無(wú)站臺(tái)柱雨棚結(jié)構(gòu)的敏感性分析與安全性評(píng)價(jià)
邢 磊，殷志祥
- 摘 要
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（遼寧工程技術(shù)大學(xué) 建筑工程學(xué)院，阜新 123000）[摘要] 無(wú)站臺(tái)柱雨棚結(jié)構(gòu)的雨棚柱設(shè)置在鐵路線束之間或站場(chǎng)外側(cè)，具有優(yōu)良的通透性，在鐵路客站雨棚建設(shè)中應(yīng)用日益廣泛。以沈陽(yáng)北站無(wú)站臺(tái)柱雨棚結(jié)構(gòu)為研究對(duì)象，綜合運(yùn)用實(shí)證研究和有限元分析相結(jié)合的方法，圍繞其安全服役與狀態(tài)評(píng)價(jià)開展研究。在對(duì)其采用的單向受力斜拉索梁結(jié)構(gòu)體系定性分析基礎(chǔ)上，確定了結(jié)構(gòu)服役期間可能發(fā)生變化的參數(shù)（主桁架梁剛度、主桁架梁密度、拉索性能退化參數(shù)和支撐柱不均勻沉降量）開展敏感性分析，定量評(píng)價(jià)了參數(shù)變化時(shí)引起的變形、應(yīng)力、自振頻率等的敏感程度；在此基礎(chǔ)上，基于客觀化權(quán)重系數(shù)新思想，應(yīng)用提出的兩階段模型修正方法，開展了無(wú)站臺(tái)柱雨棚結(jié)構(gòu)安全性的客觀、定量評(píng)價(jià)。研究表明：針對(duì)沈陽(yáng)北站無(wú)站臺(tái)柱雨棚結(jié)構(gòu)，以變形指標(biāo)最敏感，動(dòng)力指標(biāo)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(shù)（確定性參數(shù)和不確定性參數(shù)）用于模型修正，而且通過(guò)對(duì)敏感性系數(shù)的正值化、歸一化處理，可以客觀、定量確定各指標(biāo)的貢獻(xiàn)程度，算例證明修正結(jié)果精度較高，研究思路和方法適于在同類結(jié)構(gòu)中推廣應(yīng)用。[關(guān)鍵詞] 無(wú)站臺(tái)柱雨棚結(jié)構(gòu); 敏感性分析; 安全評(píng)價(jià); 模型修正中圖分類號(hào)：TU393.3 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2013)S2-0472-06作者簡(jiǎn)介：邢磊（1984-），男，碩士研究生。主要從事大跨度空間結(jié)構(gòu)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
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