摘要
采用常规设计的系杆拱桥固定墩地震响应较大,固定墩的能力往往无法满足抗震性能目标。基于一座主跨跨径为105 m的钢箱拱肋系杆拱桥的工程背景,设计拉索减震支座同时变化拉索初始自由行程的三个减隔震方案,采用非线性时程方法分析地震作用下各个方案的墩、桩地震响应。分析可得:在拱桥中应用拉索减震支座,可以达到较好的减隔震效果;通过合理地控制拉索的初始自由行程,既可有效地减小桥梁易损构件墩和桩的地震响应,同时又可有效限制墩梁相对位移.
Seismic responses of the fixed pier in an arch bridge under the conventional seismic design cannot meet the seismic fortification criterion.Based on a 105m long span tied-arch bridge with steel-box ribs,three aseismic design schemes were designed by using the cable-sliding aseismic bearing.The seismic response of bridge was analyzed by using the nonlinear time history analysis method.The results indicate that with the cable-sliding friction aseismic bearing,the seismic responses of piers and piles can be effectively reduced ; moreover,displacement between the pier and the beam can also be controlled by adjusting the initial free movement of cables.
出处
《结构工程师》
北大核心
2013年第5期84-90,共7页
Structural Engineers
基金
国家自然科学基金资助项目(51278376
90915011)
同济大学土木工程学院光华基金资助项目
关键词
系杆拱桥
拉索减震支座
墩梁相对位移
tied-arch bridge
cable-sliding friction aseismic bearing
displacement between pier and beam
