无站台柱雨棚结构的敏感性分析与安全性评价
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（辽宁工程技术大学 建筑工程学院，阜新 123000）[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新思想，应用提出的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，算例证明修正结果精度较高，研究思路和方法适于在同类结构中推广应用。[关键词] 无站台柱雨棚结构; 敏感性分析; 安全评价; 模型修正中图分类号：TU393.3 文献标识码：A 文章编号：1002-848X(2013)S2-0472-06作者简介：邢磊（1984-），男，硕士研究生。主要从事大跨度空间结构研究。电话：18641871918。E-mail: xinglei515@163.comSensitivity analysis and safety evaluation of non-platform-column canopy structureXing Lei, Yin Zhixiang(College of Architecture and Civil Engineering, Liaoning Technical University, Fuxin 123000, China)Abstract: Columns of non-platform-column canopy structure (NPCCS) are set between the station railways or outside the platform, and the structure is increasing widely used for the excellent permeability. NPCCS in Shenyang North Railway Station (SNRS) is chose as the research object to study its security behavior and state evaluation by the integrated use of empirical research and the finite element analysis. Based on the qualitative analysis of unidirectional beam cable-stayed structure system, the sensitivity analysis on behavior parameters, including the main truss girder stiffness, the density of the main truss girder, the performance degradation parameters of the cable and uneven settlement of columns, is carried out. And the quantitative results, including the reflection, stress, and frequency are acquired. Furthermore, the two-stage model updating method is proposed from the idea of the objective weighting factor, and the objective quantitative evaluation for the safety performance is put forward. Some beneficial results are acquired, which are summarized as followed. For the NPCCS in SNRS, the deformation is the most sensitive indicator, while the dynamic indicator is less sensitive; the proposed two-stage model updating method not only can embody all the parameters (parameter uncertainty or uncertainty parameters) for model updating, but also can quantitatively determine the contribution of each index through the normalization process. Meanwhile numerical examples demonstrate the high precision of correction results, while research ideas and methods adapted in the paper are applicable to similar structure.Keywords: non-platform-column canopy structure; sensitivity analysis; safety evaluation; model updating
