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结合工程结构被动控制领域的研究成果及进展(以大行程板式铅剪切阻尼器为例),对罕遇地震作用下千米级斜拉桥的减震控制进行了分析研究。通过对比分析大行程板式铅剪切阻尼器、粘滞阻尼器和弹性连接三者的数值计算结果发现,只要设计时阻尼器的相关参数选择恰当,大行程板式铅剪切阻尼器的减震效果要优于弹性连接,且与粘滞阻尼器相当。同时,分析了在正常运营阶段温度作用下减震装置对结构的影响。计算结果表明,大行程板式铅剪切阻尼器对结构的附加内力并不会比弹性连接引起的附加内力大,在运营阶段对结构的影响较小。大行程板式铅剪切阻尼器不仅满足了结构减震控制中对行程的要求,而且使用寿命长,构造简单,成本低,在千米级斜拉桥的减震控制中具有良好的应用前景。
Combined with the research achievements and progress in the field of passive control of engineering structures (taking the large-stroke lead-plate shear damper as an example), the damping control of 1000-m cable-stayed bridges under rare earthquakes is analyzed. By comparing the numerical results of the large-stroke plate-lead shear dampers, viscous dampers and elastic connections, it is found that the dampening effect of the large-stroke plate lead shear dampers It is better than a flexible connection and comparable to viscous dampers. At the same time, the influence of the shock absorber on the structure under normal temperature is analyzed. The calculation results show that the additional internal force of the plate-stroke lead shear damper on the structure will not be larger than the additional internal force caused by the elastic connection, and will have less influence on the structure during the operation phase. The large-stroke plate lead shear damper not only meets the requirements for stroke control in structural damping control, but also has long service life, simple structure and low cost and has good application prospect in damping control of kilometer-class cable-stayed bridges.