天津南站主体结构抗震性能研究

发布时间：2018-11-01 15:10

【摘要】：为适应高速铁路建设的快速发展需求,具有显著优点的“站桥合一”式车站结构被普遍的运用到新型车站中。其具有结构空间刚度大、抗震能力强、占地较小等优点,在既有的高速铁路高架车站中得以广泛应用。由于目前国内外尚缺乏针对该种类型结构的抗震设计规范,一般在设计时采用上部车站结构满足建筑抗震设计规范,下部桥梁结构满足铁路工程抗震设计规范的方法进行抗震设计。由于规范设计理念的不同,加上此类结构构造的复杂性,致使对结构整体的抗震分析与设计存在着困难。在强震作用下,尚不能准确地了解该类结构的地震响应规律、塑性屈服机制以及其潜在的薄弱环节,难以对结构的抗震性能做正确的评估。论文以天津南站为研究对象,经过合理的简化模型,对结构进行了地震响应分析,进而对该种结构的抗震性能进行评估。本论文的研究工作如下： (1)运用MIDAS/GEN软件,利用结构的简化模型,对结构进行了自振特性分析。分析结果表明：结构存在竖向质量、刚度分布不均匀的现象,由于结构楼板大开洞的影响,致使结构的扭转作用较大。 (2)通过对结构的小震与中震条件下的反应谱分析,得到结构的层间位移角、剪重比、刚度比等各项指标均符合规范规定的限值,利用动力时程的分析方法对反应谱分析的结果进行验证。 (3)通过对结构静力弹塑性分析,得到结构的性能点,评价结构在性能点处的抗震性能。之后利用动力时程分析验证,对结构的整体抗震性能做出评价。 (4)基于对结构静力弹塑性分析的结果,以谱加速度作为地震动参数的代表值,以结构的最大层间位移角作为结构易损性的性能指标,绘制出了不同性能指标下结构的易损性曲线。
[Abstract]:In order to meet the needs of the rapid development of high-speed railway construction, the "station and bridge in one" station structure with remarkable advantages has been widely used in the new type stations. It has the advantages of large spatial stiffness, strong seismic capacity and small area. It is widely used in existing high speed railway elevated stations. Due to the lack of seismic design code for this type of structure at home and abroad, the superstructure is generally used to satisfy the seismic design code for buildings. The method of aseismic design of the lower bridge structure meets the seismic design code of railway engineering. Due to the difference of design concept and the complexity of this kind of structure, the seismic analysis and design of the whole structure are difficult. Under the action of strong earthquake, the seismic response law, plastic yield mechanism and its potential weak link of this kind of structure can not be accurately understood, so it is difficult to make a correct evaluation of the seismic performance of this kind of structure. Taking Tianjin South Railway Station as the research object, the seismic response of the structure is analyzed through a reasonable simplified model, and then the seismic performance of the structure is evaluated. The research work of this paper is as follows: (1) the natural vibration characteristics of the structure are analyzed by using the MIDAS/GEN software and the simplified model of the structure. The analysis results show that the vertical mass and the uneven distribution of stiffness exist in the structure, and the torsional effect of the structure is great due to the influence of the large opening of the floor slab of the structure. (2) through the analysis of the response spectrum of the structure under the condition of small earthquake and moderate earthquake, the interstory displacement angle, shear weight ratio and stiffness ratio of the structure are all in accordance with the limit values stipulated in the code. The dynamic time history analysis method is used to verify the results of the response spectrum analysis. (3) through the static elastic-plastic analysis of the structure, the performance points of the structure are obtained, and the seismic performance of the structure at the performance point is evaluated. Then the seismic performance of the whole structure is evaluated by dynamic time history analysis. (4) based on the results of the static elastoplastic analysis, the spectral acceleration is taken as the representative value of the ground motion parameters, and the maximum interstory displacement angle of the structure is taken as the performance index of the structural vulnerability. The vulnerability curves of structures with different performance indexes are drawn.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U238;U291.1;U442.55

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