本文選題：連續(xù)彎梁橋　切入點(diǎn)：車橋耦合　出處：《長(zhǎng)安大學(xué)》2016年碩士論文

【摘要】：目前多數(shù)混凝土曲線梁橋存在橫向爬移的現(xiàn)象,針對(duì)這一病害的多因素分析,不少學(xué)者發(fā)現(xiàn)汽車產(chǎn)生的離心力是其主要因素之一,對(duì)于汽車行駛中的橋梁來(lái)說(shuō),其實(shí)際離心力值是一個(gè)隨車速、曲率半徑、以及橋梁結(jié)構(gòu)形式等條件的不同而變化的值,梁體在離心力與橫豎向車橋耦合作用下發(fā)生振動(dòng),進(jìn)而影響支座摩阻力。當(dāng)支座摩阻力在各種外界因素與汽車離心力作用下累計(jì)值增大到一定的程度時(shí)候,就會(huì)對(duì)支座造成破壞,從而使主梁梁體橫向位移增加。對(duì)于彎梁橋橫向力的分析,本文做了以下工作:1、本文結(jié)合國(guó)內(nèi)外研究現(xiàn)狀,分析了車輛與橋梁耦合振動(dòng)規(guī)律特性,運(yùn)用LS-DYNA程序建立了車輛橋梁相互作用下的可視化模型,并通過(guò)理論解進(jìn)行驗(yàn)證該程序的可行性。2、本文通過(guò)仿真計(jì)算得出理論計(jì)算的橫向力數(shù)值較小。模型分別考慮了不同超高、速度、與半徑、路面不平整等參數(shù),仿真計(jì)算得出了車橋耦合作用下汽車離心力的數(shù)值,得出了規(guī)范計(jì)算的離心力系數(shù)值偏小。3、成功的繪制了各支座在不同條件下的徑向力時(shí)程曲線。通過(guò)現(xiàn)有增大的離心力數(shù)值模型,對(duì)車輛偏心行駛、車輛制動(dòng)、支座偏心布置下支座橫向力的計(jì)算,得到汽車行駛的過(guò)程中在各工況下的支座橫向力值,并繪制了相關(guān)時(shí)程曲線。在得出上述結(jié)論之后,本文通過(guò)各參數(shù)影響的大小,對(duì)所建立的模型進(jìn)行進(jìn)一步優(yōu)化,使得模型更能準(zhǔn)確的接近實(shí)際情況,為同類橋型的橫向力分析提出了建議與參考。
[Abstract]:At present, most concrete curved girder bridges have the phenomenon of lateral movement. In view of the multi-factor analysis of this disease, many scholars find that the centrifugal force generated by the automobile is one of the main factors, and for the bridge in the vehicle running,The actual centrifugal force is a value varying with the speed, radius of curvature and structure of the bridge. The beam vibrates under the coupling of centrifugal force and vertical vehicle-bridge, and then affects the friction of the bearing.When the frictional resistance of the bearing increases to a certain extent under the action of various external factors and the centrifugal force of the automobile, the bearing will be destroyed and the transverse displacement of the main beam body will be increased.For the analysis of transverse force of curved girder bridge, this paper does the following work: 1. Combining with the current research situation at home and abroad, this paper analyzes the characteristics of coupling vibration between vehicle and bridge, and establishes the visual model of vehicle-bridge interaction by using LS-DYNA program.The feasibility of the program is verified by theoretical solution. In this paper, the numerical value of lateral force calculated by simulation is smaller.The model takes into account different parameters, such as ultra-high, velocity, radius and uneven road surface, respectively. The numerical value of vehicle centrifugal force under the coupling of vehicle and bridge is obtained by simulation.The value of centrifugal force coefficient calculated by code is small. 3, and the radial force history curve of each support under different conditions is drawn successfully.Based on the existing numerical model of increasing centrifugal force, the lateral force of the support under eccentric driving, braking and eccentricity arrangement of the vehicle is calculated, and the lateral force of the support in the process of driving is obtained.The related time history curve is drawn.After reaching the above conclusion, the model is further optimized by the influence of each parameter, which makes the model more accurate and close to the actual situation, and puts forward some suggestions and references for the lateral force analysis of the similar bridge type.
【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】：2016
【分類號(hào)】：U441

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本文編號(hào)：1728107