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在阐述预应力钢结构发展历程的基础上,根据预应力钢结构中构件类型组成,将预应力钢结构分为刚性、刚柔混合和柔性三种预应力钢结构类型,其中刚柔混合预应力钢结构中的弦支结构是一种典型的预应力钢结构,是目前应用最广泛的结构体系之一。对于预应力钢结构的核心构件——拉索的温度线膨胀系数,建议今后工程设计时采用以理论分析和试验研究为基础的数据,即钢丝绳、钢绞线、半平行钢丝束三种索材的线膨胀系数值分别为1.92×10-5,1.38×10-5,1.87×10-5/℃。在分析弦支结构体系概念的基础上,将其分为平面弦支结构、可分解的空间弦支结构和不可分解的空间弦支结构三类,并对弦支结构体系中拉索的数值模拟理论进行了总结分析。随后分别针对三种弦支结构类型,对其发展历程、结构构成、结构特点以及工程应用进行了分析总结。
Based on the development history of prestressed steel structure, the prestressed steel structure is divided into three types of prestressed steel structure: rigid, rigid-flexible and flexible according to the types of components in prestressed steel structure. Among them, rigid-flexible prestressed The chord structure in steel structure is a kind of typical prestressed steel structure, which is one of the most widely used structural systems. For the core component of prestressed steel - cable temperature coefficient of linear expansion, the proposed future engineering design using theoretical analysis and experimental research as the basis of the data, namely wire rope, strand, semi-parallel steel wire bundle three The linear expansion coefficients were 1.92 × 10-5, 1.38 × 10-5 and 1.87 × 10-5 / ℃, respectively. Based on the analysis of the concept of the chord structure system, this paper divides the chord structure system into three types: the plane chord structure, the resolvable space chord structure and the indecomposable space chord structure. The numerical simulation of the cable in the chord structure system The theory has carried on the summary analysis. Then, the author separately analyzed and analyzed the development history, structure, structural characteristics and engineering application of the three types of chord structure.