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详细介绍了贵阳奥体中心主体育场整套预应力施工技术。采取在拉索两端拉一根钢丝绳,由一端向另一端滑移的方法完成拉索安装;采取对称分级的张拉方法,总体上分为3级张拉完成,第1级张拉完成后拆除支撑,而后进行第2和第3级预应力张拉。实践证明,方案技术上合理,降低了施工成本。使用有限元计算软件MIDAS,对预应力施工过程进行了详细的仿真计算分析,计算结果表明,张拉过程中拉索索力相互影响比较小,卸载完成后,结构竖向位移变化较大,张拉完成后,结构竖向位移最大变化为63mm,说明预应力施加对结构竖向变形起到一定控制作用。设计了详细的施工和安全监测方案,监测数据表明索力、结构竖向位移、构件内力与仿真计算分析的偏差都在一个较合理的范围之内,以索力控制为主控参数,竖向位移为第2控制参数,并综合考虑构件内力,确认施工张拉已经达到设计及相关验收标准要求。
Details of the Guiyang Olympic Sports Center main stadium complete set of prestressed construction technology. Take a pull rope at both ends of a rope, from one end of the slide to the other end of the method to complete the cable installation; to take symmetrical grading tension method, generally divided into three levels of tension completed, the first level of tension is completed Support is removed, followed by tensioning of the 2nd and 3rd prestressing. Practice has proved that the program is technically reasonable, reducing construction costs. The finite element calculation software MIDAS is used to carry out a detailed simulation analysis of the prestressing construction process. The calculation results show that the cable forces exert little influence on each other during the tensioning process. After unloading, the vertical displacement of the structure changes greatly and the tension Upon completion, the maximum vertical displacement of the structure was 63mm, indicating that prestressing exerted a certain control on the vertical deformation of the structure. The detailed construction and safety monitoring programs are designed. The monitoring data show that the cable forces, the vertical displacement of the structure, the deviation of the component internal forces and the simulation calculation and analysis are within a reasonable range. Taking the cable force control as the main control parameter, the vertical The displacement is the second control parameter, and considering the internal forces of components, it is confirmed that the construction tension has reached the design and related acceptance standards.