步行荷载下大跨楼盖MTMD控制参数优化方法研究

发布时间：2018-11-15 07:59

【摘要】：采用多重调谐质量阻尼器(MTMD)来控制大跨楼盖由于行人引起的竖向振动,已被工程实践证明为一种行之有效的减振方法。然而由于步行荷载的时空复杂性,采用有限元时程分析方法进行MTMD最优参数设计时的计算成本过高,甚至难以实现。为此,提出一种步行荷载下大跨楼盖-MTMD参数优化的混合算法,利用有限元获得楼盖模态后再由振型分解法计算移动步行荷载引起的结构响应,进一步结合遗传算法,研究考虑结构动力特性变化的MTMD参数优化问题。最后,以某体外预应力楼盖为例进行了MTMD频率和阻尼比的优化设计,讨论了楼盖固有频率和阻尼比变化对减振效率的影响,对比了考虑与不考虑结构特征改变的MTMD参数优化结果。结果表明,所建议的混合算法可显著提升计算效率并获得优化的控制参数,可用于同类大跨楼盖MTMD控制参数设计问题。
[Abstract]:Multi-tuned mass damper (MTMD) is used to control the vertical vibration caused by pedestrians, which has been proved to be an effective vibration reduction method in engineering practice. However, due to the space-time complexity of the walking load, the calculation cost of the finite element time-history analysis method for MTMD optimal parameter design is too high, or even difficult to achieve. For this reason, a hybrid algorithm for optimizing the parameters of long-span floor and MTMD under walking load is proposed. The modal of floor is obtained by finite element method, and then the structural response caused by moving walking load is calculated by mode decomposition method, which is further combined with genetic algorithm. The optimization of MTMD parameters considering the dynamic characteristics of structures is studied. Finally, the optimal design of MTMD frequency and damping ratio is carried out by taking an external prestressed floor as an example, and the influence of the change of natural frequency and damping ratio on the vibration absorption efficiency is discussed. The optimization results of MTMD parameters considering and disregarding structural characteristics are compared. The results show that the proposed hybrid algorithm can significantly improve the computational efficiency and obtain optimized control parameters, and can be used in the design of MTMD control parameters for similar large-span floors.
【作者单位】： 同济大学土木工程防灾国家重点实验室;
【基金】：国家自然科学基金项目(51178338) 教育部新世纪优秀人才支持计划(NCET-12-0416)
【分类号】：TU311.3;TB123
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