强震作用下连续梁桥多墩联合半主动控制

为了平均分配连续梁桥各墩的损伤,提出了一种多墩联合半主动控制算法.该控制算法在主动最优控制力的基础上,综合考虑连续梁桥各墩的损伤状态,通过调整阻尼器的目标出力,在主梁加速度和各桥墩的墩顶与主梁间相对位移得到控制的同时,使各桥墩的损伤指数平均分配.本文以一设置了磁流变(MR)阻尼器的3跨连续梁桥为研究对象,采用MATLAB进行数值模拟分析,对所提出的半主动控制算法进行了多种工况下的验证.计算结果表明,采用多墩联合半主动控制算法能够较好地控制桥梁的地震反应,同时有效降低破坏最严重的桥墩在强震过程中的损伤指数,达到各桥墩损伤平均分配的效果.

Continuous Beam Bridge Multi-Pier Joint Semi-Active Control Under Strong Earthquake

For the purpose of evenly distributing the pier damage of continuous beam bridge, a multi-pier joint semi- active control algorithm is proposed. On the basis of active optimal control, considering the damage state of the continuous beam bridge pier, this control algorithm controls the acceleration of the beam and the relative displacement between the top of each pier and the beam and meanwhile evenly distributes the damage index of each pier by adjusting the target output of dampers. A three-span continuous beam bridge equipped with magnetorheological （MR） dampers is numerically studied with MATLAB and several scenarios are simulated to validate the proposed semi-active control algorithm. The results indicate that the proposed algorithm is well capable of controlling seismic response and effectively reducing the damage index of the pier which suffers the most serious damage, thus achieving the effect that the damage of each pier is evenly distributed.