中文摘要：

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。

英文摘要：

The uses of prestressed steel structure technologies in large spatial and long-span structures can optimize structural types, reduce weights and costs of structures, which have been widely used in various infrastructures. This kind of structure obtains structural stiffness through prestressing. Local members would damage or even rupture under the influence of accidental loads and environmental factors, which may lead to the loss of the prestress of remaining structures, the reduction of structural stiffness or the local and global collapse, which can be a serious threat to public safety. Therefore, it is very important to carry out the study on the technology of the performance diagnosis of prestressed steel structures. It would be presented a systematic summary of existing researches and applications of prestressed steel structures through aspects of structural performance diagnosis, anti-collapse analysis and performance improvement respectively. Besides, solutions for key technical issues to be solved would be proposed based on the summary.