大连市某高层建筑风振和地震反应的主动质量阻尼(AMD)控制分析与设计

本文以大连市某大型高层钢筋混凝土结构为背景,进行了高层建筑结构抗风抗震的AMD主动控制分析和方案设计。首先,根据实际工程数据建立了结构动力分析的计算模型,编制了风荷载随机抽样程序,给出了用于分析的典型风荷载和地震波动荷载样本。其次,进行了脉动风荷载作用下AMD控制系统物理参数和控制算法软参数的优化分析,得到了AMD子系统的最优质量、刚度和阻尼等物理参数。然后,在AMD子系统取得最优参数的情况下,进行了结构脉动风荷载作用下和常遇地震作用下AMD主动控制的反应分析;计算结果表明,采用AMD主动控制系统可以使结构的风振加速度控制效果达40％以上,大幅度提高规范要求的风振舒适度,对常遇地震作用下位移反应的控制效果也可以达到40％左右。最后,仿真分析了AMD控制结构平动-扭转耦联振动的控制效果。此外,本文还给出了实际工程结构进行AMD主动控制设计的一般性步骤,可供类似高层建筑结构进行AMD主动控制分析和设计时参考。

Analysis and design of Active Mass Damper (AMD) control against wind and earthquake for a high-rise building in Dalian

Under the engineering background of a large scale high-rise concrete structure in Dalian, the analysis and design of employing AMD active control against wind and earthquake excitations for this building was carried out. First,the structural computation model and load model were established according to the engineering condition. Then, the optimization of physical and computational parameters for AMD subsystem was conducted under the input of gust wind load only, and optimal physical parameters were obtained as a result. Afterwards, the numerical simulation for the structure with AMD control system against strong wind and small earthquakes was carried out. The simulation results showed that the optimized AMD system could play a good role on suppressing wind and earthquake responses of such a building, i.e. 40% reduction in wind induced acceleration and 40% reduction in frequently-occurred earthquake displacement response. At last, the control of torsion vibration coupled by in-plane vibration was simulated with double AMD subsystems. In addition, the general procedures of analysis and optimum approaches of AMD control for practical engineering structures are given, and the corresponding results can be used as reference for similar control problems of other high-rise building structures.