地震作用下三相邻结构控制体系动力响应分析

Dynamic response analysis of three adjacent structure control systems under earthquake

为解决两相邻结构同频共振导致结构抗震失效问题,提出一种三相邻结构的减震控制策略。利用单自由度和多自由度力学简化模型,基于Clough-Penzien谱推导相应的随机拓展状态方程,并研究三相邻结构在不同组合方案下各参数对减震效果的影响规律;基于结构振动总能量最小原则,利用改进遗传算法对减震控制方案进行了优化,得到对应控制方案下阻尼器布置的数量和位置,输入谱模型,分析了控制方案对高阶响应的抑制效果及该体系在7组地震动作用下的减震控制性能。结果表明,三相邻结构可以有效地解决两相邻结构同频共振的减震控制失效问题,抑制高阶响应,并能有效地降低地震响应,具有较好的鲁棒性。

In order to solve the problem of seismic failure caused by co-frequency resonance of two adjacent structures,a damping control strategy for threeadjacent structures was proposed.Based on the Clough-Penzien spectrum,the corresponding stochastic extended state equation was derived by using single-degree-of-freedom and multi-degree-of-freedom mechanical simplified models,and the influence of parameters on the damping effect of threeadjacent structures under different combinations was studied.Based on the principle of minimizing the total energy of structural vibration,an improved genetic algorithm was used to optimize the damping control scheme,and the number and location of dampers under the corresponding control scheme were obtained.The spectral model was input to analyze the inhibitory effect of the control scheme on the high-order response,and the damping control performance of the system under seven groups of ground motions was analyzed.Results show that the three adjacent structures can effectively solve the failure problem of damping control of the same frequency resonance of two adjacent structures,suppress the high-order response,and effectively reduce the seismic response,and have good robustness.