基于拉索减震支座的高墩桥梁抗震设计策略

近年来，随着我国桥梁工程的高速发展，桥梁交通网络不断完善，更多的高墩桥梁被应用于实际工程中。以某实际工程中的高墩桥梁为例，提出了基于拉索减震支座的抗震设计策略，对比研究了常规体系、采用摩擦摆支座的减隔震设计方案，分析了不同方案在E2水平地震作用下的桥梁结构响应。分析结果表明：高墩桥梁中采用拉索减震支座、摩擦摆支座都能有效地降低结构地震内力响应。摩擦摆支座与常规体系都可能导致较大的墩梁相对位移；拉索减震支座可有效控制墩梁相对位移，有利于防止落梁灾害的发生，是一种合理有效的抗震设防策略。研究内容可为高墩桥梁抗震设计提供有益参考。

Strategy on Aseismic Design of High-pier Bridge Based on Cable Aseismic Bearing

In recent years, with the rapid development of bridge engineering and continuous improvement of bridge traffic network in China, more high-pier bridges have been applied to the practical projects. Taking the high-pier bridge in a practical project as an example, the aseismic design strategy based on cable aseismic bearing is proposed. The seismic isolation design schemes of conventional system and friction pendulum bearings are compared and studied. The bridge structural responses of different schemes under E2 horizontal earthquake are analyzed. The analysis results show that both cable aseismic bearing and friction pendulum bearing adopted in the high-pier bridge can effectively reduce the seismic internal force response of the structure. The friction pendulum bearing and the conventional system may all lead to the larger relative displacement of piers and beams. The cable aseismic bearings can effectively control the relative displacement of pier and beams and prevent the beam falling disasters, which is a reasonable and effective seismic fortification strategy. The study contents can provide the useful reference for aseismic design of high-pier bridges.