本文關(guān)鍵詞： 跨線(xiàn)天橋 列車(chē)風(fēng) 人行荷載 動(dòng)力響應(yīng) 舒適評(píng)價(jià)　出處：《長(zhǎng)安大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：在我國(guó)鐵路快速發(fā)展的重要時(shí)期，鐵路客站的建設(shè)也正面臨著轉(zhuǎn)型期帶來(lái)的挑戰(zhàn)，無(wú)論是鐵路運(yùn)行速度的提升、鐵路公交化的變革甚至通過(guò)式站房空間的出現(xiàn)，，新型鐵路客站已轉(zhuǎn)變?yōu)槌鞘芯C合交通樞紐，因此鐵路跨線(xiàn)橋梁日益增加。列車(chē)大幅度提速產(chǎn)生的列車(chē)風(fēng)荷載，導(dǎo)致臨近環(huán)境空氣壓力產(chǎn)生波動(dòng)，也逐漸被學(xué)者重視，列車(chē)速度越高，對(duì)周?chē)諝獾臄_動(dòng)就越大，產(chǎn)生的壓力波也就越強(qiáng)，對(duì)列車(chē)附近建筑、設(shè)施或者人影響則越大。在鐵路站房建設(shè)中，跨線(xiàn)人行天橋是其重要組成部分，跨線(xiàn)人行橋與城市人行天橋類(lèi)似但有不同，主要區(qū)別是鐵路跨線(xiàn)人行橋受到列車(chē)風(fēng)荷載的作用，而目前關(guān)于考慮列車(chē)風(fēng)作用的跨線(xiàn)人行天橋振動(dòng)舒適度問(wèn)題的研究還尚未有資料可查詢(xún)。 本文結(jié)合實(shí)際工程，應(yīng)用有限元軟件SAP2000，對(duì)橋梁的整體模型進(jìn)行有限元模態(tài)分析，得到天橋的振型和自振頻率，運(yùn)用國(guó)內(nèi)外對(duì)列車(chē)風(fēng)特性及人行荷載的研究結(jié)果，得到沿列車(chē)運(yùn)行方向先正后負(fù)、垂直于列車(chē)運(yùn)行方向逐漸遞減的壓力變化曲線(xiàn)，并將其轉(zhuǎn)化為風(fēng)荷載模型，結(jié)合本工程特點(diǎn)確定合適的人行荷載模型，并進(jìn)行動(dòng)力響應(yīng)分析。 得到不同節(jié)點(diǎn)相應(yīng)的加速度時(shí)程曲線(xiàn)和位移時(shí)程曲線(xiàn)，分析跨線(xiàn)橋加速度最值變化規(guī)律，分析列車(chē)風(fēng)荷載對(duì)該橋的加速度影響和位移影響，結(jié)果表明，列車(chē)風(fēng)荷載對(duì)橋梁的位移影響很小，最大豎向加速度在沿列車(chē)行駛方向逐漸增大，垂直于列車(chē)運(yùn)行方向向兩側(cè)逐漸遞減，在橋梁邊緣處達(dá)到最大。對(duì)比國(guó)內(nèi)外有關(guān)人行天橋舒適度評(píng)價(jià)指標(biāo)和舒適度規(guī)范，選取幾種典型的舒適度評(píng)價(jià)標(biāo)準(zhǔn)對(duì)本工程實(shí)例進(jìn)行舒適度評(píng)價(jià)，并給出參考意見(jiàn)。
[Abstract]:In the important period of the rapid development of railway in our country, the construction of railway passenger station is also facing the challenges brought by the transition period, whether it is the improvement of railway running speed, the transformation of railway transit, or even the appearance of the space of railway station. The new type of railway passenger station has been transformed into a comprehensive urban transportation hub. As a result, the railway bridge beams are increasing day by day. The wind load of the train caused by the large increase in the speed of the train causes the fluctuation of the ambient air pressure in the vicinity, and has gradually been attached importance to by scholars. The higher the speed of the train, the greater the disturbance to the surrounding air, the stronger the pressure wave generated, and the greater the impact on the buildings, facilities or people nearby the train. In the construction of railway stations, the cross-line pedestrian overpass is an important part of it. Cross-line footbridges are similar to, but different from, urban footbridges. The main difference is that railway footbridges are subjected to train wind loads. At present, the research on vibration comfort degree of cross-line footbridge considering train wind action is not available. In this paper, the finite element modal analysis of the whole model of the bridge is carried out by using the finite element software SAP2000, and the vibration mode and the natural vibration frequency of the bridge are obtained. The results of the research on the train wind characteristics and the pedestrian load at home and abroad are used in this paper. The pressure change curve along the train running direction is first positive and then negative and gradually decreasing perpendicular to the train running direction. The curve is transformed into the wind load model and the suitable pedestrian load model is determined according to the characteristics of the project and the dynamic response analysis is carried out. The acceleration time history curve and displacement time history curve of different nodes are obtained, and the law of maximum acceleration change of span bridge is analyzed, and the influence of train wind load on acceleration and displacement of the bridge is analyzed. The results show that, The influence of train wind load on the displacement of the bridge is very small, the maximum vertical acceleration increases gradually along the train running direction, and the vertical direction decreases gradually to both sides of the train running direction. Compared with the domestic and foreign standards of comfort evaluation of footbridge, several typical comfort evaluation criteria were selected to evaluate the comfort of the project, and some reference suggestions were given.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U448.11

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