不等跨预应力连续箱梁人行天桥抗震性能分析

Seismic Performance Analysis of Unequal Span Prestressed Continuous Box Girder Pedestrian Overpass

人行天桥是城市交通中的重要组成部分,其能较大程度的缓解城市道路拥挤的问题,由于其构造相对较为简单,大多数对于人行天桥的研究都集中于车桥和人桥共振或者行人舒适度的影响,对于人行天桥的抗震研究较少。本文以某实际工程的不规则跨度的现浇预应力混凝土连续箱梁人行天桥为例,对其进行整体建模,在考虑桥梁所在位置处的地震烈度等级以及桩土间的共同作用情况下,分析其在地震作用下产生的内力,并对其构件强度进行验算,得出相关结论,以期对类似工程提供参考。

Pedestrian bridges are an important part of urban traffic,which can alleviate the problem of urban road congestion to a large extent.Due to their relatively simple structure,most of the research on pedestrian bridges focuses on the resonance of vehicle and pedestrian bridges or The impact of pedestrian comfort is seldom studied on the earthquake resistance of pedestrian bridges.In this paper,an irregular-span cast-in-place prestressed concrete continuous box girder pedestrian overpass is taken as an example,and the overall modeling is carried out.The internal force generated under the action of earthquake is analyzed,and the strength of its components is checked,and relevant conclusions are drawn,in order to provide reference for similar projects.