本文選題：連續(xù)剛構(gòu)橋　切入點(diǎn)：施工階段　出處：《長(zhǎng)沙理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來我國(guó)西南地區(qū)的地震活動(dòng)較為頻繁,連續(xù)剛構(gòu)橋在施工階段的地震響應(yīng)對(duì)橋梁成橋后全橋的地震響應(yīng)有著很大的影響,而在現(xiàn)有的施工工藝條件下,大跨度橋梁施工周期一般比較長(zhǎng),導(dǎo)致大跨度橋梁在施工中遇到地震的幾率增大,因此在施工過程中對(duì)大跨度橋梁的地震響應(yīng)分析很有必要,另外,近年來從地震對(duì)橋梁的破壞形式可以看出,由于橋梁施工過程中對(duì)樁—土效應(yīng)考慮不足,導(dǎo)致在地震發(fā)生時(shí),橋梁破壞普遍比較嚴(yán)重,現(xiàn)階段國(guó)內(nèi)外對(duì)大跨徑連續(xù)剛構(gòu)橋在施工階段的樁—土效應(yīng)對(duì)橋梁的抗震響應(yīng)分析研究較少,本文以四川赤水河大橋?yàn)槔?采用反應(yīng)譜分析法和動(dòng)態(tài)時(shí)程分析法對(duì)施工階段中最不利工況的地震響應(yīng)進(jìn)行了對(duì)比分析。本文主要內(nèi)容如下：(1)根據(jù)地震響應(yīng)分析理論的發(fā)展,對(duì)地震響應(yīng)分析理論進(jìn)行了總結(jié),通過橫向?qū)Ρ鹊姆绞?指出各個(gè)地震響應(yīng)分析理論的優(yōu)點(diǎn)與不足,并對(duì)各個(gè)方法的適應(yīng)范圍進(jìn)行了大概的描述,討論了影響施工階段地震響應(yīng)的主要幾個(gè)影響因素,為下文做準(zhǔn)備。(2)詳細(xì)的介紹了大跨度連續(xù)剛構(gòu)橋的動(dòng)力學(xué)特點(diǎn)及動(dòng)力學(xué)特性的分析方法,結(jié)合這些動(dòng)力學(xué)特性,利用MIDAS有限元軟件以四川赤水河大橋?qū)嵗?分別建立了考慮樁-土效應(yīng)和不考慮樁-土效應(yīng)的兩種有限元對(duì)比模型,并得到了在各個(gè)施工階段與全橋建成后的自振結(jié)果與動(dòng)力特性。(3)利用反應(yīng)譜分析法對(duì)大跨度連續(xù)剛構(gòu)橋的施工階段地震發(fā)生時(shí)的幾個(gè)不利階段進(jìn)行地震響應(yīng)分析,通過對(duì)兩種不同模型的計(jì)算結(jié)果可知,橋梁在考慮樁—土效應(yīng)時(shí),隨著施工的進(jìn)行,懸臂端各個(gè)方向上的位移幅值增大,根據(jù)不同地震激勵(lì)輸入方向的不同,墩底彎矩和剪力程增大趨勢(shì)。(4)利用動(dòng)力時(shí)程分析方法在對(duì)施工過程中相同的施工階段進(jìn)行地震時(shí)程響應(yīng)分析,在考慮結(jié)構(gòu)阻尼和樁-土效應(yīng)影響的情況下,對(duì)橋梁的兩種對(duì)比模型進(jìn)行計(jì)算分析,由其分析結(jié)果可知,在單一的地震激勵(lì)作用下,懸臂端各個(gè)響應(yīng)變化趨勢(shì)和反應(yīng)譜分析所得到的的結(jié)論大致相同,而在組合地震激勵(lì)下,墩底的彎矩和剪力響應(yīng)變化不一,但此時(shí)結(jié)構(gòu)各個(gè)響應(yīng)都達(dá)到了最大值,結(jié)構(gòu)處于抗震不利階段。
[Abstract]:The seismic response of continuous rigid frame bridge in the construction stage has a great influence on the seismic response of the whole bridge after the bridge is completed in recent years, but under the existing construction conditions, the seismic response of the bridge in southwest China is relatively frequent. The construction period of long-span bridges is generally long, which leads to the increase of the probability of earthquake encountered in the construction of long-span bridges. Therefore, it is necessary to analyze the seismic response of long-span bridges during construction. In recent years, it can be seen from the damage form of earthquake to bridge, because of the insufficient consideration of pile-soil effect in bridge construction, the bridge damage is generally serious when the earthquake occurs. At present, there is little research on the seismic response of long-span continuous rigid frame bridge under pile-soil effect in the construction stage at home and abroad. This paper takes Chishui River Bridge in Sichuan as an example. Response spectrum analysis and dynamic time history analysis are used to compare and analyze the seismic response of the most unfavorable working conditions in the construction stage. The main contents of this paper are as follows: 1) according to the development of the theory of seismic response analysis, This paper summarizes the theory of seismic response analysis, points out the advantages and disadvantages of each theory of seismic response analysis by means of horizontal comparison, and gives a general description of the applicability of each method. This paper discusses the main factors that affect the seismic response in the construction stage, and introduces in detail the dynamic characteristics of the long-span continuous rigid frame bridge and the analysis method of the dynamic characteristics, combining with these dynamic characteristics. By using the MIDAS finite element software, two finite element comparison models are established for considering pile-soil effect and not considering pile-soil effect respectively with the example of Chishui River Bridge in Sichuan Province. The natural vibration results and dynamic characteristics of each construction stage and the whole bridge are obtained. The response spectrum analysis method is used to analyze the seismic response of several unfavorable phases in the construction stage of the long-span continuous rigid frame bridge. Through the calculation results of two different models, it can be seen that with the construction of the bridge considering pile-soil effect, the amplitude of displacement in each direction of the cantilever end increases, according to the different input direction of different earthquake excitation. The dynamic time-history analysis method is used to analyze the seismic time-history response of the same construction stage in the construction process, considering the influence of structural damping and pile-soil effect. The two comparative models of the bridge are calculated and analyzed. The results show that under the action of single earthquake excitation, the variation trend of each response and the response spectrum analysis of the cantilever end are approximately the same, but under the combined earthquake excitation, the results are similar. The bending moment and shear response at the bottom of the pier vary greatly, but each response of the structure reaches the maximum at this time, and the structure is in the unfavorable stage of earthquake resistance.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U442.55;U448.23

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本文編號(hào)：1626194