【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(dòng),已被工程實(shí)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(shí)空復(fù)雜性,采用有限元時(shí)程分析方法進(jìn)行MTMD最優(yōu)參數(shù)設(shè)計(jì)時(shí)的計(jì)算成本過高,甚至難以實(shí)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(jì)算移動(dòng)步行荷載引起的結(jié)構(gòu)響應(yīng),進(jìn)一步結(jié)合遺傳算法,研究考慮結(jié)構(gòu)動(dòng)力特性變化的MTMD參數(shù)優(yōu)化問題。最后,以某體外預(yù)應(yīng)力樓蓋為例進(jìn)行了MTMD頻率和阻尼比的優(yōu)化設(shè)計(jì),討論了樓蓋固有頻率和阻尼比變化對(duì)減振效率的影響,對(duì)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(jì)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(jì)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(jì)大學(xué)土木工程防災(zāi)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51178338) 教育部新世紀(jì)優(yōu)秀人才支持計(jì)劃(NCET-12-0416)
【分類號(hào)】：TU311.3;TB123
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本文編號(hào)：2332673