本文選題：剛構(gòu)拱組合橋 + 梁格法��； 參考：《北京交通大學(xué)》2017年碩士論文

【摘要】：隨著我國高速鐵路梁橋的快速發(fā)展和行車速度不斷提升,越來越多的大跨度橋梁的被應(yīng)用于橋梁建設(shè)之中,這些都對數(shù)值仿真模擬計(jì)算橋梁結(jié)構(gòu)特性提出了必然的要求�，F(xiàn)有的橋梁有限元結(jié)構(gòu)計(jì)算中主要依托單一梁體模型和精細(xì)化的橋梁實(shí)體模型進(jìn)行計(jì)算,但單一梁體模型不能反應(yīng)細(xì)部結(jié)構(gòu)變化,模型較為"粗糙"實(shí)體模型隨著橋梁跨度的增加,節(jié)點(diǎn)和單元數(shù)量的增多會產(chǎn)生巨大的計(jì)算量,不便于進(jìn)行研究計(jì)算。因此需要針對橋梁結(jié)構(gòu)進(jìn)行簡化模型計(jì)算。剪力柔性梁格法是針對混凝土橋梁較為常用的橋梁結(jié)構(gòu)簡化方法之一,但其簡化過程是基于結(jié)構(gòu)各項(xiàng)剛度進(jìn)行的靜力簡化,結(jié)構(gòu)動力特性是否與原結(jié)構(gòu)一致還有待驗(yàn)證。因此,針對以上問題,本文著力于梁拱組合橋靜動力性能分析及其研究,主要進(jìn)行了以下幾個(gè)方面的工作。(1)系統(tǒng)梳理了梁拱組合橋的國內(nèi)外的工程案例以及發(fā)展現(xiàn)狀,對近年來國內(nèi)外拱橋有限元分析成果、穩(wěn)定理論等相關(guān)內(nèi)容進(jìn)行了總結(jié)概述。介紹和梳理了本文研究所要使用的梁格計(jì)算理論和多體動力學(xué)相關(guān)建模理論,為計(jì)算和研究奠定理論基礎(chǔ)。(2)基于高速鐵路常用橋梁結(jié)構(gòu)的剛構(gòu)拱組合橋進(jìn)行有限元計(jì)算,分別建立了單一梁體模型和梁格模型,對兩種模型的靜動力特性進(jìn)行了驗(yàn)證,通過靜力特性對比驗(yàn)證了模型計(jì)算的可靠性,通過模態(tài)分析對比兩類模型結(jié)果差異,通過模態(tài)的數(shù)值和形狀對比驗(yàn)證梁格模型可用于動力計(jì)算。(3)將有限元軟件MIDAS/CIVIL中計(jì)算的橋梁結(jié)構(gòu)數(shù)據(jù)結(jié)果,導(dǎo)入有限元軟件ANSYS中并與多體動力學(xué)軟件UM結(jié)合起來,計(jì)算了基于梁格法建模的車橋耦合振動響應(yīng),并根據(jù)規(guī)范對車輛的走行性進(jìn)行了驗(yàn)證。驗(yàn)證了車輛在150km/h～250km/h行駛速度下,車輛豎向加速度最大值為1.118m/s2,橫向加速度最大值為0.862m/s2,輪對的減載率最大值為0.372,脫軌系數(shù)最大值為0.218,輪重減載率小于第二限度0.6。車輛脫軌系數(shù)小于第二限度1.0,列車能安全行駛通過橋梁。橋梁中跨跨中的豎向撓度最大值為6.096mm,橫向撓度值為5.092mm,均滿足預(yù)應(yīng)力混凝土橋梁豎向撓度要求和橋梁橫向振幅要求限值。橋梁、車輛響應(yīng)結(jié)果均滿足走行性安全標(biāo)準(zhǔn),車輛能夠安全行駛通過基于梁格簡化的橋梁結(jié)構(gòu)。(4)以基于梁格法的模型基礎(chǔ)參數(shù)入手,研究結(jié)構(gòu)在變參數(shù)下的梁格結(jié)構(gòu)的動力特性變化。對剛度、拱肋剛度變化下的結(jié)構(gòu)各階模態(tài)的數(shù)值和形狀變化進(jìn)行了分析和驗(yàn)證,發(fā)現(xiàn)橋梁結(jié)構(gòu)中拱肋剛度變化對結(jié)構(gòu)自振特性影響相對較大,變參數(shù)下的結(jié)構(gòu)自振特性只發(fā)生了數(shù)值變化,未出現(xiàn)振型形狀變化。(5)對比在不同時(shí)速下,橋梁結(jié)構(gòu)參數(shù)對其車橋耦合響應(yīng)結(jié)果的影響,在考慮車輛行駛速度的影響下,針對梁格法橋梁的動力特性進(jìn)行分析。發(fā)現(xiàn)梁格變參數(shù)對橋梁動力性能的影響主要通過參數(shù)變化對結(jié)構(gòu)自身剛度的影響來實(shí)現(xiàn),并在研究基于梁格法簡化的橋梁動力性能的過程中,從橋梁的各階模態(tài)分析入手,針對結(jié)構(gòu)的模態(tài)進(jìn)行參數(shù)優(yōu)化。本文通過數(shù)據(jù)對比研究為梁格法簡化的橋梁結(jié)構(gòu)車橋耦合動力性能分析提供參數(shù)優(yōu)化依據(jù)。
[Abstract]:With the rapid development of China's high-speed railway bridge and train speed increasing, more and more long span bridges are used in bridge construction, the numerical simulation of the simulation of the necessary calculation of structure characteristics of bridge is proposed. The structure of the existing bridge finite element calculation is mainly based on single beam model and refined Bridge model to calculate, but single beam model can not reflect the detailed structure changes, the model is "rough" solid model with the increase of bridge span, increase in the number of nodes and units will have a huge amount of computation and is not easy to study. Therefore we need to calculate the bridge structure simplified model for calculating shear flexible beam. Is one of the methods based on the simplified method of bridge structure of concrete bridge is more commonly used, but its simplified process is simplified the structure static stiffness based on structure Whether the dynamic characteristics consistent with the original structure remains to be verified. Therefore, in view of the above problems, this paper focuses on the composite arch bridge static and dynamic performance analysis and research, mainly in the following aspects. (1) describe the domestic and foreign engineering case beam arch bridge and the development of the