钢筋混凝土圆形空心高墩地震易损性分析

Evaluation of Seismic Vulnerability of Reinforced Concrete Circular Hollow High-piers

研究目的:截面形式对桥墩的力学性能有很大影响,中空截面的混凝土铁路桥梁的高墩有明显的优越性,然而目前对圆形中空高墩的抗震性能研究有侍进一步深入。本文以圆形空心高墩控制截面的材料发生损伤时所对应的截面曲率为损伤指标,采用增量动力分析方法,研究了圆形空心高墩的抗震性能。研究结论:分析结果表明:(1)圆形空心高墩在地震作用下,墩底、墩身中部、墩顶都是容易发生损伤的部位,但墩底比墩身中部和墩顶发生损伤的概率更大;(2)圆形空心高墩各个截面发生完全损伤的概率较小,说明圆形空心高墩的抗震性能优异;(3)圆形空心高墩地震易损性分析可为实际工程中高墩铁路桥梁的抗震性能研究提供理论依据。

Research purposes： Cross - section form has a great impact on the mechanical properties of the pier of railway bridges, and hollow concrete high- piers show obvious superiority. However, the research of the seismic behavior for reinforced concrete （RC） circular hollow high - pier needs to be further carried out. The curvatures of the control section of the circular hollow high - pier corresponding to the material damage are chosen as a damage status. This paper presents seismic response of RC circular hollow high - pier under 15 earthquake ground motion records using incremental dynamic analysis, proposes the probability of expected damage modes forms the vulnerability curves, studies the seismic performance of circular concrete high - piers. circular hollow high - pier appears not only at the bottom of the pier but also in the middle of the pier and on the top of the pier under the earthquake, but the vulnerability at the bottom of the pier is higher than that of other areas ; （2） The probability of the complete injury is small, and it indicates that the seismic performance of the RC circular hollow high - pier is good; （3） The seismic vulnerability analysis of circular hollow high pier provide theoretical basis for seismic performance research of the practical engineering.