【摘要】：隨著我國(guó)橋梁事業(yè)的迅速發(fā)展,車流量、行車速度和載荷的提高,決定了需要不斷提高橋梁結(jié)構(gòu)的設(shè)計(jì)要求,而沖擊效應(yīng)作為一個(gè)主要的指標(biāo)來(lái)評(píng)價(jià)橋梁結(jié)構(gòu)的行車性能和橋面平整度,越來(lái)越受到研究者的關(guān)注。我國(guó)04規(guī)范中規(guī)定了沖擊系數(shù)的規(guī)范計(jì)算方法,特別說(shuō)明了連續(xù)梁橋支點(diǎn)負(fù)彎矩截面的沖擊系數(shù)計(jì)算不應(yīng)用基頻進(jìn)行計(jì)算,基于規(guī)范這一說(shuō)明,本文通過(guò)收集的常規(guī)連續(xù)梁橋和拱橋試驗(yàn)樣本,根據(jù)數(shù)值計(jì)算模擬和試驗(yàn)樣本統(tǒng)計(jì)分析的方法,分別對(duì)連續(xù)梁橋邊跨最大正彎矩截面及中支點(diǎn)負(fù)彎矩截面、拱橋的L/4截面及跨中截面的沖擊系數(shù)或應(yīng)變?cè)龃笙禂?shù)及結(jié)構(gòu)頻率進(jìn)行統(tǒng)計(jì)分析,擬合并分析上述測(cè)試截面的沖擊系數(shù)或應(yīng)變?cè)龃笙禂?shù)與結(jié)構(gòu)頻率間的數(shù)學(xué)模型關(guān)系曲線,得出兩者間較合適的關(guān)系曲線,并按照沖擊效應(yīng)規(guī)范取值的意義和95%的保證率進(jìn)行修正得到估算公式。利用ABAQUS有限元軟件分別建立平昌縣星光工業(yè)園區(qū)基礎(chǔ)建設(shè)工程2×30m預(yù)應(yīng)力混凝土小箱梁橋和巴河大橋的分析模型,分析得出兩橋的自振頻率理論值并將其與實(shí)測(cè)值進(jìn)行對(duì)比分析,同時(shí)結(jié)合靜載試驗(yàn)分別驗(yàn)證上述兩座橋梁的實(shí)際剛度;根據(jù)試驗(yàn)車速分別對(duì)兩橋施加試驗(yàn)車輛荷載建立車橋耦合模型,計(jì)算得到不同車速下兩橋測(cè)試截面的理論沖擊系數(shù)或應(yīng)變?cè)龃笙禂?shù),并分別按照車速將理論計(jì)算值、實(shí)測(cè)值、規(guī)范取值及估算公式取值進(jìn)行對(duì)比分析,分別驗(yàn)證上述橋梁估算公式的合理性并評(píng)價(jià)其結(jié)構(gòu)的安全性能。
[Abstract]:With the rapid development of bridge industry in China, the increasing of traffic flow, driving speed and load determines the need to continuously improve the design requirements of bridge structure. The impact effect, as a main index to evaluate the driving performance and deck smoothness of bridge structure, has been paid more and more attention by researchers. The calculation method of impact coefficient is specified in Code 04 of our country. It is especially explained that the calculation of impact coefficient of negative moment section at fulcrum of continuous beam bridge is not calculated by fundamental frequency, based on this specification, According to the method of numerical simulation and statistical analysis of test samples of conventional continuous beam bridges and arch bridges, the maximum positive moment section and the negative moment section of the middle fulcrum of the bridge side of the continuous beam bridge are respectively studied in this paper. The impact coefficient or strain increase coefficient and structural frequency of the L- / 4 section and the mid-span section of the arch bridge are statistically analyzed, and the mathematical model curves between the impact coefficient or strain increase coefficient of the above test section and the frequency of the structure are analyzed together. A more suitable relationship curve between the two is obtained, and the estimation formula is obtained according to the significance of the criterion of impact effect and the 95% guarantee rate. The analysis models of the 2 脳 30m prestressed concrete small box girder bridge and the Bahe Bridge are established by using the ABAQUS finite element software, respectively. The theoretical values of the natural vibration frequencies of the two bridges are obtained and compared with the measured values. At the same time, the actual stiffness of the above two bridges is verified by static load test. The vehicle-bridge coupling model is established according to the vehicle load applied to the two bridges by the test speed, and the theoretical impact coefficient or strain increase coefficient of the two bridge test sections under different speeds are calculated, and the theoretical values are calculated according to the speed of the two bridges, and the measured values are measured. The rationality of the bridge estimation formula is verified and the safety performance of the bridge structure is evaluated by comparing and analyzing the standard values and the estimation formula values.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前4條

1 姜維成;于立新;;基于阻尼對(duì)連續(xù)梁橋沖擊系數(shù)影響的研究[J];吉林建筑工程學(xué)院學(xué)報(bào);2007年03期

2 王少欽,岳祖潤(rùn),馬殠;車輛對(duì)橋梁動(dòng)力作用簡(jiǎn)化方法的研究[J];石家莊鐵道學(xué)院學(xué)報(bào);2005年03期

3 譚國(guó)輝;橋梁與車輛相互作用的系統(tǒng)模擬[J];土木工程學(xué)報(bào);1996年03期

4 宋一凡,賀拴海;公路橋梁沖擊系數(shù)的影響因素分析[J];西安公路交通大學(xué)學(xué)報(bào);2001年02期

相關(guān)碩士學(xué)位論文 前1條

1 趙劍;梁式橋汽車沖擊振動(dòng)研究與分析[D];重慶交通大學(xué);2009年

，

本文編號(hào)：2403662