独塔混合梁斜拉桥阻尼器参数敏感性分析
|
摘要
为研究阻尼器参数对独塔混合梁斜拉桥关键节点位移和关键截面内力的影响规律,获得最优阻尼参数组合及其减震效果,以某主跨260m的铁路独塔混合梁斜拉桥为工程背景,对阻尼器力学参数进行研究。采用MIDAS Civil软件建立全桥结构地震响应模型,在塔梁交接处设置2个粘滞阻尼器,考虑桩-土相互作用,选择合适的地震时程函数,进行了阻尼器参数敏感性分析。结果显示:阻尼指数α和阻尼系数C对独塔混合梁斜拉桥关键节点位移、关键截面内力的影响呈相反趋势;该桥最佳阻尼器参数组合为α=0.3和C=4 000kN/(m/s)α;设置粘滞阻尼器后,桥塔塔顶位移、钢-混结合部位移和主梁梁端位移分别减小了69.8%、72%和72.9%,桥塔塔底截面弯矩减小了16.34%。
To study the influence rules of the damper parameters on the key node displacement and key section internal forces of single-pylon hybrid beam cable-stayed bridges and to obtain the optimal damping parameter combination and its seismic reduction effect,an actual railway singlepylon hybrid beam cable-stayed bridge with a main span of 260 m was cited as an example and the sensitivity analysis on the mechanical parameters of the dampers was carried out.The seismic responses of the whole bridge structure were modelled by the MIDAS Civil,two viscous dampers were installed in the intersection of the pylon and main girder and the pile-soil interaction was also considered.The appropriate seismic time functions were selected and the sensitivity analysis of the damping parameters was carried out.The results show that the influences of the damping indices and damping coefficients on the key node displacement and key section internal forces of the singlepylon hybrid-beam cable-stayed bridge are opposite.The optimal damper parameters areα=0.3 and C=4 000 kN/(m/s)α,the longitudinal displacement at the top of the pylon,the composite joint of the steel-concrete,the end of the main girder and the bending moment at the bottom of the pylon decrease by 69.8%,72%,72.9%,16.34%respectively with the viscous dampers being installed.
To study the influence rules of the damper parameters on the key node displacement and key section internal forces of single-pylon hybrid beam cable-stayed bridges and to obtain the optimal damping parameter combination and its seismic reduction effect,an actual railway singlepylon hybrid beam cable-stayed bridge with a main span of 260 m was cited as an example and the sensitivity analysis on the mechanical parameters of the dampers was carried out.The seismic responses of the whole bridge structure were modelled by the MIDAS Civil,two viscous dampers were installed in the intersection of the pylon and main girder and the pile-soil interaction was also considered.The appropriate seismic time functions were selected and the sensitivity analysis of the damping parameters was carried out.The results show that the influences of the damping indices and damping coefficients on the key node displacement and key section internal forces of the singlepylon hybrid-beam cable-stayed bridge are opposite.The optimal damper parameters areα=0.3 and C=4 000 kN/(m/s)α,the longitudinal displacement at the top of the pylon,the composite joint of the steel-concrete,the end of the main girder and the bending moment at the bottom of the pylon decrease by 69.8%,72%,72.9%,16.34%respectively with the viscous dampers being installed.
引文
[1]徐艳,曾诗杰.斜拉桥横桥向设置钢阻尼器的减震优化研究[J].桥梁建设,2017,47(3):53-58.(XU Yan,ZENG Shi-Jie.Study of Optimal Seismic Mitigation of Steel Dampers Arranged on Cable-Stayed Bridge in Transverse Bridge Direction[J].Bridge Construction,2017,47(3):53-58.in Chinese)
[2]娄锋.大跨度斜拉桥阻尼器参数分析[J].世界地震工程,2015,31(1):129-133.(LOU Feng.Viscous Damper Parameter Analysis on a Long-Span Cable-Stayed Bridge[J].World Earthquake Engineering,2015,31(1):129-133.in Chinese)
[3]严斌.大跨度斜拉桥非线性粘滞阻尼器参数研究[J].铁道标准设计,2013(1):74-78.(YAN Bin.Parametric Study on Nonlinear Viscous Damper of Long-Span Cable-Stayed Bridge[J].Railway Standard Design,2013(1):74-78.in Chinese)
[4]李小珍,谭清泉,肖林,等.大跨度三塔斜拉桥减震措施研究[J].铁道工程学报,2016,33(9):70-75.(LI Xiao-zhen,TAN Qing-quan,XIAO Lin,et al.Research on the Anti-Seismic Measures for Long-Span Three-Pylon Cable-Stayed Bridges[J].Journal of Railway Engineering Society,2016,33(9):70-75.in Chinese)
[5]郭辉,李永强,胡所亭.主跨532m公铁两用斜拉桥的地震响应及阻尼器减震效果研究[J].铁道建筑,2015(1):14-18.(GUO Hui,LI Yong-qiang,HU Suo-ting.Research on Earthquake Response of Highway and Railway Shared Cable-Stayed Bridge with 532m-Main Span and Vibration-Reducing Effect of Damper[J].Railway Engineering,2015(1):14-18.in Chinese)
[6]张永亮,宁贵霞,陈兴冲,等.考虑桩-土相互作用效应的高速铁路桥梁桩基础抗震设计方法研究[J].冰川冻土,2016,38(4):1 003-1 011.(Zhang Yong-liang,Ning Gui-xia,Chen Xing-chong,et al.Study on Seismic Design Method for High-Speed Railway Bridge Pile Foundations Considering Soil-Pile Interaction Effect[J].Journal of Glaciology and Geocryology,2016,38(4):1 003-1 011.in Chinese)
[7]Li H,Liu J,Ou J.Seismic Response Control of a Cable-Stayed Bridge Using Negative Stiffness Dampers[J].Structural Control&Health Monitoring,2011,18(3):265-288.
