滨海特大高架桥梁抗震优化设计

为研究滨海特大高架桥梁地震反应性能,分析下部结构的影响,优化桥梁设计,为工程抗震设计提供参考.以工程实例为对象,建立三维动力模型,分析不同墩柱尺寸和桩基方案对桥梁地震反应的影响,并对桥梁进行延性抗震设计验算.结果 表明:随着墩柱尺寸和桩基数量增加,虽然其自身承载能力会变大,但同步地震反应也会增大;因此,需要选取经济合理的截面尺寸和桩基数量;根据分析选取的两项设计参数,在地震作用下,可以很好的满足延性抗震设计要求.

Seismic Optimization Design of Coastal Extra-large Elevated Bridge

In order to study the seismic response performance of coastal extra-large elevated bridge, the influence of substructure is analyzed and the bridge design is optimized, which provide reference for the seismic design of project. Taking an engineering project as an example, a three-dimensional dynamic model is established to analyze the influences of different pier sizes and pile foundation schemes on the seismic response of the bridge, and the ductility seismic design of the bridge is checked. The results show that with the increase of pier size and pile foundation number, its own bearing capacity will increase, but the synchronous seismic response will also increase. Therefore, it is necessary to select the economic and reasonable section size and pile foundation number. According to the analysis, two selected design parameters can well meet the requirements of ductility seismic design under the earthquake action.