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为减小不等墩高的非规则连续梁桥的低墩地震损伤集中,研究橡胶支座布置对它的影响趋势,以5座非规则连续梁桥为研究对象,通过橡胶支座布置,使得不同墩高的桥墩刚度接近或相同,然后通过建立有限元模型,分析了桥梁的弹塑性地震反应,并进行了理论分析比较。研究结果表明:低墩采用柔性橡胶支座时,在低墩屈服之前,可以有效改善非规则连续梁桥的地震反应,减小低墩的地震损伤;在低墩屈服以后,改善效果明显降低,低墩仍然存在地震损伤集中;对于一座具体的非规则连续梁桥,首先需要根据设计地震输入,选择高、低墩的合理损伤状态组合,然后合理布置不同刚度的橡胶支座。
In order to reduce the concentration of seismic damage of low pier with irregular pier with irregular piers, the influence of rubber bearing arrangement on it is studied. Five non-regular continuous girder bridges are taken as the research object. Through rubber bearing arrangement, The stiffness of piers with different piers is close or the same, and then the elasto-plastic seismic response of the bridge is analyzed by establishing the finite element model. The theoretical analysis and comparison are also made. The results show that the seismic response of the irregular continuous girder bridge can be effectively improved and the seismic damage of the low pier reduced before the low pier yielding when the flexible pier with low pier is used. After the low pier yield, the improvement effect is obviously reduced, For a specific irregular continuous girder bridge, firstly, according to the design earthquake input, the reasonable damage state combination of high and low piers should be selected, and then the rubber bearings of different stiffness should be reasonably arranged.