预应力钢结构抗火研究现状

THE RESEARCH ACTUALITY ON THE FIRE-RESISTANCE OF PRESTRESSED STEEL STRUCTURE

预应力技术与现代钢结构的完美结合,形成了全新的现代预应力空间钢结构体系,这种体系完美地解决了大跨空间建筑对结构体系的要求,在世界各地的体育场馆、展览馆等建筑物中得到广泛应用。但该类建筑功能复杂,火灾隐患大,火灾时更易引起人员伤亡,且火灾作用下钢材力学性能退化、预应力筋松弛,造成正常使用荷载下建筑结构的损伤、破坏甚至倒塌,因此对预应力钢结构进行抗火性能的研究尤为重要。为此系统论述了预应力钢结构抗火研究的重要性和研究现状,同时指出了其中存在的某些未完善的问题和进一步的研究方向。

The perfect combination of prestressing technology and modern steel structure,formed a new modern prestressed space steel structure system that was the perfect solution to the requirements of large span space construction of structural system and widely used in the world of sports stadiums,exhibition halls and other buildings.But these buildings functional complex,large fire hazards,fire caused more casualties,and the mechanical properties of steel degenerated under fire,prestressing tendons relaxed,thus resulting in the damage of structures under normal using load,destruction or even collapse. So the study on fire resistance performance of the prestressed steel structure is particularly important,this paper systematically discusses the importance and the present research situation of fire resistance of prestressed steel structure,and points out some outstanding problems and further research directions.