采用减隔震装置可有效减小连续梁桥的地震反应。选取一曲线连续梁桥，根据该桥的地震反应特点，分别采用铅芯橡胶支座、粘滞阻尼器、摩擦摆支座三种减隔震装置进行减震控制。通过动力非线性时程分析，对比了三种减震装置的减震效果，发现铅芯橡胶支座和粘滞阻尼器对边墩的墩底切向反力有放大作用，摩擦摆支座对主梁位移有放大作用；三种单一的减震措施难以完全满足该曲线连续梁桥减震控制要求。为此在单一的减震措施基础上进行改进，形成混合减震控制方案。分析表明，改进的混合减震措施可以弥补单一减震措施的不足，取得良好的减震效果。
Abstract
Installing isolation bearings on bridge is the main seismic control measures for multi-span girder bridges. A continuous curved girder bridge is taken as an example, and lead-rubber bearings (LRB), viscous dampers and friction pendulum bearings (FPB) are respectively employed on this bridge to mitigate seismic response. Nonlinear dynamic analysis shows that LRB and viscous dampers may amplify the side columns’ tangential base reaction and FPB magnify displacements of girder. The three kinds of seismic control scheme can’t satisfy seismic control target. Then a comprehensive seismic mitigation measure is proposed based on the preceding comparative analysis. The results of these analyses show that the combined isolation is superior to those seismic control schemes in which only one type of isolation bearing is used, and the combined isolation scheme can be beneficial in reducing seismic responses of bridge.
关键词
曲线桥 /
铅芯橡胶支座 /
粘滞阻尼器 /
摩擦摆支座 /
混合减隔震。
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Key words
curved bridge /
lead-rubber bearing /
viscous fluid damper /
friction pendulum bearing /
combined isolation
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参考文献
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