基于美标的桥梁抗震加固评估方法研究

摘要:

详细论述了美国标准关于桥梁抗震加固设计的评估分析方法。提出了指数法和损伤评估法两种定量的初步评估法，其中指数法能定量评估旧桥进行抗震加固的迫切性大小，便于相关部门制定区域旧桥抗震加固维修优先级目录，损伤评估法通过易损曲线的建立，侧重评估桥梁进行抗震加固的直接成本，并结合非直接成本评估旧桥抗震加固的合理性。通过中美标设计反应谱的换算，两种方法均可作为国内强震区域旧桥是否需进行抗震加固或桥梁抗震加固优先级的参考，其中损伤评估法也可以作为国内桥梁抗震加固直接成本估算的参考。最后结合工程实例运用指数法和伤评估法进行了具体分析运用，对于国内大量旧桥进行快速抗震评估具有积极的意义。

Abstract:

The evaluation and analysis method of bridge seismic strengthening design of American standard is discussed in detail. Two quantitative preliminary evaluation methods, the index method and the damage assessment method, are proposed. The index method can quantitatively evaluate the urgency of the existing bridges, which is convenient for relevant departments to formulate a priority list of maintenance of existing bridges in the region. The damage assessment method has established the vulnerability curve to evaluate the direct cost of seismic reinforcement of bridges, and evaluate the rationality of seismic reinforcement of existing bridges in combination with indirect costs. Through the conversion of the design response spectrum of the Chinese and American seismic specification, both methods can be used as a reference for necessity and rationality for the bridge seismic reinforcement. Finally, combined with the examples, the index method and the damage assessment method are used for specific analysis and application, which has positive significance for the rapid seismic assessment of a large number of old bridges in China.