【摘要】：采用多重調(diào)諧質(zhì)量阻尼器(MTMD)來控制大跨樓蓋由于行人引起的豎向振動,已被工程實踐證明為一種行之有效的減振方法。然而由于步行荷載的時空復雜性,采用有限元時程分析方法進行MTMD最優(yōu)參數(shù)設(shè)計時的計算成本過高,甚至難以實現(xiàn)。為此,提出一種步行荷載下大跨樓蓋-MTMD參數(shù)優(yōu)化的混合算法,利用有限元獲得樓蓋模態(tài)后再由振型分解法計算移動步行荷載引起的結(jié)構(gòu)響應,進一步結(jié)合遺傳算法,研究考慮結(jié)構(gòu)動力特性變化的MTMD參數(shù)優(yōu)化問題。最后,以某體外預應力樓蓋為例進行了MTMD頻率和阻尼比的優(yōu)化設(shè)計,討論了樓蓋固有頻率和阻尼比變化對減振效率的影響,對比了考慮與不考慮結(jié)構(gòu)特征改變的MTMD參數(shù)優(yōu)化結(jié)果。結(jié)果表明,所建議的混合算法可顯著提升計算效率并獲得優(yōu)化的控制參數(shù),可用于同類大跨樓蓋MTMD控制參數(shù)設(shè)計問題。
[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.
【作者單位】： 同濟大學土木工程防災國家重點實驗室;
【基金】：國家自然科學基金項目(51178338) 教育部新世紀優(yōu)秀人才支持計劃(NCET-12-0416)
【分類號】：TU311.3;TB123
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本文編號：2332673