日本铁路桥梁抗震设计中延性率的评价方法

在结构延性抗震设计中,构件以及结构的延性能力计算结果是影响结构抗震性能评价的重要参数。铁路高架桥梁多采用单层或多层刚架,多次超静定结构的破坏形式十分复杂,合理评价它的变形能力是桥梁抗震设计所面临的重要课题。根据作者过去在这一方面的设计经历,介绍了日本现行铁路高架桥设计采用的构件延性率计算方法,以供桥梁抗震设计参考。

Evaluation Method of Ductility Ratio in Seismic Design of Railway Bridges in Japan

In seismic design of structural ductility,the calculation results of ductility of structural elements and structures themselves are the important parameters that will have influences on the evaluation of seismic performance of the structures.For railway viaducts,the single-or multiple-level rigid frames are often used,the possible failure forms of the structures of multiple statically indeterminate types are extremely complicated.Therefore,the reasonable evaluation of deformation of the structures becomes a significant issue that the bridge seismic design should confront.In this paper,in connection with the author's design experiences in this regard,the current calculation methods for structural ductility ratio of railway viaducts in Japan are described with an aim to providing reference to the seismic design of similar bridges.