【摘要】：地震是一種嚴(yán)重的自然災(zāi)害,對(duì)于鐵路系統(tǒng)而言,地震可能會(huì)引起軌道彎曲、車輛脫軌、橋梁坍塌等一系列問(wèn)題。隨著高速鐵路的發(fā)展,橋梁在鐵路線路中所占的比例不斷增大,地震發(fā)生時(shí)車輛運(yùn)行在橋梁上的概率也隨之變大。為了探究地震對(duì)車輛和橋梁的影響,建立了車輛-橋梁空間耦合系統(tǒng)動(dòng)力學(xué)分析模型,其中車輛模擬為多剛體系統(tǒng),采用達(dá)朗貝爾原理推導(dǎo)車輛系統(tǒng)動(dòng)力學(xué)方程;橋梁假定為質(zhì)量均勻分布的等截面簡(jiǎn)支梁,采用模態(tài)坐標(biāo)法建立橋梁廣義坐標(biāo)方程。將規(guī)格化的地震波作為系統(tǒng)激勵(lì),同時(shí)考慮軌道隨機(jī)不平順的影響,采用新型顯式積分法求解系統(tǒng)方程,分析不同烈度地震作用下車橋耦合系統(tǒng)的動(dòng)力響應(yīng)。結(jié)果表明,地震作用車輛-橋梁空間耦合系統(tǒng)的響應(yīng)有著顯著的影響。當(dāng)?shù)卣鹆叶仍跇蛄旱目拐鹪O(shè)防烈度范圍內(nèi)時(shí),橋梁垂向加速度、橫向加速度、垂向撓度和橫向撓度均滿足規(guī)范的限值要求。車輛運(yùn)行平穩(wěn)性的Sperling指標(biāo)相對(duì)加速度指標(biāo)較為寬松,當(dāng)?shù)卣鹆叶葹?度及以上時(shí),車輛已不能平穩(wěn)地運(yùn)行于橋梁之上。車輛的脫軌系數(shù)隨著行駛速度的增加急劇增大,當(dāng)?shù)卣鸢l(fā)生時(shí),需要采取制動(dòng)措施避免安全事故的發(fā)生。軌道隨機(jī)不平順對(duì)車輛動(dòng)力響應(yīng)的影響不明顯,對(duì)橋梁垂向加速度響應(yīng)影響相對(duì)明顯。在相對(duì)較弱的地震作用下,如需詳細(xì)研究橋梁的動(dòng)力響應(yīng),則不應(yīng)該忽略軌道隨機(jī)不平順的影響。隨著地震烈度的增大,軌道隨機(jī)不平順的影響越來(lái)越小。
[Abstract]:Earthquake is a serious natural disaster, for railway system, earthquake may cause a series of problems, such as track bending, vehicle derailment, bridge collapse and so on. With the development of high-speed railway, the proportion of bridges in railway lines is increasing, and the probability of vehicles running on bridges becomes larger when earthquake occurs. In order to investigate the effect of earthquake on vehicle and bridge, the dynamic analysis model of vehicle-bridge spatial coupling system is established. The vehicle simulation is a multi-rigid body system, and the dynamic equation of vehicle system is derived by using the Darembert principle. The bridge is assumed to be a simple supported beam with uniform mass distribution. The generalized coordinate equation of the bridge is established by using the modal coordinate method. Taking the normalized seismic wave as the system excitation and considering the influence of track random irregularity, a new explicit integral method is used to solve the system equation, and the dynamic response of the vehicle-bridge coupling system under different intensity earthquakes is analyzed. The results show that the seismic response of vehicle-bridge spatial coupling system is significant. When the seismic intensity is within the range of seismic fortification intensity of the bridge, the vertical acceleration, transverse acceleration, vertical deflection and transverse deflection of the bridge all meet the limit requirements of the code. The Sperling index of vehicle running stability is relatively loose relative to acceleration index. When the seismic intensity is 7 degrees or above, the vehicle can no longer run smoothly on the bridge. The derailment coefficient of the vehicle increases sharply with the increase of the driving speed. When the earthquake occurs, the braking measures should be taken to avoid the occurrence of the safety accident. The influence of track random irregularity on vehicle dynamic response is not obvious, but on the vertical acceleration response of bridge is relatively obvious. If the dynamic response of the bridge needs to be studied in detail under the relatively weak earthquake, the influence of track random irregularity should not be ignored. With the increase of seismic intensity, the influence of track random irregularity becomes smaller and smaller.
【學(xué)位授予單位】：蘇州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U442.55;U211.9

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本文編號(hào)：2274105