对跨海桥梁震浪响应的半主动控制策略

发布时间：2018-07-15 09:15

【摘要】：建立了桥梁震浪响应的磁流变液阻尼器(MRD)控制方程,首先将MRD在下一时刻的出力预测值作为半主动控制系统的限界约束,并构造适合MRD的剪切型最优(CO)半主动控制目标函数;然后基于精细积分法把MRD半主动控制策略等效为一列在附加限界约束内使目标函数取最小值的方程组;最后利用可靠区理论求解方程组得到MRD的半主动控制力.以一座三跨跨海公路连续梁桥为工程背景,分别对其在未控制、TRIO半主动控制、CO半主动控制和线性二次型最优(LQR)主动控制下的各评价指标进行了数值计算.结果表明:提出的TRIO半主动控制策略在降低桥梁震浪响应方面比传统的CO半主动控制的效果显著;TRIO半主动控制的MRD控制力峰值逼近LQR主动控制的,对外界能源的利用率比LQR策略的要高得多.
[Abstract]:The magneto-rheological fluid damper (MRD) governing equation of bridge shock wave response is established. First, the prediction value of MRD force at the next moment is taken as the limit constraint of semi-active control system, and the shear optimal (CO) semi-active control objective function suitable for MRD is constructed. Then, based on the precise integration method, the semi-active control strategy of MRD is equivalent to a set of equations in which the objective function is minimized within the additional limit constraints, and the semi-active control force of MRD is obtained by solving the equations by using the reliability region theory. Based on the engineering background of a continuous girder bridge of a three-span cross-sea highway, the evaluation indexes of the bridge under semi-active CO control and linear quadratic optimal (LQR) active control of uncontrolled trio are calculated numerically respectively. The results show that the proposed trio semi-active control strategy is more effective than the conventional CO semi-active control in reducing the seismic response of bridges. The MRD control peak of trio semi-active control approaches the LQR active control. External energy utilization is much higher than the LQR strategy.
【作者单位】：东南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51078077) “十二五”国家科技支撑计划资助项目(2012BAJ14B00)
【分类号】：U442.55

【共引文献】