[8]TB 10093-2017,铁路桥涵地基和基础设计规范[S].(TB 10093-2017,Code for Design on Subsoil and Foundation of Railway Bridge and Culvert[S].)
[9]毛玉东,李建中.大跨度连续梁桥纵向减震机理和减震效果分析[J].同济大学学报(自然科学版),2016,44(2):185-191.(MAO Yu-dong,LI Jian-zhong.Analysis of Seismic Mitigation Mechanism and Effect on Longitudinal Direction of Long-Span Continuous Bridges[J].Journal of Tongji University(Natural Science),2016,44(2):185-191.in Chinese)
[10]石岩,王东升,孙治国.近断层地震动下减隔震桥梁地震反应分析[J].桥梁建设,2014,44(3):19-24.(SHI Yan,WANG Dong-sheng,SUN Zhi-guo.Analysis of Seismic Response of Seismically Mitigation and Isolated Bridge Subjected to Near-Fault Ground Motion[J].Bridge Construction,2014,44(3):19-24.in Chinese)
[2]娄锋.大跨度斜拉桥阻尼器参数分析[J].世界地震工程,2015,31(1):129-133.(LOU Feng.Viscous Damper Parameter Analysis on a Long-Span Cable-Stayed Bridge[J].World Earthquake Engineering,2015,31(1):129-133.in Chinese)
[3]严斌.大跨度斜拉桥非线性粘滞阻尼器参数研究[J].铁道标准设计,2013(1):74-78.(YAN Bin.Parametric Study on Nonlinear Viscous Damper of Long-Span Cable-Stayed Bridge[J].Railway Standard Design,2013(1):74-78.in Chinese)
[4]李小珍,谭清泉,肖林,等.大跨度三塔斜拉桥减震措施研究[J].铁道工程学报,2016,33(9):70-75.(LI Xiao-zhen,TAN Qing-quan,XIAO Lin,et al.Research on the Anti-Seismic Measures for Long-Span Three-Pylon Cable-Stayed Bridges[J].Journal of Railway Engineering Society,2016,33(9):70-75.in Chinese)
[5]郭辉,李永强,胡所亭.主跨532m公铁两用斜拉桥的地震响应及阻尼器减震效果研究[J].铁道建筑,2015(1):14-18.(GUO Hui,LI Yong-qiang,HU Suo-ting.Research on Earthquake Response of Highway and Railway Shared Cable-Stayed Bridge with 532m-Main Span and Vibration-Reducing Effect of Damper[J].Railway Engineering,2015(1):14-18.in Chinese)
[6]张永亮,宁贵霞,陈兴冲,等.考虑桩-土相互作用效应的高速铁路桥梁桩基础抗震设计方法研究[J].冰川冻土,2016,38(4):1 003-1 011.(Zhang Yong-liang,Ning Gui-xia,Chen Xing-chong,et al.Study on Seismic Design Method for High-Speed Railway Bridge Pile Foundations Considering Soil-Pile Interaction Effect[J].Journal of Glaciology and Geocryology,2016,38(4):1 003-1 011.in Chinese)
[7]Li H,Liu J,Ou J.Seismic Response Control of a Cable-Stayed Bridge Using Negative Stiffness Dampers[J].Structural Control&Health Monitoring,2011,18(3):265-288.
[8]TB 10093-2017,铁路桥涵地基和基础设计规范[S].(TB 10093-2017,Code for Design on Subsoil and Foundation of Railway Bridge and Culvert[S].)
[9]毛玉东,李建中.大跨度连续梁桥纵向减震机理和减震效果分析[J].同济大学学报(自然科学版),2016,44(2):185-191.(MAO Yu-dong,LI Jian-zhong.Analysis of Seismic Mitigation Mechanism and Effect on Longitudinal Direction of Long-Span Continuous Bridges[J].Journal of Tongji University(Natural Science),2016,44(2):185-191.in Chinese)
[10]石岩,王东升,孙治国.近断层地震动下减隔震桥梁地震反应分析[J].桥梁建设,2014,44(3):19-24.(SHI Yan,WANG Dong-sheng,SUN Zhi-guo.Analysis of Seismic Response of Seismically Mitigation and Isolated Bridge Subjected to Near-Fault Ground Motion[J].Bridge Construction,2014,44(3):19-24.in Chinese)