本文選題：拱索支撐人行橋 + 人行荷載��； 參考：《建筑結(jié)構(gòu)》2017年S1期

【摘要】：隨著人行天橋逐漸向大跨度、輕柔化和橋型新穎別致的方向發(fā)展,由此引發(fā)的人致振動的問題日益突出。以某拱索支撐人行橋為研究對象,建立空間有限元模型研究其動力特性;選取IABSE推薦的人行荷載模型,考慮非活動人群的質(zhì)量,采用時程分析法對該橋進(jìn)行人致振動作用下舒適度的分析;根據(jù)Den Hartog提出的不考慮主結(jié)構(gòu)阻尼的最佳阻尼器參數(shù)表達(dá)式得到阻尼器的設(shè)計參數(shù),并在人行橋合適的部位設(shè)置調(diào)諧質(zhì)量阻尼器(TMD)進(jìn)行振動控制。結(jié)果表明:該人行橋具有明顯的豎向振型,且該振型的頻率與人行步頻十分接近;采用TMD進(jìn)行振動控制后,共振激勵作用下的豎向加速度減小80%~90%,并且滿足規(guī)范中對人行橋舒適度的要求;在考慮非活動人群質(zhì)量的影響后,TMD的減振效果更好。
[Abstract]:With the gradual development of footbridge to the direction of long span, soft and novel bridge type, the problem of human vibration is becoming more and more prominent. Taking a footbridge supported by arch cable as the research object, the spatial finite element model is established to study its dynamic characteristics, and the pedestrian load model recommended by IABSE is selected to consider the mass of inactive people. The time history analysis method is used to analyze the comfort of the bridge under the action of human vibration, and the design parameters of the damper are obtained according to the optimal damper parameter expression proposed by Den Hartog, which does not consider the damping of the main structure. A tuned mass damper (TMD) is installed to control the vibration of the footbridge. The results show that the bridge has obvious vertical mode, and the frequency of the mode is very close to the walking frequency, and the vibration is controlled by TMD. The vertical acceleration under resonance excitation is reduced by 80 / 9090 and meets the requirements of comfort of footbridge in the code. The effect of TMD is better after considering the influence of the mass of inactive people.
【作者單位】： 同濟(jì)大學(xué)建筑工程系;
【分類號】：U441.3;U448.11
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本文編號：1783728