平面型弦支结构体系及超越雪荷载下的弹塑性分析

CABLE SUPPORTED PLANE STRUCTURE AND ITS ELASTOPLASTIC ANALYSIS UNDER BEYOND SNOW LOAD

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。

Cable supported plane structure is widely accepted and applied in practical engineering as a new prestressing long-span spatial structure.Research status of the cable supported plane structure,such as form-finding analysis,static and dynamic behaviors,construction process and so on,are reviewed,and the characteristics of all research methods were also analyzed.The overviews of the typical projects were made.Combined with disasters of severe snow in the recent years,the elastoplastic ultimate development of the cable supported plane structure is simulated by the finite element method.The yielding mechanism and the failure mechanism of the cable supported plane structure are obtained under snow load over all span and under semi-cross snow load.The development of plasticity and the redistribution of internal force of the cable supported plane structure are summarized,which provide a theoretic basis for the analysis and design of actual projects under beyond snow load.