山區(qū)混凝土梁橋延性抗震性能評估
發(fā)布時間:2018-03-04 12:11
本文選題:橋梁工程 切入點:延性 出處:《長安大學》2014年碩士論文 論文類型:學位論文
【摘要】:山區(qū)混凝土梁橋作為一種最常采用的結構形式,在我國橋梁工程中占有重要作用。其在地震災害發(fā)生后的破壞程度將直接影響到道路的順暢以及災后的重建工作。因此,準確評估山區(qū)混凝土梁橋的延性能力,定性的對山區(qū)梁橋的抗震性能有個全面的認識和把握,對于保證橋梁結構在地震作用后的安全性具有重要意義。鑒于此,本文在對山區(qū)混凝土橋梁進行充分調研的基礎上,對山區(qū)混凝土梁橋的延性抗震性能做了以下幾個方面的工作: (1)根據相關文獻資料調查,介紹了橋梁延性抗震設計的方法,歸納總結了基于性能設計的Pushover分析方法的適應性及主要應用研究成果。 (2)根據既有橋梁的設計資料,應用有限元程序SAP2000截面分析模塊,,對不同跨徑、不同截面形式以及不同設計參數下,山區(qū)混凝土梁橋墩柱截面的彎矩-曲率關系進行計算與分析,得到不同設計參數下墩柱的彎矩-曲率曲線,計算其延性系數。通過對截面不同設計參數的分析,研究了鋼筋的配置對橋墩延性能力的影響。 (3)在結合Pushover分析方法的概念、原理以及實現方法的基礎上,給出了一種基于Pushover分析的橋梁延性抗震能力評估方法。介紹了該方法中地震損傷模型的選擇、損傷指數的確定以及具體的實施步驟。 (4)結合山區(qū)混凝土梁橋的特點,結合實際橋梁結構,根據前述理論進行分析,對其延性抗震能力進行評估。
[Abstract]:As one of the most commonly used structural forms, concrete beam bridges in mountainous areas play an important role in bridge engineering in China. The damage degree of concrete beam bridges after earthquake disaster will directly affect the smooth road and reconstruction work after the disaster. It is of great significance to evaluate the ductility of concrete beam bridges in mountainous areas accurately and qualitatively to understand and grasp the seismic behavior of girder bridges in mountainous areas, which is of great significance to ensure the safety of bridge structures after earthquake. Based on the investigation of concrete bridges in mountainous areas, the ductile seismic behavior of concrete beam bridges in mountainous areas is studied in this paper as follows:. 1) based on the investigation of relevant literature, this paper introduces the methods of ductile seismic design of bridges, and summarizes the adaptability and main application research results of Pushover analysis method based on performance design. According to the design data of existing bridges and using the finite element program SAP2000 section analysis module, this paper calculates and analyzes the moment curvature relation of the section of concrete bridge pier and column in mountainous area under different span, different section form and different design parameters. The moment curvature curve of pier column under different design parameters is obtained and its ductility coefficient is calculated. The influence of reinforcement configuration on ductility capacity of pier is studied by analyzing different design parameters of section. On the basis of the concept, principle and implementation of Pushover analysis method, a method for evaluating the ductility seismic capacity of bridges based on Pushover analysis is presented. The selection of seismic damage model in this method is introduced. The determination of damage index and the specific implementation steps. Combined with the characteristics of concrete beam bridge in mountainous area and the actual bridge structure, the ductile seismic capacity of the bridge is evaluated according to the theory mentioned above.
【學位授予單位】:長安大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:U442.55;U448.33
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