双曲面球型减隔震支座在刚构连续梁桥中的应用

Application of double spherical seismic isolation bearing in a rigid frame-continuous girder bridge

结合处于高烈度地震地区的某(48+4×80+48)m刚构连续梁桥的工程实例,分析表明对高烈度区的长联多跨刚构连续梁桥进行常规抗震设计往往无法达到抗震设防目标。应用双曲面球型减隔震支座进行减震设计,可以有效地降低抗震设计控制截面的内力,使结构设计更容易满足抗震规范的要求。同时分析了双曲面球型减隔震支座的两个主要参数摩擦系数和球心距对刚构墩减震效果的影响。对于同一个球心距,刚构墩墩底的顺桥向弯矩响应、墩顶的顺桥向位移响应随摩擦因数的增大而减小,横桥向弯矩响应、横桥向位移响应随摩擦因数的增大而增大;对于同一个摩擦因数,随着球心距的增加,刚构墩墩底的顺桥向、横桥向弯矩响应以及墩顶的横桥向位移响应均呈现减小趋势,而刚构墩墩顶的顺桥向位移响应呈现先减小后增大的趋势。

Taking a （48 ＋ 4x80 ＋ 48 ）m rigid frame -continuous girder bridge in a high intensity earthquake area as an example, the long multi - span rigid frame - continuous girder bridge under conventional seimic design can not meet with the seismic fortification criterion. Application of the double spherical seismic isolation effectively reduce the internal force of the controlling bearing can section so as to meet the requirements of code for seismic design. The effect of the two major factors, which are friction coefficient and center distance of the two spherical surface, on the result of the bearing was also analyzed. According to the analysis, at the same center distance of the two spherical surface, the longitudinal bending moment at the bottom of the rigid frame pier and the longitudinal displacement at the top of the rigid frame pier were reduced with the increase of friction coefficient, and the transverse bending moment at the bottom of the rigid frame pier and the transverse displacement at the top of the rigid frame pier were increased with the increase of friction coefficient ; At the same friction coefficient, with the increase of center distance of the two spherical surface, the longitudinal and transverse bending moment at the bottom of the rigid frame pier and the transverse displacement at the top of the rigid frame pier were decreased, and the longitudinal displacement at the top of the rigid frame pier experienced a decrease at first showed an and increase trend afterwards.