BRB在近断层地震作用下曲线桥减隔震中的应用  

Application of BRB in seismic isolation of curved bridges under near-fault earthquakes

作　　者：刘蔚 胡兆同[1] 李宇[1] Liu Wei;Hu Zhao-tong;Li Yu(School of Highway,Chang’an University,Xi’an 710064,China)

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《工程抗震与加固改造》2020年第4期130-136,共7页Earthquake Resistant Engineering and Retrofitting

基　　金：陕西省自然科学基础研究计划项目(2018JM5114)。

摘　　要：为了减小曲线梁桥在近断层地震下的响应,本文在曲线梁桥的桥墩与主梁之间设置了防屈曲支撑(bucklingrestrained brace,BRB)。研究发现设置BRB能有效地减少近断层地震下主梁的位移与未设置BRB的桥墩的响应,但设置了BRB的桥墩地震响应会增大。为了解决这个问题,本文提出了BRB与铅芯橡胶支座组合使用的联合减震措施。分析结果表明,联合减震措施不仅能有效地降低设置BRB桥墩的地震响应,而且能显著减小近断层地震中主梁的位移与其他桥墩的地震响应。In order to reduce the response of curved bridge under near-fault earthquake,BRB(buckling-restrained brace)are set up between the pier and beam of curved beam bridge in this paper.It is found that setting BRB can effectively reduce the displacement of the beam and the response of the pier without BRB under the action of near-fault earthquake,but the seismic response of the pier with BRB will increase.To solve this issue,a combined seismic mitigation measure that combined use of BRB and lead rubber bearing is proposed.The results of these analyses show that combined seismic mitigation measure not only can effectively reduce the seismic response of pier with BRB but also significantly reduce the displacement of beam and seismic response of other piers under near-fault earthquake.

关 键 词：曲线桥 近断层地震 防屈曲支撑 铅芯橡胶支座 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]