本文選題：樓板振動(dòng) + 舒適性��； 參考：《工程力學(xué)》2014年02期

【摘要】：為評(píng)估實(shí)際樓板結(jié)構(gòu)在可能承受的人行荷載作用下的振動(dòng)性能,運(yùn)用動(dòng)力測(cè)試和數(shù)值模擬相結(jié)合的方法對(duì)某實(shí)際樓板結(jié)構(gòu)進(jìn)行了動(dòng)力特性及人行激勵(lì)下的概率性響應(yīng)分析。首先利用基于頻響函數(shù)的沖擊動(dòng)力測(cè)試,識(shí)別了樓板結(jié)構(gòu)實(shí)際的模態(tài)參數(shù)。然后考慮各行人個(gè)體產(chǎn)生激勵(lì)的差異性及隨機(jī)的人行路徑等因素,構(gòu)建了不同隨機(jī)步態(tài)參數(shù)組合的單人及人群多分量荷載模型;基于動(dòng)力測(cè)試所得的模態(tài)特性,分別計(jì)算了在所構(gòu)建的概率性荷載作用下的多模態(tài)響應(yīng);對(duì)得到的大量響應(yīng)樣本統(tǒng)計(jì)分析得到了單人及人群行走荷載下的響應(yīng)分布以及某一振動(dòng)水平發(fā)生的概率;結(jié)果表明人致振動(dòng)響應(yīng)服從近似的正態(tài)分布,行人隨機(jī)性的步態(tài)參數(shù)中步頻對(duì)響應(yīng)的分布起控制作用,此外得到的響應(yīng)分布特性可對(duì)實(shí)際樓板結(jié)構(gòu)的人致振動(dòng)進(jìn)行概率性的評(píng)估。在人群荷載響應(yīng)計(jì)算時(shí),對(duì)測(cè)得的人活動(dòng)加速度響應(yīng)進(jìn)行自由衰減響應(yīng)分析得到不同加速度水平時(shí)結(jié)構(gòu)基本模態(tài)特性的變化,結(jié)果表明頻率隨振動(dòng)加速度幅值的變化相對(duì)較小,而阻尼的變化相對(duì)較明顯。該文研究可為類似工程的人致振動(dòng)概率性評(píng)估提供參考。
[Abstract]:In order to evaluate the vibration behavior of the actual floor structure under the action of the possible pedestrian load, the dynamic characteristics and the probabilistic response of a practical floor structure under pedestrian excitation are analyzed by using the method of dynamic test and numerical simulation. Firstly, the actual modal parameters of floor structure are identified by the impact dynamic test based on frequency response function (FRF). Then considering the difference of individual excitation and random walking path, the single and crowd multi-component load models with different random gait parameter combinations are constructed, which are based on the modal characteristics of dynamic test. The multimodal response under the constructed probabilistic load is calculated, and the response distribution under the walking load and the probability of a certain vibration level are obtained by statistical analysis of a large number of response samples. The results show that the response of human induced vibration is controlled by the approximate normal distribution, and the gait frequency plays a controlling role in the random gait parameters of pedestrians. In addition, the response distribution characteristics obtained can be used to evaluate the probability of human induced vibration of the actual floor structure. When the load response of the crowd is calculated, the free attenuation response of the measured acceleration response is analyzed to obtain the change of the basic modal characteristics of the structure with different acceleration levels. The results show that the frequency varies relatively little with the amplitude of the vibration acceleration. The change of damping is relatively obvious. This study can be used as a reference for the probabilistic evaluation of human induced vibration in similar projects.
【作者單位】： 蘭州理工大學(xué)甘肅省土木工程防災(zāi)減災(zāi)重點(diǎn)實(shí)驗(yàn)室;蘭州理工大學(xué)防震減災(zāi)研究所;
【基金】：甘肅省科技攻關(guān)項(xiàng)目(2GS057-A52-008)
【分類號(hào)】：TU311.3

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7 郝婷s，

本文編號(hào)：1820666