【摘要】 论文运用通用有限元软件ANSYS对香溪长江大桥-大跨度拱桥进行了数值模拟。以COMBIN37单元模拟非线性粘滞阻尼器,分析了该阻尼器布置于拱肋横梁与主梁处(方案1)及安装在立柱与主梁之间(方案2)两种不同位置时对拱桥的地震响应控制效果。分析结果表明:针对顺桥向位移反应,方案1的控制效果明显优于方案2;两种阻尼器控制方案均对桥面加速度有放大作用,且方案1的放大效果要比方案2大。两种阻尼器控制方案对拱顶及拱脚轴力均有较好的控制效果,且方案1的控制效果优于方案2;两种阻尼器控制方案对拱桥面内弯矩的控制效果,方案2的控制效果优于方案1。上述研究结果为大跨度拱桥振动控制分析及工程应用具有重要的指导意义。更多还原

【Abstract】 In the present paper,numerical analysis of Xiangxi Yangtze River Arch Bridge with long-span is carried out by using the commercial finite element software ANSYS. Nonlinear viscous damper modeled with COMBIN37 element was simulated. The control efficacy of the arch bridge installed with nonlinear viscous dampers was analyzed when the viscous dampers were arranged on the site of the rib beam and the main beam( Scheme 1),and between the column and the main beam( Scheme 2),respectively. The numerical analysis results show that the control efficacy of scheme 1 is obviously better than that of scheme 2 on the mitigation of the displacement response of the bridge deck. However,both of two schemes could enlarge the acceleration response of the bridge deck. Moreover,the negative effect of scheme 1 is greater than that of scheme 2. In addition,both of two schemes could decrease the force of the vault and spring of main arch,and the scheme 2 have the better control efficacy on the force of the vault and spring of main arch. For the in-plane bending moment,the control efficacy of scheme 2 is superior to that of scheme 1. These investigations provide important guidance for the vibration control analysis and engineering application of long-span arch bridges.更多还原