本文選題：連續(xù)剛構(gòu)彎橋 + 樁土效應(yīng)　； 參考：《長(zhǎng)沙理工大學(xué)》2014年碩士論文

【摘要】：我國是一個(gè)地震多發(fā)的國家,其中西部分布不少的地震帶,這些年隨著我國西部大開發(fā)的推進(jìn),交通建設(shè)是重中之重,勢(shì)必要建設(shè)很多橋梁。由于西部的山區(qū)地形特征,要建設(shè)許多彎橋,其中連續(xù)剛構(gòu)彎橋受到了工程師們的青睞,但是目前對(duì)這種橋型的動(dòng)力特性及其地震響應(yīng)特性的研究還比較少,本文就是基于這種背景對(duì)連續(xù)剛構(gòu)彎橋進(jìn)行抗震性能研究。論文以炎汝高速公路上的一座高墩連續(xù)剛構(gòu)彎橋?yàn)楣こ瘫尘?運(yùn)用Midas Civil有限元軟件建立數(shù)值計(jì)算模型,同時(shí)還模擬了樁土作用,應(yīng)用抗震基本理論在是否考慮樁土效應(yīng)工況下進(jìn)行了動(dòng)力特性分析、反應(yīng)譜分析和動(dòng)力時(shí)程分析。論文在運(yùn)用反應(yīng)譜法和時(shí)程分析法進(jìn)行地震響應(yīng)分析時(shí),結(jié)合連續(xù)剛構(gòu)彎橋的特點(diǎn),對(duì)比分析了不同曲率半徑的彎橋的反應(yīng)譜響應(yīng)和動(dòng)力時(shí)程響應(yīng),得出響應(yīng)結(jié)果隨曲率半徑變化的相關(guān)規(guī)律；改變激勵(lì)角度后用同樣方法進(jìn)行地震響應(yīng)分析,進(jìn)行不同激勵(lì)方向下的對(duì)比分析,找出橋梁的最不利激勵(lì)方向。論文還對(duì)連續(xù)剛構(gòu)彎橋進(jìn)行了結(jié)構(gòu)參數(shù)單因素分析,分別研究了不同墩高、單雙肢墩和不同的高跨比對(duì)連續(xù)剛構(gòu)彎橋的地震響應(yīng)影響。結(jié)果分析表明,橋梁的墩高對(duì)連續(xù)剛構(gòu)彎橋的動(dòng)力特性及地震響應(yīng)影響比較明顯,說明了墩高這個(gè)參數(shù)對(duì)連續(xù)剛構(gòu)彎橋的地震響應(yīng)影響比較大,這種影響是不能忽略的；單雙肢墩的選擇對(duì)連續(xù)剛構(gòu)彎橋的地震響應(yīng)影響也大,雙肢墩比單肢墩有著更小的整體剛度,采用雙肢墩可使結(jié)構(gòu)的頻率降低,可以有效地減小主梁的彎矩和響應(yīng)的位移,降低了墩底應(yīng)力；高跨比對(duì)連續(xù)剛構(gòu)彎橋的地震響應(yīng)影響不大,其計(jì)算的內(nèi)力(位移)結(jié)果增減都沒超過8%,可以不考慮該項(xiàng)參數(shù)對(duì)結(jié)構(gòu)地震響應(yīng)的影響。論文在最后對(duì)所做的研究工作進(jìn)行了歸納和總結(jié),提出了該研究方向的需要進(jìn)一步完善和解決的問題。
[Abstract]:China is an earthquake-prone country, and there are many seismic zones in the west of China. With the development of western China, traffic construction is the most important, and many bridges must be built.Because of the terrain characteristics of mountainous areas in the west, many curved bridges should be built, among which continuous rigid frame curved bridges are favored by engineers. But at present, there are few studies on the dynamic characteristics and seismic response characteristics of this type of bridge.Based on this background, the seismic behavior of continuous rigid frame curved bridge is studied in this paper.In this paper, a continuous rigid frame curved bridge with high piers on Yanru Expressway is used as the engineering background, a numerical model is established by using Midas Civil finite element software, and the effect of pile and soil is also simulated.The dynamic characteristic analysis, response spectrum analysis and dynamic time history analysis are carried out under the condition of whether the pile-soil effect is considered or not.In this paper, the response spectrum response and dynamic time-history response of curved bridge with different curvature radii are compared and analyzed by using response spectrum method and time-history analysis method, combined with the characteristics of continuous rigid frame bending bridge.The correlation law of response results with curvature radius is obtained. After changing the excitation angle, the seismic response analysis is carried out with the same method, and the most unfavorable excitation direction of the bridge is found out by comparing and analyzing the different excitation directions.The single factor analysis of structural parameters of continuous rigid frame curved bridge is also carried out, and the effects of different pier height, single pier and double pier and different ratio of height to span on seismic response of continuous rigid frame curved bridge are studied respectively.The results show that the pier height of the bridge has obvious influence on the dynamic characteristics and seismic response of the continuous rigid frame curved bridge, which indicates that the influence of the pier height on the seismic response of the continuous rigid frame curved bridge can not be ignored.The selection of single and double pier has a great influence on the seismic response of continuous rigid frame bending bridge. The double pier has smaller overall stiffness than the single pier. The frequency of the structure can be reduced by using the double pier, and the bending moment and response displacement of the main beam can be effectively reduced.The ratio of height to span has little effect on the seismic response of the continuous rigid frame bending bridge, and the calculated internal force (displacement) results do not exceed 8, so the influence of this parameter on the seismic response of the structure can be ignored.At the end of this paper, the research work is summarized and the problems that need to be further improved and solved are put forward.
【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)：1747606