本文選題：隨機車輛荷載 + CA模型��； 參考：《江西理工大學(xué)》2017年碩士論文

【摘要】：在全國經(jīng)濟飛速增長的環(huán)境下,工業(yè)化發(fā)展程度的不同致使各地運輸行業(yè)存在顯著區(qū)別。工業(yè)化程度較高的地區(qū),其運輸荷載較大,則可能會導(dǎo)致橋梁承受的荷載大于規(guī)范設(shè)計值。因此本文結(jié)合國家自然基金(編號:51278134)、江西省交通運輸廳科技項目(編號:2014Y0012)及江西省教育廳項目(編號:2016GJJ160620)的研究,通過對兩個工業(yè)化程度明顯不同的粵贛地區(qū)某段高速公路實測車輛荷載數(shù)據(jù)進行分析,研究的主要內(nèi)容如下:(1)基于工業(yè)發(fā)達程度不同的粵贛兩地實測車輛荷載數(shù)據(jù),對其進行統(tǒng)計分析得出各個車型所占比例以及各車型車重概率分布,根據(jù)實測數(shù)據(jù)建立了基于CA理論的模型。利用實測車輛荷載信息,在MATLAB程序環(huán)境下編制了涵蓋車輛速度、重量、換道以及車型等參數(shù)的CA仿真模擬程序,在仿真模擬過程中發(fā)現(xiàn)出現(xiàn)較多超載車輛的廣韶高速路面在同等運行狀態(tài)下,路面總荷載大于贛定高速模擬結(jié)果,且廣韶行車道與超車道荷載分布不均。(2)對目前現(xiàn)有的車致振動理論對比分析,計算了不同模型荷載作用在簡支梁上引起的跨中位移,模擬結(jié)果顯示,集中力和移動質(zhì)量作用結(jié)果十分接近,而加入彈簧的移動質(zhì)量模型則可以起到減振的作用,且在一定剛度范圍內(nèi),剛度越小減振效果越明顯。并提出了將CA仿真模擬程序產(chǎn)生的隨機荷載應(yīng)用到ANSYS模型下橋梁之上的實現(xiàn)方案。(3)以幾種典型的連續(xù)剛構(gòu)橋為例,利用本文提出的車致振動方法進行分析得到,隨機荷載作用下橋梁跨中位移沖擊系數(shù)較為接近規(guī)范沖擊系數(shù);貨車擁堵運行狀態(tài)下相比較于其他幾種運行狀態(tài),有較大概率使橋梁產(chǎn)生較大跨中位移;限載對公路橋梁起到了極大的保護作用,橋梁跨中限載后產(chǎn)生的位移均值只有限載前的1/2;橋梁的抗彎剛度增加并不會迅速降低由隨機荷載對橋面沖擊造成的跨中位移值大小,但是降低橋梁抗彎剛度會使橋梁在隨機荷載作用下的跨中位移值迅速增大;在增加TMD減振措施下,橋梁減振效果明顯,在一定阻尼比范圍內(nèi),隨著阻尼比的加大,減振效果逐步加強。
[Abstract]:In the environment of rapid economic growth, the different degree of industrialization leads to significant differences in transportation industry. In the areas with high industrialization, the load of the bridge may be larger than the design value of the code. Therefore, this paper combines the research of the National Natural Fund (No.: 51278134N), the Science and Technology Project of Jiangxi Provincial Traffic and Transport Department (No.: 2014Y0012) and the Project of Jiangxi Provincial Education Department (No.: 2016GJJ160620). Based on the analysis of the measured vehicle load data of two expressway sections in Guangdong and Jiangxi provinces with different industrialization, the main contents of the study are as follows: (1) based on the measured vehicle load data of Guangdong and Jiangxi provinces with different degree of industrial development, The proportion of each vehicle type and the probability distribution of vehicle weight are obtained by statistical analysis, and the model based on CA theory is established according to the measured data. Based on the measured vehicle load information, a CA simulation program covering the parameters of vehicle speed, weight, change of track and vehicle type is developed under the environment of MATLAB program. In the course of simulation, it is found that the total load of Guangshao high speed pavement with more overloaded vehicles is larger than that of Ganding high-speed road under the same running condition. Moreover, the load distribution of Guangshao carriageway and overtaking track is uneven. Compared with the existing vehicle-induced vibration theory, the mid-span displacement caused by different model loads on simply supported beams is calculated. The simulation results show that, The results of concentrated force and moving mass are very close, but the moving mass model with spring can reduce vibration, and the smaller the stiffness is, the more obvious the damping effect is. The realization scheme of applying the random load generated by the CA simulation program to the bridge under the ANSYS model is put forward. Taking several typical continuous rigid frame bridges as an example, the vehicle induced vibration method proposed in this paper is used to obtain the results. The impact coefficient of mid-span displacement of bridge under random load is close to the standard impact coefficient, compared with the other running states, there is a greater probability that the bridge will produce larger mid-span displacement under the condition of truck congestion. The limited load has a great protective effect on the highway bridge. The average displacement produced by the bridge span after the mid-load limit is only 1 / 2 of that before the limited load, and the increase of the flexural stiffness of the bridge will not rapidly reduce the magnitude of the mid-span displacement caused by the impact of random loads on the bridge deck. However, reducing the flexural stiffness of the bridge will make the displacement of the bridge under random load increase rapidly. With the increase of TMD, the damping effect of the bridge is obvious, and in a certain range of damping ratio, the damping ratio increases with the increase of the damping ratio. The damping effect is gradually strengthened.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U441.3

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