GOR.1号大桥预应力混凝土连续刚构抗震设计优化

Anti-seismic optimization design for the prestressed concrete continuous rigid frame of GOR.1 bridge

采用反应谱法,借助MIDAS和UCFBER有限元软件,对GOR.1号大桥连续刚构桥梁的抗震性能进行验证。结果显示,E1和E2作用下,预应力混凝土连续刚构桥梁的主墩可通过抗震控制验算,在E2地震作用下,主桥桥墩部分桩基出现拉拔力,不能满足规范规定的抗震目标需求。进一步采用改变桥墩形式、改变桩基布置方式、采用新材料和变更桩基配筋率四种方式对原方案进行优化设计,并对四种方案的优化效果进行了对比分析。

In this paper,based on the response spectrum method,the seismic performance of continuous rigid frame bridges of the GOR.1 bridge is verified by using finite element software MIDAS and UCFBER.Results indicate that the main pier of prestressed concrete continuous rigid frame bridges satisfies the seismic performance requirement under the effects of E1 and E2.However,a drawing force appears on the pile foundation of main pier under the effect of E2,which makes the bridges cannot meet the demands of seismic code.Thus,four schemes are performed to optimize the original plan,including changing pier form,changing the arrangement of pier,adopting new materials and changing the reinforcement ratios of pile foundation.Furthermore,the optimization effects of four schemes on are compared and analyzed.