兰州市小西湖部分斜拉桥抗震分析

Seismic Analysis of Xiaoxihu Partial Cable-stayed Bridge in Lanzhou

兰州市小西湖黄河大桥主桥采用部分斜拉桥方案,桥跨布置为81.2m+136m+81.2m,单索面,塔高17m,主梁采用梯形截面单箱三室箱梁,塔梁固结,墩梁分离,是我国仅有的几座部分斜拉桥之一.由于兰州市地处8度地震区,需要对该桥进行抗震设计.依据三水准抗震设计目标,对该桥进行了弹塑性抗震验算.

The project of Xiaoxihu Yellow River Bridge in Lanzhou was chosen as partial cablestayed bridge, whose span is 81.2 m+136 m+81.2 m with single rank ropes. The height of the tower is 17 m and the main beam was adopted as threecell single box whose beam was fixed to the tower and the piers were separated from the beam. Only a few partial cablestayed bridges have been built in China besides it. As the bridge located in the seismic area of 8 degree, seismic design should be made. In this paper an elastoplastic seismic checking was performed according to the goal of threelevel seismic design.