【摘要】：由于地震發(fā)生難以預(yù)測,當(dāng)橋梁遭遇地震時(shí)橋上存在運(yùn)營車輛的情況較為常見。當(dāng)車輛過橋時(shí),由于車橋耦合關(guān)系,車橋系統(tǒng)下的地震響應(yīng)與單獨(dú)橋梁的地震響應(yīng)會(huì)存在一定的差異性。與直線梁橋相比,曲線梁橋的彎扭耦合效應(yīng)與空間動(dòng)力特性使得車輛作用對(duì)橋梁地震響應(yīng)的影響變得更加復(fù)雜。現(xiàn)行公路與城市橋梁抗震設(shè)計(jì)規(guī)范中,尚無關(guān)于曲線梁橋抗震設(shè)計(jì)中是否考慮車輛作用的相關(guān)規(guī)定。開展考慮車輛作用下的曲線梁橋地震動(dòng)力響應(yīng)特性研究,對(duì)于該類橋型的抗震設(shè)計(jì)與分析具有重要的理論意義與實(shí)用價(jià)值。為此,本文以曲線梁橋?yàn)閷?duì)象,開展了考慮車輛動(dòng)力作用及其關(guān)鍵參數(shù)影響的該類橋梁地震動(dòng)力行為特性研究。獲得的主要研究結(jié)果如下:首先,利用模態(tài)綜合法建立了曲線梁橋的車橋耦合動(dòng)力方程,基于MATLAB編寫了適用于曲線梁橋的車橋動(dòng)力分析程序。以一座曲線高墩鋼管混凝土桁架梁橋?yàn)槔?利用該橋的現(xiàn)場試驗(yàn)結(jié)果,對(duì)所編寫的分析程序進(jìn)行了驗(yàn)證。利用該程序,系統(tǒng)分析了車速、路面平整度、車輛數(shù)和車輛行駛位置等參數(shù)對(duì)該橋例的整體和局部沖擊效應(yīng)及行車舒適性的影響。結(jié)果表明現(xiàn)行規(guī)范大幅低估了該橋的車輛沖擊效應(yīng),其局部構(gòu)件的沖擊系數(shù)因位置不同差異較大;此外,該橋行車舒適性相對(duì)較差。然后,給出了人工地震波的生成方法,基于模態(tài)綜合法建立車輛-地震-橋梁相互作用動(dòng)力分析方程,并編寫了相應(yīng)的地震-車-橋動(dòng)力分析程序。以一座四跨混凝土曲線連續(xù)箱梁橋?yàn)槔?基于該橋縮尺模型地震振動(dòng)臺(tái)試驗(yàn)結(jié)果,對(duì)所建立的方法和動(dòng)力分析程序進(jìn)行了間接驗(yàn)證。結(jié)果表明所建立的車-地震-橋梁動(dòng)力分析方法和程序具有較高的分析精度和適用性,可用于后繼的考慮車輛作用下的橋梁地震動(dòng)力響應(yīng)分析研究。最后,以一座四跨混凝土曲線連續(xù)箱梁橋?yàn)槔?利用所編寫的動(dòng)力分析程序,分析了不同地震波及輸入角度條件下,車輛作用對(duì)橋梁地震動(dòng)力響應(yīng)的影響,并系統(tǒng)研究了車重、車速、地震動(dòng)峰值、場地條件和橋墩墩高等關(guān)鍵參數(shù)變化時(shí),車輛作用對(duì)曲線梁橋地震動(dòng)力反應(yīng)的影響特點(diǎn)和規(guī)律。研究結(jié)果表明:車輛作用對(duì)曲線梁橋地震反應(yīng)的影響顯著,抗震分析中應(yīng)考慮車輛作用的不利影響;考慮車輛作用的不利影響時(shí),應(yīng)將地震沿邊墩連線和邊墩垂線方向輸入;隨著車重和車速的提高,車輛作用對(duì)橋梁地震響應(yīng)的影響呈增大趨勢。此外,隨地震動(dòng)峰值提高,車輛作用的不利影響幅度會(huì)降低;特定場地條件下,車輛作用可產(chǎn)生對(duì)橋梁地震反應(yīng)有利的響應(yīng),且地震波頻率分布集中時(shí),車輛作用的影響較大;車輛作用對(duì)橋梁地震響應(yīng)的影響與橋墩高度的變化無明顯相關(guān)性,規(guī)律較為復(fù)雜。
[Abstract]:Because the earthquake is difficult to predict, when the bridge is hit by the earthquake, it is more common to have running vehicles on the bridge. When the vehicle crosses the bridge, there will be some difference between the seismic response of the vehicle-bridge system and that of the single bridge due to the coupling relationship between the vehicle-bridge system and the single bridge. Compared with the linear beam bridge, the bending-torsional coupling effect and the spatial dynamic characteristics of the curved beam bridge make the influence of the vehicle action on the seismic response of the bridge more complicated. In the current code for seismic design of highway and urban bridges, there is no relevant regulation on whether the action of vehicles should be taken into account in the seismic design of curved girder bridges. It is of great theoretical significance and practical value for the seismic design and analysis of curved beam bridges to carry out the research on the seismic response characteristics of curved girder bridges under the action of vehicles. Therefore, taking curved beam bridge as an object, the seismic dynamic behavior of this kind of bridge considering the dynamic action of vehicle and its key parameters is studied in this paper. The main research results are as follows: firstly, the vehicle-bridge coupling dynamic equation of curved beam bridge is established by means of modal synthesis method, and the dynamic analysis program for curved beam bridge