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在大型空间结构和大跨结构中,采用预应力钢结构技术,可优化结构形式,减小结构自重,降低结构造价,因此被广泛应用于各类基础设施中。其通过预应力作用获得结构整体刚度,如在偶然荷载或环境因素等作用下构件产生的损伤或断裂,将使剩余结构产生新的预应力损失,降低结构整体刚度,甚至导致局部或整体倒塌,严重威胁公共安全,因此开展预应力钢结构的性能诊治技术研究意义重大。分别从结构损伤诊断、抗倒塌分析、性能提升三方面,对预应力钢结构诊治技术的国内外研究与应用现状进行系统总结,在此基础上提出其亟待解决的关键技术问题。
In large-scale space structures and long-span structures, the use of prestressed steel structure technology can optimize the structure, reduce the weight of the structure and reduce the structural cost, so it is widely used in various types of infrastructure. Through the prestressing effect, the overall stiffness of the structure can be obtained. For example, the damage or breakage of the member caused by accidental loading or environmental factors will cause new prestress loss to the remaining structure, reduce the overall stiffness of the structure and even lead to partial or total collapse, Serious threat to public safety, so the performance of prestressed steel structure diagnosis and treatment technology research is of great significance. From the aspects of structural damage diagnosis, anti-collapse analysis and performance improvement respectively, the status quo of research and application of prestressed steel structure diagnosis and treatment technology is systematically summarized. Based on this, the key technical problems to be solved are put forward.