支承体系对多塔矮塔斜拉桥横向地震响应的影响

Influence of Support System on Transverse Seismic Response of Multi-tower Extra-dosed Cable-stayed Bridge

国内外对纵向地震输入下矮塔斜拉桥的支承体系进行过许多研究,结果表明,不同支承体系对矮塔斜拉桥的纵向地震响应有较大的影响,但在支承体系对多塔矮塔斜拉桥横向地震响应影响方面的研究很少。以一座典型多塔矮塔斜拉桥为背景,针对多塔矮塔斜拉桥结构特点,分别比较了塔梁固接、塔墩分离,塔墩固接、塔梁分离,塔、墩、梁固接三种不同支承体系横桥向地震反应特点,研究了采用摩擦摆支座减小多塔矮塔斜拉桥横向地震反应的效果。

Many studies have been carried out on the support system of the extra-dosed cable-stayed bridge under longitudinal seismic input at home and abroad.The results show that different support systems have a great influence on the longitudinal seismic response of the extra-dosed cable-stayed bridge.However,there is little research on the influence of support system on transverse seismic response of multi-tower extra-dosed cable-stayed bridge.Based on the structure characteristics of a typical multi-tower extra-dosed cable-stayed bridge,this article compares differences of transverse seismic response of three different supporting systems.and the effect of using the double spherical bearing to reduce transverse seismic response of multi-tower dwarf tower cable-stayed bridge is studied.