摘要
平面管桁架在大跨度屋盖结构、幕墙结构中应用较广,由于其腹杆与弦杆相贯节点的半刚性,其平面外的稳定性难以进行准确的分析,而往往通过设置次桁架或支撑的方式予以保证,对建筑效果造成影响。以某体育馆平面管桁架结构屋盖为例,在设计过程中取消了大部分次桁架,在下弦平面外未设支撑。基于MIDAS GEN及MIDAS FEA NX建立了多尺度模型,并通过与刚接和铰接模型的对比,对结构在风吸力作用下的整体稳定性进行了分析。结果表明:节点刚度对结构平面外稳定影响显著,简单地采用刚接或者铰接假定进行稳定性分析,将导致较大的误差。多尺度计算模型可以真实地反映节点的刚度,本例钢结构屋盖在风吸力作用下的结构稳定性可以满足要求。
The plane pipe truss is widely used in large-span roof structures and curtain wall structures.Due to the semi-rigidity of the intersecting joint between the web member and the chord member,it is difficult to accurately analyze the out-of-plane stability.It is often guaranteed by setting secondary trusses or supports,which affects the building effect.In this paper,the plane pipe truss structure roof of a gymnasium is taken as an example.In the design process,most of the secondary trusses are cancelled,and no support is set outside the lower chord plane.Based on MIDAS GEN and MIDAS FEA NX,a multi-scale model was established,and the overall stability of the structure under wind suction was analyzed by comparing with the rigid and hinged models.The results show that the joint stiffness has a significant effect on the out-of-plane stability of the structure.Simply using rigid or hinged assumptions for stability analysis will lead to large errors.The multi-scale calculation model can truly reflect the stiffness of the joints.The structural stability of the steel structure roof under the action of wind suction can meet the requirements.
作者
刘晟
Liu Sheng(Hunan Fangyuan Architecture Engineering Design Company Limited,Changsha Hunan 430000,China)
出处
《山西建筑》
2024年第8期49-52,共4页
Shanxi Architecture
