【摘要】：近些年來(lái),在我國(guó)快速發(fā)展的經(jīng)濟(jì)建設(shè)中,新型橋梁結(jié)構(gòu)形式不斷地涌現(xiàn),同時(shí)也加快了城市橋梁的跨越式發(fā)展。怎樣保證橋梁在可能發(fā)生的地震作用下安全可靠地運(yùn)行,最大限度地避免人員傷亡,減輕震災(zāi)帶來(lái)的經(jīng)濟(jì)財(cái)產(chǎn)損失,且設(shè)計(jì)又不過(guò)于保守,成為工程界極其關(guān)注的問(wèn)題,這也對(duì)大跨度橋梁的抗震研究提出了許多新的課題�，F(xiàn)今,伴隨著橋梁設(shè)計(jì)方法的持續(xù)發(fā)展完善,按之前抗震方法設(shè)計(jì)的橋梁,大多存有不同程度的安全隱患。本文以廣西某大跨連續(xù)剛構(gòu)橋?yàn)楣こ瘫尘?針對(duì)大跨度橋梁抗震性能進(jìn)行了以下幾點(diǎn)的研究：1、綜述了大跨度橋梁的抗震設(shè)計(jì)理論、抗震研究的現(xiàn)狀以及存在的一些問(wèn)題。2、在簡(jiǎn)述地震響應(yīng)分析基本理論的同時(shí),對(duì)該橋建立了不同的下部結(jié)構(gòu)有限元計(jì)算模型,分析計(jì)算了該橋的動(dòng)力性能,求解得出此橋的自振頻率和振動(dòng)模態(tài),探討了樁土耦合效應(yīng)對(duì)橋梁結(jié)構(gòu)體系動(dòng)力特性的影響。3、在兩種模式的地震動(dòng)輸入下,采用兩種不同的有限元模型進(jìn)行反應(yīng)譜分析,計(jì)算橋梁結(jié)構(gòu)的地震響應(yīng),得出分離式承臺(tái)模型與整體式承臺(tái)模型相比,抗震性能更佳。再對(duì)其進(jìn)行一致激勵(lì)時(shí)程分析,并與反應(yīng)譜計(jì)算結(jié)果進(jìn)行對(duì)比。最后,對(duì)全文研究?jī)?nèi)容進(jìn)行了總結(jié),通過(guò)對(duì)不同模型的計(jì)算和分析比較,給出了一些結(jié)論與建議,并提出了需要進(jìn)一步研究的一些問(wèn)題。
[Abstract]:In recent years, in the rapid economic construction of our country, the new type of bridge structure is emerging constantly, and it also accelerates the leapfrog development of urban bridge. How to ensure the bridge to operate safely and reliably under the action of the possible earthquake, to avoid the casualties to the maximum extent, to reduce the economic property loss caused by the earthquake disaster, and the design is not too conservative, has become an extremely concerned problem in the engineering field. This also brings forward many new topics for the seismic research of long-span bridges. Nowadays, with the continuous development and perfection of the bridge design methods, most bridges designed according to the previous aseismic methods have different degrees of potential safety risks. Based on the engineering background of a long-span continuous rigid frame bridge in Guangxi, the seismic performance of long-span bridge is studied as follows: 1. The seismic design theory of long-span bridge is summarized. The present situation of seismic research and some existing problems. 2. The basic theory of seismic response analysis is briefly introduced, and different finite element calculation models of the substructure of the bridge are established, and the dynamic performance of the bridge is analyzed and calculated. The natural vibration frequency and vibration mode of the bridge are obtained, and the influence of pile-soil coupling effect on the dynamic characteristics of the bridge structure system is discussed. 3. Under the ground motion input of the two modes, two different finite element models are used to analyze the response spectrum. The seismic response of the bridge structure is calculated and the seismic performance of the separated cap model is better than that of the integral cap model. Then the consistent excitation time history analysis is carried out, and the results are compared with the results of response spectrum calculation. Finally, the research contents are summarized, and some conclusions and suggestions are given through the calculation and comparison of different models, and some problems that need further study 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)：2329917