基于性能的大跨度钢结构设计研究

Performance based design and research of large span steel structures

大跨度钢结构从体系到构件再到节点的破坏形态均可归结为大变形失稳,其安全控制指标包括承载力和变形能力两个方面,国内现行钢结构及相关设计规范对大跨度钢结构体系与节点的性能安全控制指标缺乏系统规定。从大跨度钢结构工程设计实践出发并结合试验研究,通过考虑几何非线性、材料非线性的计算分析,得到体系、构件、节点的荷载-应力、荷载-应变、荷载-位移全过程曲线,对基于延性的承载力与变形能力进行分析研究,提出大跨度钢结构体系与节点的弹性、弹塑性承载力、变形能力控制指标,以及基于性能的大跨度钢结构设计方法。

The failure patterns of the large span steel structure（LSSS） at all levels,from the system level to the member and joint levels,can be attributed to the large deformation instability.The safety control indices for LSSS mainly include the load carrying capacity and the deformation ductility.However,the current Chinese steel design code and other relating design specifications lack the provisions that provide a systematic regulation on the safety performance indices for LSSS at the joint and system levels.Based on a large number of engineering design practices and experimental studies,structural analyses were firstly carried out considering the geometrical non-linearity and material non-linearity.Then the load-stress,load-strain and load-displacement whole process curves were obtained.The strength and deformation ductility of LSSS were carefully investigated.On this basis,the control indices of strength and deformation ductility for systems and joints of LSSS under elastic and elasto-plastic analysis were set up and a ductility performance-based method for LSSS design was put forward.