无站台柱雨棚结构的敏感性分析与安全性评价

发布时间：2019-04-22 19:45

【摘要】：无站台柱雨棚结构的雨棚柱设置在铁路线束之间或站场外侧,具有优良的通透性,在铁路客站雨棚建设中应用日益广泛。以沈阳北站无站台柱雨棚结构为研究对象,综合运用实证研究和有限元分析相结合的方法,围绕其安全服役与状态评价开展研究。在对其采用的单向受力斜拉索梁结构体系定性分析基础上,确定了结构服役期间可能发生变化的参数(主桁架梁刚度、主桁架梁密度、拉索性能退化参数和支撑柱不均匀沉降量)开展敏感性分析,定量评价了参数变化时引起的变形、应力、自振频率等的敏感程度；在此基础上,基于客观化权重系数思想,应用两阶段模型修正方法,开展了无站台柱雨棚结构安全性的客观、定量评价。研究表明：针对沈阳北站无站台柱雨棚结构,以变形指标最敏感,动力指标敏感性较低；提出的两阶段模型修正方法,不仅能将所有参数(确定性参数和不确定性参数)用于模型修正,而且通过对敏感性系数的正值化、归一化处理,可以客观、定量确定各指标的贡献程度,算例表明修正结果精度较高,本文的研究思路和方法适于在同类结构中推广应用。
[Abstract]:The structure of rain shed without station column is arranged between railway harness or outside of station yard. It has excellent permeability and has been widely used in the construction of railway station rain shed. Taking the structure of rain shed without platform column in north station of Shenyang as the research object, the research is carried out around its safe service and state evaluation by combining the empirical research and finite element analysis with the method of the combination of the empirical study and the finite element analysis. Based on the qualitative analysis of the unidirectional cable-stayed cable beam structure system, the parameters (stiffness of the main truss beam, density of the main truss beam), which may change during the service period of the structure, are determined. The sensitivity analysis of cable performance degradation parameters and inhomogeneous settlement of support column was carried out, and the sensitivity of deformation, stress and self-vibration frequency caused by the change of parameters was quantitatively evaluated. On this basis, based on the idea of objective weight coefficient, the objective and quantitative evaluation of the structural safety of rain shed without platform column is carried out by applying the two-stage model modification method. The results show that the deformation index is the most sensitive and the dynamic index is less sensitive to the structure of rain shed without platform column in the north station of Shenyang. The proposed two-stage model correction method can not only apply all the parameters (deterministic parameters and uncertain parameters) to model modification, but also can be objective by normalizing and normalizing the sensitivity coefficient. The quantitative determination of the contribution degree of each index shows that the accuracy of the modified results is high. The research ideas and methods presented in this paper are suitable for popularization and application in similar structures.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU311.2

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