摘要
本研究采用有限元软件Midas/Civil建立三跨连续小箱梁模型,分别采用时程分析法和反应谱法,对应用减隔震支座的减隔震桥梁和不应用减隔震支座的常规桥梁进行有限元分析,研究其动力特性。结果表明:在恒载和地震荷载共同作用下,减隔震桥梁相较于非减隔震桥梁,其自振周期提高20%左右,桥墩内力峰值也较小,且减隔震桥梁是通过减隔震支座来抵消地震效应,桥墩还处弹性阶段,位移变形较小,不需要设置横向挡块,而非减隔震桥梁是通过桥墩自身抵抗地震作用,桥墩已进入塑性,变形较大需要设置横向挡块。
In this paper,the finite element software MIDAS/civil is used to establish a three span continuous small box girder model,and the time history analysis method and response spectrum method are used respectively to analyze the Seismic Isolation Bridge with seismic isolation bearing and the conventional bridge without seismic isolation bearing,and to study its dynamic characteristics.The results show that:under the combined action of dead load and seismic load,the natural vibration period of the seismic isolation bridge is increased by about 20%compared with the non seismic isolation bridge,and the internal force of the pier is also small,and the seismic effect of the seismic isolation bridge is offset by the seismic isolation bearing,the pier is still in the elastic stage,the displacement deformation is small,there is no need to set the lateral block,and the non seismic isolation bridge is offset by the pier itself Under the earthquake resistance,the pier has entered the plastic stage,and the deformation is large,so it is necessary to set the lateral stop.
作者
闫凯
Yan Kai(Zhengzhou Branch of China Railway Fifth Survey and Design Institute Group Co.,Ltd.,Zhengzhou 450001,China)
出处
《科学技术创新》
2022年第32期145-148,共4页
Scientific and Technological Innovation
关键词
时程分析法
反应谱法
减隔震支座
有限元
time history analysis method
response spectrum method
seismic isolation bearing
finite element method
