Deformation Hazard Curves for Development of Seismic Risk Maps for Bridges

提出的研究计划的主要目标是开发一种新的方法来评估桥梁的地震易损性。该方法基于变形危险曲线的使用，它代表了不同变形水平（从弹性变形到坍塌）的平均年概率。与目前使用的易损性曲线相比，变形危险曲线具有明显的优势。也就是说，变形危险曲线涵盖了桥梁在其使用寿命期间可能经历的所有响应，并包括桥梁位置地震危险的影响。通过选取单一的全局变形参数对响应进行量化，并通过不同烈度指标的年超过概率来表示桥梁位置的地震危险性。变形参数和强度测量是该方法中的关键参数，并对这些参数的选择进行了专门的研究。

The main goal of the proposed research program is to develop a new methodology for the seismic vulnerability assessment of bridges. The methodology is based on the use of deformation hazard curves, which represent the mean annual probabilities of exceedance of different deformation levels (from elastic deformations to collapse). The deformation hazard curves have significant advantages compared with the fragility curves that are currently used. Namely, the deformation hazard curves cover all the responses that the bridge might experience during its lifespan, and include the effects of the seismic hazard at the bridge location. The responses are quantified by a selected single global deformation parameter, and the seismic hazard at the bridge location is represented by the annual probability of exceedance of different levels of an intensity measure. The deformation parameter and the intensity measure are key parameters in the methodology, and special investigations are proposed for the selection of these parameters.