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预应力混凝土连续梁桥施工控制仿真计算及零号块局部应力分析

发布时间:2019-01-12 19:51  文章来源:笔耕文化传播
【摘要】:预应力混凝土连续梁桥由于具有刚度大、变形小、桥面曲线平缓以及行车舒适等特点,是国内外被广泛采用的桥型之一,其主要施工方法为悬臂施工法。悬臂施工过程中为了达到预期的目标包括结构线形和内力要求,进行施工控制仿真计算分析,建立有限元模型,模拟计算分析每一施工阶段结构内力和挠度变化,采取一定的施工控制措施,使成桥后结构内力和桥面线形满足设计要求。 施工控制计算方法主要有:正装计算法倒装计算法无应力状态法。由于实际桥梁施工过程中各种荷载及不确定因素的影响,与理想的桥梁施工状况存在着较大的误差,一般采用最小二乘法和卡尔曼滤波法进行施工控制误差调整。 本文的研究对象是跨径为60+105+60m的预应力混凝土连续梁,运用有限元程序对施工过程进行仿真计算分析,,并且提取了最大悬臂段边跨合拢阶段中跨合拢阶段成桥阶段运营阶段等关键施工阶段的内力图,而且分析了在这些关键施工阶段截面弯矩和应力变化情况。由监控实测施工阶段标高与应变与理论计算值比较来,检验施工控制效果。 连续梁的零号块是一个复杂的受力结构,是主要的承重部分,尤其是在最大悬臂阶段要承受巨大的荷载作用。运用杆系模型不能准确真实反映局部应力分布情况,因此采用FEA软件建立零号块模型进行局部应力分析,分别对零号块顶板底板腹板横隔板的纵向横向及主应力分布状况进行计算分析,分析零号块局部应力对于解决零号块裂缝较多这一问题,具有重要意义和指导作用。
[Abstract]:Prestressed concrete continuous beam bridge is one of the most widely used bridges at home and abroad because of its large stiffness, small deformation, smooth curve of deck and comfortable driving. The main construction method is cantilever construction method. In order to achieve the expected objectives, including the structure alignment and internal force requirements, the construction control simulation calculation and analysis are carried out, the finite element model is established, and the structural internal force and deflection changes in each construction stage are simulated and analyzed. Certain construction control measures are adopted to make the internal force of the structure and the line shape of the bridge deck meet the design requirements after the completion of the bridge. Construction control calculation methods are mainly: the formal calculation method? Reverse calculation? Stress free state method. Due to the influence of various loads and uncertain factors in the actual bridge construction, there is a large error with the ideal bridge construction condition. The least square method and Kalman filter method are generally used to adjust the construction control error. The research object of this paper is the prestressed concrete continuous beam whose span is 6010560m. The finite element program is used to simulate and analyze the construction process, and the maximum cantilever section is extracted. Side span closing phase? Middle span closing stage? The bridge stage? The internal force diagrams of key construction stages such as operation stage are analyzed and the variation of cross-section bending moment and stress in these key construction stages are analyzed. The effect of construction control is tested by comparing the measured elevation and strain with the calculated values. The zero block of continuous beam is a complex structure, which is the main load-bearing part, especially in the maximum cantilever stage. The use of the bar system model can not accurately reflect the local stress distribution, so the FEA software is used to establish the zero block model for local stress analysis, respectively for the zero block roof? Floor? Web? Transverse diaphragm longitudinal? The distribution of transverse and principal stresses is calculated and analyzed. It is of great significance and guidance to analyze the local stress of block zero in order to solve the problem that there are more cracks in block zero.
【学位授予单位】:长安大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:U445;U448.215

【参考文献】

相关期刊论文 前3条

1 刘黎明,宁平华,熊正元,黄道沸;主跨138m预应力混凝土连续梁桥的施工控制[J];城市道桥与防洪;2002年01期

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