發(fā)布時間：2019-06-18 17:48

【摘要】：橋梁的抗震設計包括兩方面,一方面是具體的參數(shù)設計,這種方法側重于計算分析;另一種是抗震概念設計,是設計工作者通過對震害的認識和總結,在抗震設計前期,做出合理的分析和判斷,并將其運用到進一步具體設計工作中的一種設計方法。我國現(xiàn)行的橋梁抗震設計規(guī)范指出在設計工作中,抗震的概念設計應當受到重視。而橋梁體系的正確選擇是抗震概念設計成功與否的先決因素。本文的研究方向就是在概念設計階段,橋梁體系選擇對抗震性能的影響。矮塔斜拉橋是近三十年出現(xiàn)的一種新型橋梁,由于矮塔斜拉橋抗震性能并不與梁橋或斜拉橋完全相同,同時規(guī)范對該橋型的抗震性能目前還沒有規(guī)律性的總結,因此亟需對矮塔斜拉橋的抗震性能進行深入的研究。本文主要依托實際工程,側重于矮塔斜拉橋在不同約束情況下結構的抗震性能分析,對概念設計的體系選擇進行探討、為類似橋梁結構設計提供參考。在計算方法的選擇上,本文選用非線性時程分析法。通過歷次地震的總結和研究,在抗震方面,依次發(fā)展出了靜力理論、反應譜理論和動力理論等分析方法。非線性時程分析法作為一種主流的動力分析法,不僅可以計算結構線彈性范圍內的反應,也可以考慮非線性的影響,因此,選用其作為主要的分析方法是比較理想的。在具體工作中,本文對一座矮塔斜拉橋——營口市民生路跨鐵路橋進行了仿真計算。通過非線性時程分析法,對兩種不同約束體系下的矮塔斜拉橋,在El-centro地震波作用下的響應結果進行了分析和總結。通過對比民生路橋在不同約束體系下的周期、關鍵部位位移、特征部位內力等地震響應值,得出了墩梁分離的地震抗震性能明顯優(yōu)于墩塔梁固結體系,驗證了正確的橋梁體系選擇對橋梁抗震性能提高的重要性,也是概念設計成功與否的關鍵。
[Abstract]:The seismic design of the bridge includes two aspects, one is the specific parameter design, the other is the seismic conceptual design, which is a reasonable analysis and judgment by the designers through the understanding and summary of the earthquake damage, and applies it to a design method in the further concrete design work. The current seismic design code of bridges in China points out that the conceptual design of seismic resistance should be paid attention to in the design work. The correct choice of bridge system is a prerequisite for the success of seismic conceptual design. The research direction of this paper is the influence of bridge system selection on seismic performance in conceptual design stage. Short tower cable-stayed bridge is a new type of bridge in recent 30 years. Because the seismic performance of low-tower cable-stayed bridge is not exactly the same as that of beam bridge or cable-stayed bridge, at the same time, there is no regular summary of the seismic performance of the bridge type, so it is urgent to carry out in-depth study on the seismic performance of low-tower cable-stayed bridge. Based on practical engineering, this paper mainly focuses on the seismic performance analysis of low tower cable-stayed bridge under different constraints, and discusses the system selection of conceptual design, which provides a reference for similar bridge structure design. In the selection of calculation methods, the nonlinear time history analysis method is selected in this paper. Through the summary and research of previous earthquakes, the static theory, response spectrum theory and dynamic theory are developed in turn. As a mainstream dynamic analysis method, nonlinear time history analysis method can not only calculate the response in the linear elastic range of structures, but also consider the nonlinear influence. Therefore, it is ideal to choose nonlinear time history analysis method as the main analysis method. In this paper, a short tower cable-stayed bridge, Yingkou Minsheng Road Crossing Railway Bridge, is simulated and calculated. By means of nonlinear time history analysis, the response results of low tower cable-stayed bridge under two different constraint systems under El-centro seismic wave are analyzed and summarized. By comparing the seismic response values of Minsheng road bridge under different constraint systems, such as the displacement of key parts and the internal force of characteristic parts, it is concluded that the seismic performance of pier and beam separation is obviously better than that of pier tower beam consolidation system, which verifies the importance of correct bridge system selection to improve the seismic performance of bridges, and is also the key to the success of conceptual design.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U442.55;U448.27

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本文編號：2501670