复合式金属阻尼器在曲线梁桥减震控制中的应用研究

Study of the application of a Metal Alloy Brace on seismic control of curved bridges

为了研究复合式金属阻尼器在曲线梁桥减震控制中的应用效果,以一座曲线连续梁桥为例,对其进行了地震作用下的动力弹塑性分析,研究了复合式金属阻尼器在曲线梁桥减震控制上的应用,并且与安装了传统防落梁装置的曲线梁桥结构的地震响应进行了对比.研究结果表明：复合式金属型阻尼器对支座变形的减震率在55％～65％之间,对固定墩墩底弯矩的减震率在50％～55％之间,可以有效地降低曲线梁桥结构在地震中的响应;与传统的防落梁转置相比,复合式金属型阻尼器在地震作用下有着良好的滞回耗能能力,使桥梁具有较高的安全储备,在桥梁的抗震设计中可以取代传统的防落梁拉杆装置;当支座出现较大变形的时候,复合式金属型阻尼器的出力在较小位移下能显著提高,起到限位的作用,防止支座破坏和落梁的发生.

To study the effect of the Metal Alloy Brace （MAB） on the seismic control of curved bridges, this paper presents an elastic- plastic dynamic analysis for a curved bridge under seismic excitations, comparing the seismic responses of curved bridges with the MAB and the one with the Anti-Drop-Beam Device（ADBD）. The results show that the MBA can effectively reduce the seismic response of curved bridge with the shock absorption rate between 55% -65% for the bearing displacements and the shock absorption rate between 50% -55% for the moments of fix bent bottom. The traditional ADBD can be replaced by the MAB since the MAB has a good capability of hysteretic energy, which can improve the security reserve of the curved bridges, comparing with the traditional ADBD ; When the bearing displacements are larger, the MAB can produce larger force under smaller displacements to limit the bearing displacements and prevent the bearing failure and girder falling.