發(fā)布時(shí)間：2018-02-05 05:26

  本文關(guān)鍵詞： 人結(jié)相互作用 振動(dòng)舒適度 質(zhì)量塊-阻尼器模型 彈簧-質(zhì)量塊-阻尼器模型　出處：《振動(dòng)工程學(xué)報(bào)》2016年05期 　論文類型：期刊論文

【摘要】：大跨輕柔結(jié)構(gòu)易出現(xiàn)行人荷載下的振動(dòng)舒適度問題,行人與結(jié)構(gòu)的相互作用是準(zhǔn)確預(yù)測人致結(jié)構(gòu)振動(dòng)的關(guān)鍵難題之一。通過一低頻人行橋的小組行人試驗(yàn),研究了兩種豎向人-結(jié)相互作用模型的參數(shù)及其適用性問題。首先由試驗(yàn)獲得空橋和有行人時(shí)的系統(tǒng)頻響函數(shù)。隨后,將行人的質(zhì)量-阻尼器(Mass-Damper,MD)模型和本文建議的彈簧-質(zhì)量-阻尼器(Spring-Mass-Damper,SMD)模型,分別與結(jié)構(gòu)耦合并推導(dǎo)耦合系統(tǒng)的頻響函數(shù)理論表達(dá)式,再擬合實(shí)測值識(shí)別MD和SMD模型的參數(shù)。結(jié)果表明:試驗(yàn)條件下行人對(duì)結(jié)構(gòu)質(zhì)量貢獻(xiàn)約為體重的40%,阻尼貢獻(xiàn)為1400kg/s。行人SMD模型的自振頻率約為1.9Hz,阻尼比約30%。行人SMD模型參數(shù)尚無其他文獻(xiàn)報(bào)道,與不同姿態(tài)靜止人體的SMD參數(shù)的對(duì)比說明了結(jié)果的合理性。最后,利用數(shù)值模擬解釋了MD模型的局限性,建議采用SMD模型模擬豎向行人-結(jié)構(gòu)相互作用。
[Abstract]:The problem of vibration comfort under pedestrian load is easy to occur in long-span soft structures. The interaction between pedestrians and structures is one of the key problems in predicting the vibration of human-induced structures accurately. A group pedestrian test of a low-frequency footbridge is carried out. In this paper, the parameters and applicability of two vertical human-junction interaction models are studied. First, the frequency response function of the empty bridge and the system with pedestrian is obtained. The mass-damper (Mass-Dampern MDM) model of pedestrians and the Spring-Mass-Damperpern SMD model proposed in this paper are presented. The theoretical expressions of the frequency response function of the coupled system are derived respectively by coupling with the structure. The parameters of MD and SMD models are identified by fitting the measured values. The results show that the pedestrian contribution to the structure mass is about 40% of the body weight under the experimental conditions. The damping contribution is 1 400 kg / s. The natural vibration frequency of pedestrian SMD model is about 1.9 Hz and the damping ratio is about 30. The parameters of pedestrian SMD model have not been reported in other literatures. The comparison with the SMD parameters of stationary human body with different attitude shows the rationality of the results. Finally, the limitation of MD model is explained by numerical simulation. SMD model is proposed to simulate vertical pedestrian-structure interaction.
【作者單位】： 同濟(jì)大學(xué)土木工程防災(zāi)國家重點(diǎn)實(shí)驗(yàn)室;中國海誠工程科技股份有限公司;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51478346)
【分類號(hào)】：TU317
【正文快照】： 引言對(duì)于固有頻率接近人體步行頻率的大跨度樓蓋、人行橋或人行連廊等,人群的正常走動(dòng)可能導(dǎo)致較大幅度的結(jié)構(gòu)振動(dòng)。過大的結(jié)構(gòu)振動(dòng)會(huì)使使用者感到不適,從而影響結(jié)構(gòu)的使用性能。倫敦的千禧橋就因過大的橫向振動(dòng)在使用的第一天被迫封閉,直到兩年后安裝阻尼器解決振動(dòng)問題后才

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