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日益广泛应用的大跨度张力结构中经常出现一些高度大、负荷重的立柱以支承全部或局部屋面荷载。按常规设计的这些立柱往往截面大,耗材多,成本高,大大抵消了张力屋面的良好经济效益。在钢立柱的设计中采用预应力技术不仅可以达到提高杆件的稳定性和刚度、降低耗钢量及成本的目的,而且还可以改善结构的动力性能,提高其抗震性。 本文研究了预应力钢压杆的静力特性,分析了荷载下的内力分配规律,推导了压杆的临界荷载值及强度极限值,并通过系列模型试验检验了理论分析的可行性及准确程度。
In the increasingly widely used large-span tension structures, some high-heavy, heavy-loaded columns often appear to support all or part of the roof load. The conventionally designed columns often have large cross-sections, many consumables, and high costs, which greatly offset the good economic benefits of the tension roof. The use of prestressing technology in the design of steel pillars can not only improve the stability and rigidity of the poles, reduce the steel consumption and cost, but also improve the dynamic performance of the structure and improve its seismic resistance. In this paper, the static characteristics of prestressed steel pressure bar are studied, the distribution law of internal force under load is analyzed, the critical load value and strength limit value of the pressure bar are deduced, and the feasibility and accuracy of theoretical analysis are tested through a series of model tests. .