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(1 西安建筑科技大學(xué)華清學(xué)院， 西安 710043； 2 西部綠色建筑國家重點(diǎn)實(shí)驗(yàn)室， 西安建筑科技大學(xué)， 西安 710055； 3 中國建筑西北設(shè)計(jì)研究院有限公司， 西安 710018)

［摘要］迄今為止，國內(nèi)外針對上部空間結(jié)構(gòu)與下部支承結(jié)構(gòu)協(xié)調(diào)工作的研究相對較少，采用固定支座、鉸支座及滑動支座代替混凝土支承的處理方式無法準(zhǔn)確反映結(jié)構(gòu)的實(shí)際受力狀態(tài)。通過對支承在約束方向上提供不同剛度的研究，提出考慮支承剛度的簡化計(jì)算方法。分別將該簡化計(jì)算方法、整體計(jì)算方法應(yīng)用于深圳灣體育中心工程中，并與獨(dú)立屋蓋結(jié)構(gòu)的計(jì)算結(jié)果進(jìn)行對比，得出了三種計(jì)算方法在周期、振型、單元應(yīng)力、桿件內(nèi)力、結(jié)構(gòu)位移及支座反力等方面的差異。研究表明：混凝土支承對大跨度空間網(wǎng)格結(jié)構(gòu)模型的整體性能產(chǎn)生了顯著影響，且整體結(jié)構(gòu)計(jì)算模型的計(jì)算結(jié)果大多會偏于不利，因此有必要考慮空間結(jié)構(gòu)與下部混凝土支承的協(xié)同工作?？紤]支承剛度簡化的計(jì)算模型的分析結(jié)果與整體結(jié)構(gòu)計(jì)算模型吻合較好，有效地模擬了支承的彈性效應(yīng)，并在約束方向上對空間結(jié)構(gòu)提供了正確的剛度。

［關(guān)鍵詞］大跨度空間網(wǎng)格結(jié)構(gòu)； 混凝土支承； 協(xié)同工作； 簡化分析方法

中圖分類號：TU393-3文獻(xiàn)標(biāo)識碼：A文章編號：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