残留位移是必要的,也是有效的.

To evaluate the seismic behavior and damage of bridge structures subjected to strong ground motion with reliable accuracy, analysis model is generally recommended. For lifeline structures, highway bridges, it is essential that residual displacement after an earthquake be smaller than the acceptable maximum value so that the bridges can be repaired. Both the maximum displacement and the residual displacement are important in seismic design. Damage indices available in the literature, either based on ductility, energy dissipation or a combination of both are discussed. The concept of residual deformation as a critical complementary indicator to cumulative damage is introduced in the paper. This paper describes analyses of a typical bridge, with different hysteretic characteristics, post-yielding stiffness as affect by P-Delta effects, as well as maximum ductility are found to influent residual deformations greatly. Some important problems are discussed.