新疆伊犁河大桥主桥地震响应分析

研究目的:新疆伊犁河大桥是连接218国道和313省道的重点控制工程,主桥为(66+5×120+66)m双肢薄壁连续刚构桥,该桥被称为新疆第一大桥。桥址位于7度地震区内,目前对这类大跨度连续刚构桥的地震反应研究很少。为保证该桥的抗震安全,研究该桥的地震响应规律,为同类桥梁设计提供参考依据。研究结论:通过分析得出:(1)对于连续刚构桥而言,塑性铰的位置出现在刚构墩的墩顶及墩底,抗震设计时需要加强此处的设计;(2)该大桥在地震反应下,虽然出现塑性铰,但与破坏位移还有一定的距离;(3)该桥具有一定的延性能力,满足大震不倒的要求。

Analysis of Seismic Response of Main Bridge of Yili River Bridge

Research purposes:The Yili River Bridge is an important project to connect the 218 National Highway with 313 Provincial Highway and is the largest bridge in Xingjiang with main bridge of coupled thin wall continuous rigid frame bridge(66+5×120+66) m.It is located in 7 degree earthquake region.As there is a little research on the seismic response of long span continuous rigid frame bridge is very rare,it is necessary to research the seismic response regulations of this bridge to make sure the bridge safety and provide the reference to the similar works. Research conclusions:From the analysis it is concluded(1) For the continuous rigid frame bridge,the plastic hinges region is on the top or bottom of frame pier and where need to be strengthened.(2) Under the seismic reaction,the plastic hinges happen to this bridge,but they keep certain away from the damaged displacement.(3) The Yili River Bridge has enough ductility and it can not fall under the serious earthquake.