两种减隔震支座性能对比研究

通过对摩擦摆支座及弹塑性钢阻尼支座两种不同类型的减隔震支座的抗震性能进行对比,选择适合项目要求的支座类型。对比结果表明:两种减隔震支座均能够有效延长桥梁结构自振周期,支座横向刚度较小的摩擦摆支座更有利于周期的延长,同时产生的墩顶剪力也较小;对于墩底截面及基顶截面的弯矩和剪力,在墩高较低时横向刚度小的摩擦摆支座减隔震性能较好,而墩高大于20 m时,横向刚度大的弹塑性钢阻尼支座更有优势。

Comparative Research on Seismic Performance of two types of Isolators

Through comparative research on the seismic performance of the two different types of bearing - friction pendulum bearing and ELASTOPLASTIC steel damping bearing,select the right type of bearing for the project.Comparative results show that: Both the two isolation bearing are able to effectively extend the bridge structure vibration period, the smaller lateral rigidity in friction pendulum bearing is more conducive to extend the period, while producing less top-of-the-pier shear force; For the cross-sectional bending sqaure and shear forces of pier bottom and the top, in low pier, smaller lateral rigidity in friction pendulum bearing shows better performance, while when the pier reaches above 20 meters tall , the greater in lateral stiffness of elastoplastic damping steel bearing has the advantage.