采用中层减隔震体系不规则梁桥顺桥向抗震性能研究

Seismic Analysis of Irregular Bridge Based on Pier-Middle Seismic Isolation Design Along Span Direction

从高墩桥梁的抗震难点出发,研究支座设置位置对其减震性能的影响。提出将传统的桥梁支座由墩顶转向墩的中部,墩顶与梁体固结,变高墩为低墩结构设计方案,使得高墩桥梁的抗震设计由延性设计转向减隔震设计。以某城市高架桥为研究对象,分别对刚构设计、墩顶减隔震设计、墩中减隔震设计以及墩底减隔震设计的抗震性能进行研究与评估。研究表明,中层减隔震体系桥梁可以改善并优化高烈度区高墩桥梁的地震响应。

Beginning with the seismic difficulties of bridges with high piers , the paper studies the influence of the pier position on the seismic performance .It presents the structure design plan in which the traditional bridge pier changes the position from the top to the middle , the top is tightly fixed with the beam , and the high pier turns to the low one so that the high-pier bridge seismic design changes from the ductility design to the seismic design.The fly-over highway of a city is used as an example to study and evaluate the seismic performance of the steel structure design , the pier-top seismic design , pier-middle seismic design and pier-bottom seismic design.The research shows that the pier-middle seismic design can improve and optimize the earthquake responses of high-pier bridges in the high-intensity area .