混凝土支承对大跨度空间网格结构力学性能影响及简化分析方法研究
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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。
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.
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.
引文
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[8] 吴轶群,罗永峰,王磊.考虑质量和刚度分布的空间结构支承系统简化方法[J].空间结构,2015,21(2):46-54,59.
[9] 万翔,尹志伟,王健.某局部三层网架与下部支承结构整体工作分析[J].空间结构,2015,21(3):49-53.
[10] 田黎敏,郝际平.深圳湾体育中心钢结构施工非线性时变有限元分析[J].建筑结构学报,2014,35(10):137-143.
[11] 陈彬磊,郭宇飞,柯长华,等.深圳湾体育中心钢结构屋盖设计及研究[J].建筑结构,2011,41(9):1-10.
[2] 陈昆,于敬海,闫翔宇,等.茌平体育馆屋盖弦支穹顶叠合拱与主体混凝土框架协同工作力学性能研究[J].建筑结构,2014,44(12):63-67.
[3] 陈经纬,施刚,陈宏.大跨空间桁架与混凝土支承结构体系协同工作分析[J].四川建筑科学研究,2016,42(1):6-10.
[4] 赵永全,任玉贺,任源.大跨度网架与下部支承结构协同作用分析[J].建筑结构,2014,44(23):49-53.
[5] 范康,赵歆东,张斌,等.等效刚度板模拟网架对下部支承结构的影响分析[J].水利与建筑工程学报,2012,10(5):73-76.
[6] 傅学怡,曹禾,张志宏,等.济南奥体中心体育馆整体结构分析[J].空间结构,2008,14(4):3-7.
[7] 吴勇军,甄庆华.钢网架屋盖和混凝土支承框架的整体性分析[J].建筑结构,2007,37(9):70-73.
[8] 吴轶群,罗永峰,王磊.考虑质量和刚度分布的空间结构支承系统简化方法[J].空间结构,2015,21(2):46-54,59.
[9] 万翔,尹志伟,王健.某局部三层网架与下部支承结构整体工作分析[J].空间结构,2015,21(3):49-53.
[10] 田黎敏,郝际平.深圳湾体育中心钢结构施工非线性时变有限元分析[J].建筑结构学报,2014,35(10):137-143.
[11] 陈彬磊,郭宇飞,柯长华,等.深圳湾体育中心钢结构屋盖设计及研究[J].建筑结构,2011,41(9):1-10.