大跨度提篮拱桥阻尼器选型研究

Study on Damper Selection of Long-span X-style Arch Bridge

基于流体粘滞阻尼器的力学特性,以南沙凤凰三桥为工程背景,研究了非线性粘滞阻尼器对大跨度提篮拱桥抗震性能的影响。采用非线性时程分析方法,对非线性粘滞阻尼器的阻尼系数和阻尼指数进行了参数敏感性分析,讨论了阻尼器合理参数取值。分析表明:通过中跨两端位置设置纵向粘滞阻尼器,可以有效地降低结构在地震作用下关键部位的位移,改善结构构件的地震力;减震效果取决于阻尼器参数;同时,设置阻尼器避免了相邻主梁可能发生碰撞引起的结构损坏。

Based on the mechanics characteristics of fluid viscous damper, the article studies the influence of nonlinear viscous damper on the seismic performance of long-span X-style arch bridge by Nansha Fenghuang Bridge 3. The article analyzes the parameter sensibility of damping coefficient and damping index of nonlinear viscous damper, and discusses the reasonable parameter valuing of damper. The analysis shows that the longitudinal viscous damper to be installed at two ends of middle span can efficiently reduce the displacement of key positions of structure in the earthquake, improve the seismic force of structural members,and prevent the main adjacent beams from structural damage possibly caused by collision. The seismic effect depends on the damper parameters.