【摘要】：探索符合實(shí)際交通現(xiàn)狀的汽車荷載模型,對橋梁設(shè)計(jì),可靠性評估和維修加固決策等均具有十分重要的現(xiàn)實(shí)意義。隨著大跨徑橋梁的不斷修建,其汽車荷載不再適合用傳統(tǒng)的靜態(tài)車隊(duì)模型去模擬。工程界對動(dòng)態(tài)車流荷載模型的需求越來越迫切�，F(xiàn)有的元胞自動(dòng)機(jī)交通流模型(CA)能出色地完成對動(dòng)態(tài)車流的模擬。如何將傳統(tǒng)的CA模型運(yùn)用到車流荷載的模擬中是本文研究的主要內(nèi)容。首先,在前人研究成果的基礎(chǔ)上,本文得出了將汽車荷載融入到CA模型中是可行的這一結(jié)論。然后,簡述了已有成果的待改進(jìn)之處,指出要在幾個(gè)關(guān)鍵的問題上有所突破,才能徹底將汽車荷載和CA模型結(jié)合起來。為了達(dá)到這個(gè)目的,本文對傳統(tǒng)CA模型的元胞長度,邊界條件進(jìn)行了修改,并重新推導(dǎo)了車輛的狀態(tài)更新公式。尤其提出了一種新的荷載加載方式,使得利用CA模型進(jìn)行影響線加載成為了可能,并且這種加載能在任意精度上進(jìn)行控制。經(jīng)過一系列改造后,本文對改造后的新程序進(jìn)行了試驗(yàn)驗(yàn)證。驗(yàn)證結(jié)果表明,新程序能準(zhǔn)確模擬交通狀況和汽車荷載。最后,將本程序分別應(yīng)用到了簡支梁橋和斜拉橋中。應(yīng)用到簡支梁橋中,既計(jì)算了幾座標(biāo)準(zhǔn)跨徑簡支梁橋在1個(gè)月實(shí)測車流荷載作用下的響應(yīng),并與JTG D60-2004規(guī)范和JTG B01-2014規(guī)范中公路Ⅰ級標(biāo)準(zhǔn)值產(chǎn)生的效應(yīng)做了對比;又通過與靜態(tài)荷載結(jié)果對比驗(yàn)證了程序的正確性。在應(yīng)用到斜拉橋時(shí),對比分析了索力和關(guān)鍵截面處的效應(yīng)在隨機(jī)車流荷載和公路Ⅰ級荷載下的區(qū)別,為斜拉橋的優(yōu)化設(shè)計(jì)提供了一些參考。
[Abstract]:It is very important for bridge design, reliability evaluation and maintenance and reinforcement decision to explore the vehicle load model which accords with the actual traffic situation. With the continuous construction of long span bridges, the vehicle loads are no longer suitable to be simulated by the traditional static motorcade model. The demand of dynamic vehicle load model is more and more urgent in engineering field. The existing Cellular Automata (CA) traffic flow model (CA) can do well in simulating the dynamic traffic flow. How to apply the traditional CA model to the simulation of vehicle flow load is the main content of this paper. Firstly, on the basis of the previous research results, this paper draws the conclusion that it is feasible to incorporate the vehicle load into the CA model. Then, the improvement of the existing achievements is briefly introduced, and it is pointed out that some breakthroughs should be made on several key issues before the vehicle load and CA model can be thoroughly combined. In order to achieve this goal, the cell length and boundary conditions of the traditional CA model are modified, and the vehicle state update formula is rededuced. In particular, a new loading mode is proposed, which makes it possible to use the CA model to load the influence line, and the load can be controlled with arbitrary precision. After a series of revamping, the new program is tested and verified in this paper. The results show that the new program can accurately simulate traffic conditions and vehicle loads. Finally, the program is applied to simply supported beam bridge and cable-stayed bridge respectively. Applied to simply supported beam bridge, the response of several standard span simple supported beam bridges under one month traffic load is calculated, and compared with the effect of highway grade I standard value in JTG D60-2004 code and JTG B01-2014 code. The correctness of the program is verified by comparing with the static load results. When applied to cable-stayed bridge, the difference between cable force and effect at key section under random traffic load and highway first class load is analyzed, which provides some references for the optimum design of cable-stayed bridge.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441.2

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相關(guān)期刊論文 前1條

1 陳向東;金先龍;張曉云;李政;;基于元胞自動(dòng)機(jī)的路面車流荷載[J];上海交通大學(xué)學(xué)報(bào);2008年06期

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本文編號：2264239