(1 西安建筑科技大学华清学院， 西安 710043； 2 西部绿色建筑国家重点实验室， 西安建筑科技大学， 西安 710055； 3 中国建筑西北设计研究院有限公司， 西安 710018)

［摘要］迄今为止，国内外针对上部空间结构与下部支承结构协调工作的研究相对较少，采用固定支座、铰支座及滑动支座代替混凝土支承的处理方式无法准确反映结构的实际受力状态。通过对支承在约束方向上提供不同刚度的研究，提出考虑支承刚度的简化计算方法。分别将该简化计算方法、整体计算方法应用于深圳湾体育中心工程中，并与独立屋盖结构的计算结果进行对比，得出了三种计算方法在周期、振型、单元应力、杆件内力、结构位移及支座反力等方面的差异。研究表明：混凝土支承对大跨度空间网格结构模型的整体性能产生了显著影响，且整体结构计算模型的计算结果大多会偏于不利，因此有必要考虑空间结构与下部混凝土支承的协同工作。考虑支承刚度简化的计算模型的分析结果与整体结构计算模型吻合较好，有效地模拟了支承的弹性效应，并在约束方向上对空间结构提供了正确的刚度。

［关键词］大跨度空间网格结构； 混凝土支承； 协同工作； 简化分析方法

中图分类号：TU393-3文献标识码：A文章编号：1002-848X(2019)09-0043-05

Research on the mechanical behavior effect of concrete support for large-span spatial grid structural models and simplified analysis method

Wang Yuan1，2, Jiang Jihong3

(1 Huaqing College, Xi′an University of Architecture and Technology， Xi′an 710043, China；2 State Key Laboratory of Green Building in Western China，  Xi′an University of Architecture and Technology， Xi′an 710055, China； 3 China Northwest Architecture Design and Research Institute Co.， Ltd., Xi′an 710018, China)

Abstract:At present, little attention has been paid to the coordination between upper spatial grid structures and lower concrete supports. However, the methods of replacing concrete supports with fixed supports, hinged supports and sliding supports may not be able to reflect the real situation of structures. A simplified analysis method considering support stiffness was introduced based on different stiffness of supports in the constraint direction. The proposed method and the whole analysis method were eventually implemented in the Shenzhen Bay Sports Center. The results from the above-mentioned method and stand-alone steel roof model were compared. The differences in periods, vibration modes, element stresses, member inner forces, structural displacements and support reaction forces were obtained. The analytical results show that the concrete support has a significant effect for large-span spatial grid structural models and the results obtained from the whole analysis method are more unfavorable. Therefore, it is necessary to consider the coordination between upper spatial grid structures and lower concrete supports. In addition, the results obtained from the simplified analysis method considering support stiffness agreed with the results from the whole analysis method well. The elastic effect of supports was simulated effectively and the correct stiffness of spatial structures in the constraint direction was provided.

Keywords:large-span spatial grid structure; concrete support; interaction effect; simplified analysis method