本文選題：橋梁抗震　切入點(diǎn)：波形鋼腹板　出處：《東南大學(xué)》2015年碩士論文

【摘要】：我國處于兩大地震帶之間,是個(gè)震害較為嚴(yán)重的國家。近年來,波形鋼腹板PC組合箱梁結(jié)構(gòu)在橋梁工程中的應(yīng)用愈來愈廣泛,了解其結(jié)構(gòu)動(dòng)力特性及在地震作用下的反應(yīng)有著十分重要的意義。作為一種快速簡便的地震響應(yīng)分析方法,Pushover(靜力彈塑性)分析成為目前抗震研究的熱點(diǎn)。本文以一座波形鋼腹板PC連續(xù)剛構(gòu)橋?yàn)楸尘?研究了Pushover分析法在橋梁結(jié)構(gòu)地震響應(yīng)分析中的應(yīng)用。從橋墩構(gòu)件到全橋結(jié)構(gòu),對(duì)這種分析方法的應(yīng)用進(jìn)行了詳細(xì)的闡述。系統(tǒng)地總結(jié)了Pushover分析法的基本原理、基本假定及實(shí)現(xiàn)過程。指出了影響分析結(jié)果的兩大重要因素：側(cè)向力分布模式的選取和目標(biāo)位移的計(jì)算方法。并詳細(xì)介紹了用能力譜法評(píng)估結(jié)構(gòu)抗震性能的關(guān)鍵步驟。對(duì)薄壁箱形墩模型,選取兩種側(cè)向力分布模式(均勻分布模式和基本振型分布模式)進(jìn)行Pushover分析。結(jié)果表明順橋向和橫橋向的結(jié)構(gòu)能力曲線(墩底剪力-墩頂位移關(guān)系曲線)變化規(guī)律基本一致；同一結(jié)構(gòu)在不同的側(cè)向荷載分布模式下結(jié)構(gòu)能力曲線有所差異。根據(jù)求得的性能點(diǎn)的位置評(píng)估了薄壁箱形墩結(jié)構(gòu)的抗震性能。對(duì)其進(jìn)行反應(yīng)譜分析,并將結(jié)果與Pushover分析作對(duì)比。結(jié)果顯示兩種分析方法下的結(jié)構(gòu)地震響應(yīng)基本一致,說明Pushover分析方法適用于該結(jié)構(gòu)并且簡便高效。采用Ritz向量分析法對(duì)一座波形鋼腹板PC連續(xù)剛構(gòu)橋進(jìn)行結(jié)構(gòu)動(dòng)力特性分析,以兩種工況(工況一：主要振型確定的側(cè)向荷載+自重+二期恒載；工況二：前70階振型確定的側(cè)向荷載+自重+二期恒載)分別就順橋向和橫橋向進(jìn)行全橋結(jié)構(gòu)Pushover分析。結(jié)果表明,在這兩種不同工況下結(jié)構(gòu)的能力曲線基本一致,由性能點(diǎn)表征的結(jié)構(gòu)地震響應(yīng)也基本吻合。說明采用振型貢獻(xiàn)率較高的主要振型來確定側(cè)向荷載分布模式是可行的,在評(píng)價(jià)橋梁結(jié)構(gòu)的抗震性能方面可以達(dá)到選取較多階振型進(jìn)行分析的效果。介紹了非線性動(dòng)力時(shí)程分析法及選波方法,并求得全橋結(jié)構(gòu)地震響應(yīng)。各墩墩頂位移響應(yīng)與Pushover分析結(jié)果的對(duì)比表明,Pushover分析結(jié)果與時(shí)程分析結(jié)果較為接近,并且略有偏大。說明了對(duì)于課題背景橋,基于Pushover分析的結(jié)構(gòu)抗震性能評(píng)估偏于安全。
[Abstract]:China lies between the two major seismic zones and is a country with severe earthquake damage.In recent years, the application of corrugated steel web PC composite box girder structure in bridge engineering is more and more extensive. It is of great significance to understand the dynamic characteristics of the structure and its response to earthquake.As a fast and simple method for seismic response analysis, Pushovere (static elastoplastic) analysis has become a hot topic in seismic research.Based on a PC continuous rigid frame bridge with corrugated steel web, the application of Pushover analysis method to the seismic response analysis of bridge structure is studied in this paper.The application of this analysis method is described in detail from pier member to whole bridge structure.The basic principle, basic assumption and realization process of Pushover analysis are summarized systematically.Two important factors affecting the analysis results are pointed out: the selection of lateral force distribution model and the calculation method of target displacement.The key steps to evaluate the seismic performance of structures by capacity spectrum method are introduced in detail.For thin-walled box pier model, two kinds of lateral force distribution modes (uniform distribution mode and basic mode distribution mode) are selected for Pushover analysis.The results show that the variation law of the structural capacity curve (the shear-pier top displacement relation curve) is basically the same, and the structural capacity curve of the same structure is different under different lateral load distribution modes.The seismic performance of thin-walled box pier structure is evaluated according to the location of the obtained performance point.The reaction spectrum was analyzed and the results were compared with Pushover analysis.The results show that the seismic response of the structure under the two methods is basically the same, which indicates that the Pushover analysis method is suitable for the structure and is simple and efficient.The structural dynamic characteristics of a corrugated steel web PC continuous rigid frame bridge were analyzed by Ritz vector analysis method.Case two: the first 70 modes determined by lateral load dead load for the second phase) the whole bridge structure Pushover analysis is carried out on the straight bridge direction and the transverse bridge direction respectively.The results show that the capacity curves of the structures under these two different working conditions are basically the same, and the seismic responses of the structures characterized by the performance points are basically consistent.It is proved that it is feasible to determine the lateral load distribution mode by using the main modes with higher contribution rate of vibration modes, and the seismic behavior of bridge structures can be evaluated by selecting more than one vibration mode for analysis.The nonlinear dynamic time-history analysis method and wave selection method are introduced, and the seismic response of the whole bridge structure is obtained.The comparison of displacement response of pier top with that of Pushover analysis shows that the results of pushover analysis are close to those of time-history analysis and are slightly larger.It shows that the seismic performance evaluation of the structure based on Pushover analysis is more safe than that of the background bridge.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441.3;U448.23

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王廣軍;層狀土地震反應(yīng)分析中的輸入波[J];巖土工程學(xué)報(bào);1984年03期

2 王志良;沈智剛;李相崧;黃賓;;用計(jì)算機(jī)聯(lián)機(jī)實(shí)驗(yàn)系統(tǒng)進(jìn)行土層地震反應(yīng)分析[J];世界地震工程;1986年04期

3 K·Kawano;K·Nagamitsu;伍國，

本文編號(hào)：1727782