Abstract

For a bridge, its columns or piers, which are the main seismically resistant members of the bridge, are generally retrofitted to improve seismic performance. However, retrofitting may cause unexpected damage to the non-retrofitted components/members. Therefore, a corresponding retrofitting of these components/members should be considered as part of any retrofitting method to eliminate unexpected damage. This work is to develop an estimating procedure of the seismic reliability of the system for a bridge considering the seismic reliability of each specified component/member. Additionally, the damage state of bridge for the system reliability analysis is built based on the engineering judgement. For the convenience of the calculation, the seven-point estimation method and the Nataf transformation method are combined to calculate the first four moment values of a specified limit state function in the moment-based system reliability analysis. For determining the retrofitting strategy, this work also presents a method for calculating the relationship between the resilience in functionality and seismic intensity that is achieved using a particular retrofitting method. Moreover, the system reliability and recovery time of each damaged component/member are considered in a resilience analysis. Finally, a bridge is selected as an example to demonstrate the application of this work.

摘要

对于桥梁，通常对桥梁的主要抗震构件进行加固，以提高其抗震性能。但是，翻新可能会对未翻新的组件/构件造成意外损坏。因此，应将这些组件/构件的相应改装视为任何改装方法的一部分，以消除意外损坏。这项工作是要开发一种考虑到每个指定部件/构件的地震可靠度的桥梁系统的地震可靠度的估计程序。另外，基于工程判断，建立了桥梁的损伤状态，用于系统的可靠性分析。为了计算方便，在基于矩的系统可靠性分析中，结合了七点估计方法和Nataf变换方法来计算指定极限状态函数的前四个矩值。为了确定改造策略，这项工作还提出了一种使用特定的改造方法来计算功能弹性与地震烈度之间关系的方法。此外，在弹性分析中考虑了每个受损组件/构件的系统可靠性和恢复时间。最后，以桥梁为例来说明这项工作的应用。这项工作还提出了一种计算功能弹性与地震强度之间关系的方法，该方法是使用特定的改造方法实现的。此外，在弹性分析中考虑了每个受损组件/构件的系统可靠性和恢复时间。最后，以桥梁为例来说明这项工作的应用。这项工作还提出了一种计算功能弹性与地震强度之间关系的方法，该方法是使用特定的改造方法实现的。此外，在弹性分析中考虑了每个受损组件/构件的系统可靠性和恢复时间。最后，以桥梁为例来说明这项工作的应用。