本文選題：中承鋼管混凝土拱橋 + 人群荷載��； 參考：《長(zhǎng)安大學(xué)》2014年碩士論文

【摘要】：現(xiàn)代人行天橋向著大跨、輕柔的方向發(fā)展，人行天橋的舒適度問(wèn)題引起了越來(lái)越多的人關(guān)注。本文應(yīng)用有限元軟件SAP2000，結(jié)合鲅魚(yú)圈跨金港路人行天橋?qū)嵗�，�?duì)中承式鋼管混凝土人行天橋進(jìn)行了靜力分析、模態(tài)分析、動(dòng)力響應(yīng)分析、舒適度評(píng)價(jià)以及影響鋼管混凝土拱橋舒適度因素的研究。 中承式鋼管混凝土人行天橋靜力分析和模態(tài)分析表明該橋的內(nèi)力、撓度、應(yīng)力比、自振頻率等參數(shù)均滿(mǎn)足規(guī)范要求。天橋在腳步荷載作用下的動(dòng)力響應(yīng)分析，求到該天橋的加速度、速度、位移等動(dòng)力響應(yīng)值的時(shí)程曲線(xiàn)，表明天橋舒適度滿(mǎn)足相關(guān)規(guī)范要求。借鑒煩惱率對(duì)人行天橋的舒適度研究，分析表明天橋自振頻率較低，與人的腳步荷載頻率2.0Hz相差較大，天橋豎向煩惱率為0.1253，即天橋上有12.53%的行人的人感到不適，小于假設(shè)標(biāo)準(zhǔn)20%，綜合判斷滿(mǎn)足人行荷載作用下舒適度要求。 在符合結(jié)構(gòu)安全的條件下，吊桿的數(shù)量以及布置形式的變化對(duì)天橋結(jié)構(gòu)舒適度影響很��；橫撐形式、位置的對(duì)于橋梁的舒適度有一定影響，當(dāng)橫撐布置在拱肋與橋面板連接處對(duì)結(jié)構(gòu)更有利，，采用X型橫撐比平行橫撐更有利于天橋舒適度；天橋的煩惱率隨著拱肋的減小而增大，拱肋直徑越小對(duì)煩惱率影響程度越大。拱肋直徑及拱肋的含鋼率是天橋舒適度主要影響因素，吊桿和橫撐的布置影響較小。 本文橋梁的吊桿設(shè)計(jì)比較保守，建議減半吊桿數(shù)量，拱肋直徑取650mm，以?xún)?yōu)化結(jié)構(gòu)設(shè)計(jì)。
[Abstract]:Modern footbridge is developing towards the direction of long span and soft. The comfort of footbridge has attracted more and more people's attention. In this paper, the finite element software SAP2000 is applied to the static analysis, modal analysis and dynamic response analysis of the through concrete filled steel tube footbridge. The evaluation of comfort and the factors affecting the comfort of concrete-filled steel tubular arch bridge are studied. The static analysis and modal analysis show that the internal force, deflection, stress ratio and natural vibration frequency of the bridge meet the requirements of the code. By analyzing the dynamic response of the flyover under the footstep load, the time-history curves of the dynamic response values such as acceleration and displacement of the flyover are obtained, which indicates that the comfort degree of the flyover meets the requirements of the relevant specifications. Based on the study of comfort degree of footbridge, the analysis shows that the natural vibration frequency of footbridge is lower, and the frequency of footwork load is 2.0Hz. The vertical vexation rate of flyover is 0.1253, that is, the people who have 12.53% of pedestrians on the flyover feel uncomfortable. Less than the assumed standard 20, the comprehensive judgment meets the requirement of comfort under the action of pedestrian load. Under the condition of structural safety, the number of suspenders and the change of arrangement form have little influence on the comfort degree of the bridge structure, while the type of horizontal brace and position have certain influence on the comfort degree of bridge. When the transverse brace is arranged at the joint of arch rib and bridge deck, it is more favorable for the structure to adopt X-type transverse brace than parallel transverse brace, and the vexation rate of overpass increases with the decrease of arch rib, and the smaller the arch rib diameter, the greater the influence of arch rib diameter on the vexation rate. The diameter of arch rib and the steel content of arch rib are the main factors affecting the comfort of overpass, but the arrangement of suspender and transverse brace has little effect. The design of suspension rod is conservative in this paper. It is suggested to halve the number of suspenders and take 650mm arch rib diameter to optimize the structural design.
【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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