is compiled based on MATLAB. Taking a curved high-pier concrete-filled steel tube truss girder bridge as an example, the analysis program is verified by using the field test results of the bridge. By using the program, the effects of vehicle speed, pavement smoothness, vehicle number and vehicle driving position on the overall and local impact effects and driving comfort of the bridge are systematically analyzed. The results show that the current code greatly underestimates the vehicle impact effect of the bridge, and the impact coefficient of the local components varies greatly due to the location of the bridge. In addition, the driving comfort of the bridge is relatively poor. Then, the generation method of artificial seismic wave is given. Based on the modal synthesis method, the dynamic analysis equation of vehicle-earthquake-bridge interaction is established, and the corresponding seismic-vehicle-bridge dynamic analysis program is compiled. Taking a four-span concrete curved continuous box girder bridge as an example, based on the seismic shaking table test results of the scale model of the bridge, the established method and dynamic analysis program are indirectly verified. The results show that the established method and program for vehicle-earthquake-bridge dynamic analysis are of high accuracy and applicability, and can be used to analyze the dynamic response of bridges under the action of vehicles. Finally, taking a four-span concrete curved continuous box girder bridge as an example, the influence of vehicle action on the seismic response of a four-span concrete continuous box girder bridge under different earthquake and input angles is analyzed by using the dynamic analysis program, and the vehicle weight is systematically studied. When the speed, the peak value of ground motion, the site conditions and the high key parameters of piers and piers are changed, the characteristics and rules of the influence of vehicle action on the seismic dynamic response of curved beam bridges are studied. The results show that the influence of vehicle on the seismic response of curved beam bridge is obvious, and the adverse effect of vehicle should be considered in seismic analysis, and when the adverse effect of vehicle action is considered, the earthquake should be inputted along the line of side pier and the vertical line of side pier. With the increase of vehicle weight and speed, the influence of vehicle action on the seismic response of bridges tends to increase. In addition, with the increase of the peak value of earthquake ground motion, the adverse effect amplitude of vehicle action will decrease, and the vehicle action can produce favorable response to the bridge seismic response under the condition of specific site, and the influence of vehicle action is greater when the frequency distribution of seismic wave is concentrated. There is no obvious correlation between the influence of vehicle action on the seismic response of bridge and the change of pier height, and the rule is more complicated.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U442.55

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本文編號(hào)：2433938