本文選題：隨機(jī)車流 + 車-橋耦合��； 參考：《長安大學(xué)》2014年碩士論文

【摘要】：橋梁結(jié)構(gòu)的動力特性是評價(jià)橋梁設(shè)計(jì)參數(shù)是否合理的一個(gè)重要方面，沖擊系數(shù)是橋梁結(jié)構(gòu)動力特性的重要參數(shù)之一，本文基于隨機(jī)車流-橋梁耦合振動分析系統(tǒng)研究了不同車型車速變化時(shí)對沖擊系數(shù)的影響、典型車型以不同裝載量過橋?qū)蛄簺_擊系數(shù)的影響，以一座六跨連續(xù)T梁橋?yàn)閷ο笥?jì)算隨機(jī)車流作用下橋梁響應(yīng)和沖擊系數(shù)譜，，選擇高速公路五種典型跨徑簡支T梁橋研究特重車流作用下沖擊系數(shù)譜、并引入路面粗糙度修正系數(shù)提出橋梁沖擊系數(shù)合理取值的計(jì)算方法。主要研究內(nèi)容如下： 1．根據(jù)采集到的24小時(shí)隨機(jī)車流數(shù)據(jù)將高速公路常見車型劃分為17種，對車型、車速、車重及橫向行駛位置等參數(shù)進(jìn)行統(tǒng)計(jì)分析，以一座六跨連續(xù)T梁為工程背景計(jì)算隨機(jī)車流下橋梁靜動力響應(yīng)，形成沖擊系數(shù)譜，分析沖擊系數(shù)譜的分布規(guī)律及其與車速、車重、主梁內(nèi)力之間的關(guān)系。 2．研究了不同車型以不同行車速度通過橋梁時(shí)沖擊系數(shù)的變化規(guī)律，并選擇對橋梁沖擊系數(shù)影響較大的幾種典型車型，建立不同載重量的行車工況，研究典型車型不同車重作用對橋梁沖擊系數(shù)的影響。 3．選擇高速公路五種典型跨徑簡支T梁橋，建立了特重車流樣本，計(jì)算特重車流作用下不同跨徑橋梁靜動力響應(yīng)，形成特重車流橋梁沖擊系數(shù)譜，研究橋梁沖擊系數(shù)譜與車輛荷載靜力效應(yīng)的關(guān)系并引入設(shè)計(jì)荷載效應(yīng)作為對比，對沖擊系數(shù)譜進(jìn)行優(yōu)度擬合檢驗(yàn)，計(jì)算在置信度95%水平下橋梁沖擊系數(shù)取值，研究沖擊系數(shù)取值與橋梁跨徑、橋梁基頻之間的關(guān)系，最后考慮路面粗糙度影響提出橋梁沖擊系數(shù)的合理取值方法。
[Abstract]:The dynamic characteristics of bridge structure is an important aspect to evaluate whether the design parameters of bridge are reasonable or not, and the impact coefficient is one of the important parameters of dynamic characteristics of bridge structure. Based on the random vehicle-bridge coupling vibration analysis system, this paper studies the influence of different vehicle speed on the impact coefficient, and the influence of the bridge crossing with different loading capacity on the bridge impact coefficient. Taking a six-span continuous T-beam bridge as an object to calculate the response and impact coefficient spectrum of the bridge under the action of random traffic flow, five typical span simply supported T-beam bridges are selected to study the impact coefficient spectrum under the action of extra heavy vehicle flow. A reasonable calculation method of bridge impact coefficient is put forward by introducing road roughness correction coefficient. The main research contents are as follows: 1. According to the data of 24 hours random traffic flow, the common vehicles are divided into 17 types, and the parameters such as vehicle type, speed, vehicle weight and lateral driving position are statistically analyzed. The static and dynamic responses of a six-span continuous T-beam under random traffic flow are calculated to form the shock coefficient spectrum. The distribution law of the impact coefficient spectrum and its relationship with vehicle speed and vehicle weight are analyzed. 2. Study the change rule of impact coefficient when different vehicle type passes through bridge with different driving speed, and select several typical models which have great influence on bridge impact coefficient. The influence of different vehicle weight on the impact coefficient of the bridge was studied. 3. Five typical span simply supported T-beam bridges were selected and the special weight vehicle flow samples were established. The static and dynamic responses of bridges with different spans under the action of extra heavy vehicle flow are calculated to form the impact coefficient spectrum of super heavy vehicle flow bridges. The relationship between the impact coefficient spectrum of the bridge and the static effect of vehicle load is studied and the design load effect is introduced as a comparison. The impact coefficient spectrum is tested by goodness fitting, and the bridge impact coefficient is calculated at 95% confidence level, and the relationship between the impact coefficient value and bridge span and bridge fundamental frequency is studied. Finally, considering the influence of road roughness, a reasonable method of bridge impact coefficient is put forward.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.3

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