营口民生路矮塔斜拉桥抗震概念设计研究

发布时间：2019-06-18 17:48

【摘要】：桥梁的抗震设计包括两方面,一方面是具体的参数设计,这种方法侧重于计算分析;另一种是抗震概念设计,是设计工作者通过对震害的认识和总结,在抗震设计前期,做出合理的分析和判断,并将其运用到进一步具体设计工作中的一种设计方法。我国现行的桥梁抗震设计规范指出在设计工作中,抗震的概念设计应当受到重视。而桥梁体系的正确选择是抗震概念设计成功与否的先决因素。本文的研究方向就是在概念设计阶段,桥梁体系选择对抗震性能的影响。矮塔斜拉桥是近三十年出现的一种新型桥梁,由于矮塔斜拉桥抗震性能并不与梁桥或斜拉桥完全相同,同时规范对该桥型的抗震性能目前还没有规律性的总结,因此亟需对矮塔斜拉桥的抗震性能进行深入的研究。本文主要依托实际工程,侧重于矮塔斜拉桥在不同约束情况下结构的抗震性能分析,对概念设计的体系选择进行探讨、为类似桥梁结构设计提供参考。在计算方法的选择上,本文选用非线性时程分析法。通过历次地震的总结和研究,在抗震方面,依次发展出了静力理论、反应谱理论和动力理论等分析方法。非线性时程分析法作为一种主流的动力分析法,不仅可以计算结构线弹性范围内的反应,也可以考虑非线性的影响,因此,选用其作为主要的分析方法是比较理想的。在具体工作中,本文对一座矮塔斜拉桥——营口市民生路跨铁路桥进行了仿真计算。通过非线性时程分析法,对两种不同约束体系下的矮塔斜拉桥,在El-centro地震波作用下的响应结果进行了分析和总结。通过对比民生路桥在不同约束体系下的周期、关键部位位移、特征部位内力等地震响应值,得出了墩梁分离的地震抗震性能明显优于墩塔梁固结体系,验证了正确的桥梁体系选择对桥梁抗震性能提高的重要性,也是概念设计成功与否的关键。
[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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55;U448.27

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