组合减隔震装置在非对称独塔斜拉桥抗震设计中的应用

Application of Combined Seismic Isolation Device in Seismic Design of Ansymmetrical Single-tower Cable-stayed Bridge

建立太城溪特大桥有限元模型,采用非线性时程分析法研究组合减隔震装置对非对称独塔斜拉桥过渡墩横桥向的隔震效果。结果表明:与常规球型钢支座相比,铅芯橡胶支座使过渡墩墩底横向弯矩减少39%~52%,墩顶横向位移增加41%~79%;组合减隔震装置使过渡墩墩底横向弯矩减小36%~58%,墩顶横向位移减小33%~48%;组合减隔震装置降低了地震响应且避免结构发生过大位移,可以用于解决非对称独塔斜拉桥的横桥向抗震问题。

The finite element model of Taichengxi super large bridge was established,and the seismic isolation effect of the combined seismic isolation device on the transverse direction of the transition pier of the asymmetric single-tower cable-stayed bridge was studied by using the nonlinear time history analysis method.The results show that compared with the conventional spherical steel bearing,the lead rubber bearing can reduce the transverse bending moment at the bottom of the transition pier by 39%~52%,and increase the transverse displacement at the top of the pier by 41%~79%.The combined seismic isolation device reduces the transverse bending moment at the bottom of the transition pier by 36%~58%,and the transverse displacement at the top of the pier by 33%~48%.The combined seismic isolation device can reduce the seismic response and avoid excessive displacement of the structure,which can be used to solve the transverse seismic problem of asymmetric single-tower cable-stayed bridge.