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

【摘要】：我國處于兩大地震帶之間,是個震害較為嚴重的國家。近年來,波形鋼腹板PC組合箱梁結構在橋梁工程中的應用愈來愈廣泛,了解其結構動力特性及在地震作用下的反應有著十分重要的意義。作為一種快速簡便的地震響應分析方法,Pushover(靜力彈塑性)分析成為目前抗震研究的熱點。本文以一座波形鋼腹板PC連續(xù)剛構橋為背景,研究了Pushover分析法在橋梁結構地震響應分析中的應用。從橋墩構件到全橋結構,對這種分析方法的應用進行了詳細的闡述。系統(tǒng)地總結了Pushover分析法的基本原理、基本假定及實現(xiàn)過程。指出了影響分析結果的兩大重要因素：側向力分布模式的選取和目標位移的計算方法。并詳細介紹了用能力譜法評估結構抗震性能的關鍵步驟。對薄壁箱形墩模型,選取兩種側向力分布模式(均勻分布模式和基本振型分布模式)進行Pushover分析。結果表明順橋向和橫橋向的結構能力曲線(墩底剪力-墩頂位移關系曲線)變化規(guī)律基本一致；同一結構在不同的側向荷載分布模式下結構能力曲線有所差異。根據(jù)求得的性能點的位置評估了薄壁箱形墩結構的抗震性能。對其進行反應譜分析,并將結果與Pushover分析作對比。結果顯示兩種分析方法下的結構地震響應基本一致,說明Pushover分析方法適用于該結構并且簡便高效。采用Ritz向量分析法對一座波形鋼腹板PC連續(xù)剛構橋進行結構動力特性分析,以兩種工況(工況一：主要振型確定的側向荷載+自重+二期恒載；工況二：前70階振型確定的側向荷載+自重+二期恒載)分別就順橋向和橫橋向進行全橋結構Pushover分析。結果表明,在這兩種不同工況下結構的能力曲線基本一致,由性能點表征的結構地震響應也基本吻合。說明采用振型貢獻率較高的主要振型來確定側向荷載分布模式是可行的,在評價橋梁結構的抗震性能方面可以達到選取較多階振型進行分析的效果。介紹了非線性動力時程分析法及選波方法,并求得全橋結構地震響應。各墩墩頂位移響應與Pushover分析結果的對比表明,Pushover分析結果與時程分析結果較為接近,并且略有偏大。說明了對于課題背景橋,基于Pushover分析的結構抗震性能評估偏于安全。
[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.
【學位授予單位】：東南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441.3;U448.23

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