連續(xù)梁橋車橋系統(tǒng)隨機地震響應(yīng)概率分布及動力可靠度研究
發(fā)布時間：2018-10-13 12:05
【摘要】：地震對橋梁工程的損害嚴重影響了人們的日常生活和災(zāi)后工作,又存在很大幾率威肋、著橋上列車的行車安全性。因此,進行地震響應(yīng)分析十分必要。地震動的三個基本振動特性為振幅大小、頻譜特性、持續(xù)時間,對地震反應(yīng)分析起著決定性作用,而三個特性均有顯著的隨機性,因此,將隨機振動理論應(yīng)用于橋梁地震分析是十分合理的。本文基于隨機振動理論,以某鐵路橋五跨連續(xù)梁橋為例,建立列車-軌道-橋梁耦合振動模型,采用團隊自主研發(fā)的列車-軌道-橋梁-地震分析程序(TTBSAS),研究了隨機地震荷載作用下隨機系統(tǒng)響應(yīng)的概率統(tǒng)計特性及動力可靠度。本文主要工作及成果如下：(1)考慮多點地震動的空間變化特性,即行波效應(yīng)、局部場地效應(yīng)、部分相干效應(yīng)、衰減效應(yīng),將Clough-Penzien譜作為自功率譜函數(shù),屈鐵軍-王君杰模型作為相干函數(shù),合成空間相關(guān)非平穩(wěn)地震波。并把自功率譜函數(shù)中的強度因子與濾波參數(shù)作為隨機參數(shù),采用乘同余法生成人工合成地震波樣本；(2)應(yīng)用Monte-Carlo模擬方法對人工合成的地震波樣本進行響應(yīng)概率統(tǒng)計分析。結(jié)果表明,車輛響應(yīng)與極值Ⅰ型分布吻合較好,包括車體加速度、脫軌系數(shù)、輪重減載率,橋梁跨中橫向位移響應(yīng)與極值Ⅰ型分布吻合較好,豎向位移和加速度響應(yīng)與對數(shù)正態(tài)分布吻合較好。列車行車速度和地震動行波效應(yīng)均對響應(yīng)的概率統(tǒng)計特性不產(chǎn)生影響；(3)根據(jù)響應(yīng)的概率統(tǒng)計特性曲線,得到橋梁跨中截面各響應(yīng)動力可靠度對應(yīng)的界限值和基于列車安全性準則的體系動力可靠度對應(yīng)的列車響應(yīng)界限值。結(jié)果表明,響應(yīng)界限值隨可靠度的增大而增大,按照傳統(tǒng)評價列車行車安全性和舒適性的指標,隨機地震荷載作用下滿足可靠度要求的前提不會影響行車安全性,但對舒適性有一定影響。
[Abstract]:The damage caused by earthquake to bridge engineering has seriously affected people's daily life and post-disaster work, and there is a great chance of the train safety on the bridge. Therefore, the seismic response analysis is very necessary. The three basic vibration characteristics of ground motion are amplitude, frequency spectrum and duration, which play a decisive role in seismic response analysis. It is very reasonable to apply random vibration theory to bridge seismic analysis. Based on the theory of random vibration and taking a five-span continuous beam bridge of a railway bridge as an example, a train-track bridge coupling vibration model is established in this paper. The probabilistic and statistical characteristics and dynamic reliability of stochastic system response under random earthquake loads are studied by using the Train-track Bridge-Seismic Analysis Program (TTBSAS),) developed by the team. The main work and results are as follows: (1) considering the spatial variation characteristics of multipoint ground motion, that is, traveling wave effect, local site effect, partial coherence effect and attenuation effect, the Clough-Penzien spectrum is taken as the self-power spectrum function. Qu Tiejun-Wang Junjie model is used as a coherent function to synthesize spatially correlated nonstationary seismic waves. The intensity factor and filter parameters in the self-power spectrum function are taken as random parameters and the synthetic seismic wave samples are generated by multiplicative congruence method. (2) the response probability statistical analysis of synthetic seismic wave samples is carried out by using Monte-Carlo simulation method. The results show that the vehicle response agrees well with the extreme type I distribution, including the acceleration of the car body, the derailment coefficient, the wheel load reduction rate, the lateral displacement response of the bridge in the middle of the span and the extreme value type I distribution. The vertical displacement and acceleration response agree well with the logarithmic normal distribution. Both the train speed and the traveling wave effect of ground motion have no effect on the probability and statistical characteristics of the response. (3) according to the probability and statistical characteristic curve of the response, The boundary values corresponding to the dynamic reliability of each response of the middle section of the bridge and the train response boundary value corresponding to the dynamic reliability of the system based on the train safety criterion are obtained. The results show that the response limit value increases with the increase of reliability. According to the traditional evaluation index of train running safety and comfort, the premise of meeting the reliability requirement under random earthquake load will not affect the driving safety. However, there is a certain impact on comfort.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U442.55
本文編號：2268555
[Abstract]:The damage caused by earthquake to bridge engineering has seriously affected people's daily life and post-disaster work, and there is a great chance of the train safety on the bridge. Therefore, the seismic response analysis is very necessary. The three basic vibration characteristics of ground motion are amplitude, frequency spectrum and duration, which play a decisive role in seismic response analysis. It is very reasonable to apply random vibration theory to bridge seismic analysis. Based on the theory of random vibration and taking a five-span continuous beam bridge of a railway bridge as an example, a train-track bridge coupling vibration model is established in this paper. The probabilistic and statistical characteristics and dynamic reliability of stochastic system response under random earthquake loads are studied by using the Train-track Bridge-Seismic Analysis Program (TTBSAS),) developed by the team. The main work and results are as follows: (1) considering the spatial variation characteristics of multipoint ground motion, that is, traveling wave effect, local site effect, partial coherence effect and attenuation effect, the Clough-Penzien spectrum is taken as the self-power spectrum function. Qu Tiejun-Wang Junjie model is used as a coherent function to synthesize spatially correlated nonstationary seismic waves. The intensity factor and filter parameters in the self-power spectrum function are taken as random parameters and the synthetic seismic wave samples are generated by multiplicative congruence method. (2) the response probability statistical analysis of synthetic seismic wave samples is carried out by using Monte-Carlo simulation method. The results show that the vehicle response agrees well with the extreme type I distribution, including the acceleration of the car body, the derailment coefficient, the wheel load reduction rate, the lateral displacement response of the bridge in the middle of the span and the extreme value type I distribution. The vertical displacement and acceleration response agree well with the logarithmic normal distribution. Both the train speed and the traveling wave effect of ground motion have no effect on the probability and statistical characteristics of the response. (3) according to the probability and statistical characteristic curve of the response, The boundary values corresponding to the dynamic reliability of each response of the middle section of the bridge and the train response boundary value corresponding to the dynamic reliability of the system based on the train safety criterion are obtained. The results show that the response limit value increases with the increase of reliability. According to the traditional evaluation index of train running safety and comfort, the premise of meeting the reliability requirement under random earthquake load will not affect the driving safety. However, there is a certain impact on comfort.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U442.55
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