status quo, in China in recent years the outer arch bridge finite element analysis results, stability theory and other related content are summarized. This paper introduces and clarifies the grillage Institute to use the calculation theory and multi-body dynamics modeling theory, which lays the theoretical foundation for the calculation and research. (2) commonly used in high-speed railway bridge of rigid frame arch composite bridge finite element based on the calculation, the single beam model and grillage model are established, the static and dynamic characteristics of the two models is validated, the reliability model of calculation is verified by comparing the static characteristics, through modal Comparative analysis of two kinds of model results, by comparing the numerical and modal shape verification grillage model can be used for dynamic calculation. (3) the calculation of the finite element software MIDAS/CIVIL bridge structure data into the finite element software ANSYS and multi-body dynamics software UM combined calculation of vehicle bridge coupling vibration of the grillage model based on response, and according to the specification of the vehicle running safety was verified. Verify the vehicle in the 150km/h ~ 250km/h speed, vehicle vertical acceleration maximum lateral acceleration is 1.118m/s2, the maximum value is 0.862m/s2, the wheel load reduction rate of the maximum value is 0.372, the derailment coefficient maximum value is 0.218, wheel load reduction the rate of less than second 0.6. limit vehicle derailment coefficient is less than second limit of 1, the train can be safe driving through the bridge. The bridge across the maximum vertical deflection is 6.096mm, lateral deflection value is 5.092mm That satisfies the lateral amplitude of vertical deflection of prestressed concrete bridge and Bridge limit. The bridge vehicle response results satisfy walking safety standard, the vehicle can be safely driven by bridge girder based on simplified. (4) to start the foundation of grillage method based on model parameters, change dynamic characteristic of structure change the grillage structure parameters. On the stiffness, analyze and validate the numerical and structural changes of shape change arch rib rigidity under the modal, found arch rib rigidity of bridge structure change influence on the natural vibration characteristics of relatively large, the structural parameter under the vibration characteristics of only numerical change does not appear, modal shape change. (5) comparison at different speeds, the impact response of the bridge structure parameters of the vehicle bridge coupling, in consideration of the influences of the vehicle speed, the dynamic characteristics of beam bridge Were analyzed. To realize the influence of lattice beam variable parameters on the dynamic performance of the bridge is mainly through the parameter change on the structure's stiffness is found, and in the study of dynamic performance of bridge based on grillage method simplified the process, from the analysis of the various modes of the bridge, the structural modal parameters were optimized. The analysis of bridge structure bridge coupled dynamic performance by comparing the data for parameter optimization of grillage method simplified to provide basis.

【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U441

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