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平面型弦支结构体系是一种被广泛认可和应用的新型预应力大跨度结构体系。对平面型弦支结构在形态分析、静动力性能和施工过程分析等方面的研究现状及工程应用情况进行综述,指出关于平面型弦支结构弹塑性分析缺乏的现状。结合近年来频发的暴雪灾害,指出超越雪荷载下开展平面弦支结构弹塑性分析的必要性。在超越雪荷载作用下,数值模拟平面型弦支结构弹塑性极限状态的发展过程,得到平面弦支结构在全跨和半跨超越雪荷载作用下的屈服机制和失效机制,并给出其内力重分布规律和荷载传递规律,为实际工程在超越雪荷载下的分析和设计提供理论依据。
Planar chord structure system is a widely recognized and applied prestressed long-span structural system. The research status and engineering application of the planar chord structure in the aspects of shape analysis, static and dynamic performance and construction process are reviewed. The current situation of the lack of analysis on the elastic and plastic of the planar chord structure is pointed out. Combined with the frequent snowstorm disasters in recent years, it is pointed out that the necessity of elastoplastic analysis of plane chord support structure under snow load is pointed out. Under the action of snow load, the numerical simulation of the elastic-plastic limit state of the planar chord structure was carried out. The yield mechanism and failure mechanism of the plane chord structure under full-span and half-span over snow load were obtained. Redistribution and load transfer laws provide theoretical basis for the analysis and design of actual projects under snow load.