摘要
随着近年来高速铁路的大规模建设,高烈度区简支梁桥成为常用结构,研究其抗震设计具有重要的现实意义。结合中卫至兰州高速铁路位于抗震设防烈度Ⅷ区(动峰值加速度0.3g)、场地特征周期0.45 s跨定武高速公路特大桥的工程实例,分常规设计和减隔震设计两种情况,对比简化计算、反应谱、时程三种方法的计算结果,对比分别采用分离式减震榫、榫形防落梁、双曲面球型减隔震支座及新型钢阻尼减隔震支座四种不同减隔震设计方案下桥梁的地震响应,结果表明:对简支梁桥墩,简化计算方法能满足抗震计算精度要求;新型钢阻尼减隔震支座具有较好的减隔震效果。
With the large-scale construction of high-speed railways in recent years,simply supported beam bridges in high intensity areas have become commonly used structures,and studying their seismic design has important practical significance.Based on the engineering example of a super large bridge crossing the Dingwu Highway on the high-speed railway from Zhongwei to Lanzhou located in the seismic fortification intensityⅧzone(dynamic peak acceleration 0.3g),with a site characteristic period of 0.45 s,divided into conventional design and seismic isolation design,this paper compared the calculation results of simplified calculation,response spectrum,and time history methods and studied the seismic response of bridges using four types of vibration reduction and isolation devices,namely separated seismic isolation tenon,tenon shaped anti falling beam,hyperbolic spherical seismic isolation bearing,and new steel damping seismic isolation bearing.The results indicate that for simply supported beam piers,the simplified calculation method can meet the accuracy requirements of seismic calculation;the new type of steel damping seismic isolation bearing has good seismic isolation effect.
作者
刘俊
LIU Jun(China Railway Fifth Survey and Design Institute Group Co.Ltd.,Beijing 102600,China)
出处
《铁道建筑技术》
2024年第1期46-50,共5页
Railway Construction Technology
基金
中铁第五勘察设计院集团有限公司科研基金项目(T5Y2016-D06)。
关键词
高烈度区
高速铁路
简支梁
常规设计
减隔震设计
high intensity zone
high-speed railway
simply supported beam
conventional design
seismic isolation design
