乌江特大桥索塔锚固区节段足尺模型试验参数的确定

发布时间：2018-01-22 12:33

本文关键词： 斜拉桥锚固区有限元分析最不利节段　出处：《土木工程与管理学报》2017年04期 　论文类型：期刊论文

【摘要】：本文以遵贵扩容高速公路乌江特大桥为依托,对斜拉桥索塔锚固区段进行了分析研究,综合考虑设计索力大小、斜拉索角度、索塔整体受力叠加效应等综合因素,按最不利原则确定截取的索塔锚固区节段。针对所截取节段分别向上、向下延伸一定距离,以保证结构应力受模拟边界条件影响较小,同时分别取不同节段高度同实桥模型一样施加预应力、斜拉索索力、重力三项荷载,将有限元计算结果与实桥的计算模型进行比较,找出开裂能力与实桥一致的模型节段高度。文章首先介绍了乌江特大桥上塔柱斜拉索锚固区整体分析时所取用的模型情况,用ANSYS有限元软件模拟了整体模型在设计索力下的工作性能,通过对计算结果的分析,确定模型在设计索力下产生最大应力的最不利节段位置,并且给出索塔锚固区足尺试验研究所需的最不利节段高度。
[Abstract]:Based on Wujiang Bridge of Zhougui Expressway, the cable tower Anchorage section of cable-stayed bridge is analyzed and studied in this paper. The design cable force and the angle of stay cable are considered synthetically. According to the most unfavorable principle, the anchoring section of the cable tower is determined. According to the integrated factors such as the superposition effect of the integral force on the cable tower, the section of the intercepted section is separately upward and extends down a certain distance. In order to ensure that the stress of the structure is less affected by the simulated boundary conditions, at the same time take different section height as the same as the real bridge model to apply prestressing force, cable force and gravity. The finite element results are compared with the real bridge model. To find out the height of the model segment which is consistent with the cracking ability of the real bridge. Firstly, the paper introduces the model used in the overall analysis of the cable anchoring area of the tower column on the Wujiang super bridge. The ANSYS finite element software is used to simulate the working performance of the whole model under the design cable force. Through the analysis of the calculation results, the position of the most unfavorable segment of the model with the maximum stress under the design cable force is determined. At the same time, the most unfavorable section height needed for full scale test study of cable tower Anchorage area is given.
【作者单位】：武汉工程大学资源与土木工程学院;华中科技大学土木工程与力学学院;
【基金】：国家自然科学基金(51408443) 贵州省交通厅科技项目(2015-122-051) 武汉工程大学研究生教育创新基金项目(CX2015044)
【分类号】：U448.27
【正文快照】： 斜拉桥预应力混凝土索塔锚固区是斜拉桥塔柱受力的核心部位,锚固区的抗裂性能及破坏安全储备是整个塔柱结构受力性能的关键,也是结构设计和分析的关键指标。鉴于索塔锚固区的重要性,通常大型混凝土斜拉桥都针对索塔锚固区进行模型试验[1~4]。目前,在斜拉桥索塔锚固区应力分析

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