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研究了广州新客站站房大跨度预应力空间结构的预应力控制分析的影响矩阵迭代法,即已知结构在既定强度、刚度目标状态下的位移、索力等,反求结构的初始状态。以此为基础,对广州新客站屋盖结构的单层索壳、三向张弦梁、索拱结构选定了合理的预应力控制目标,分析得到了各区域结构的预应力控制值和零状态控制几何。对索拱结构在胎架张拉阶段和高空张拉阶段的预应力进行了控制,保证了索拱的支座反力处于最小的状态。进一步分析表明,预应力取值合理,结构处于良好的工作状态。
The influence matrix iteration method is used to analyze the prestressed control analysis of the long-span prestressed spatial structure of the Guangzhou New Passenger Station Building. That is to say, the displacement and the cable force of the known structure under the given strength and stiffness target conditions are used to reverse the initial state of the structure. Based on this, a reasonable target of prestress control was selected for the single-layer cable-stayed roof, three-direction stringed beam and cable arch structure in the roof structure of Guangzhou New Passenger Station. The prestressed control values and zero-state control geometry. The control of the prestress of the cable arch structure in the tire-frame tensioning stage and the high-altitude tensioning stage ensures that the bearing reaction force of the cable arch is in the minimum state. Further analysis shows that the value of prestress is reasonable and the structure is in good working condition.