無站臺柱雨棚結構的敏感性分析與安全性評價
邢 磊，殷志祥
- 摘 要
-
（遼寧工程技術大學 建筑工程學院，阜新 123000）[摘要] 無站臺柱雨棚結構的雨棚柱設置在鐵路線束之間或站場外側，具有優(yōu)良的通透性，在鐵路客站雨棚建設中應用日益廣泛。以沈陽北站無站臺柱雨棚結構為研究對象，綜合運用實證研究和有限元分析相結合的方法，圍繞其安全服役與狀態(tài)評價開展研究。在對其采用的單向受力斜拉索梁結構體系定性分析基礎上，確定了結構服役期間可能發(fā)生變化的參數（主桁架梁剛度、主桁架梁密度、拉索性能退化參數和支撐柱不均勻沉降量）開展敏感性分析，定量評價了參數變化時引起的變形、應力、自振頻率等的敏感程度；在此基礎上，基于客觀化權重系數新思想，應用提出的兩階段模型修正方法，開展了無站臺柱雨棚結構安全性的客觀、定量評價。研究表明：針對沈陽北站無站臺柱雨棚結構，以變形指標最敏感，動力指標敏感性較低；提出的兩階段模型修正方法，不僅能將所有參數（確定性參數和不確定性參數）用于模型修正，而且通過對敏感性系數的正值化、歸一化處理，可以客觀、定量確定各指標的貢獻程度，算例證明修正結果精度較高，研究思路和方法適于在同類結構中推廣應用。[關鍵詞] 無站臺柱雨棚結構; 敏感性分析; 安全評價; 模型修正中圖分類號：TU393.3 文獻標識碼：A 文章編號：1002-848X(2013)S2-0472-06作者簡介：邢磊（1984-），男，碩士研究生。主要從事大跨度空間結構研究。電話：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
