螺栓球耗能节点在正放四角锥网架结构中的应用研究

Research on the Utilization of Bolted Spherical Energy-Dissipating Joints in Orthogonally Placed Square Pyramid Space Truss Structures

摘要: 大跨度网架结构因偶然荷载引发的连续性倒塌会造成重大生命财产损失，其核心诱因是关键压杆屈曲失稳。前期已提出一种基于金属剪切吸能与让位效应的螺栓球耗能节点，通过耗能板、大小套筒组成耗能元件实现双重耗能。为验证该节点在实际网架中的抗倒塌效能，本文以33 m × 30 m周边点支撑正放四角锥网架为研究对象，采用ANSYS有限元软件建立“无耗能节点普通网架”与“有耗能节点网架”两类模型，对比分析极限荷载下的结构变形与强度性能。结果表明：螺栓球耗能节点通过降低结构变形与关键杆件轴力，有效保护压杆免失稳，可显著提升网架结构抗连续性倒塌能力，为工程应用提供理论依据。

Abstract: Progressive collapse of long-span space truss structures induced by accidental loads can cause significant losses of life and property, with the core trigger being the buckling instability of key compression members. An earlier study proposed a bolted spherical energy-dissipating joint based on metal shear energy absorption and displacement effect, which realizes dual energy dissipation through energy-dissipating components composed of energy-dissipating plates and large/small sleeves. To verify the anti-collapse efficiency of this joint in practical space trusses, this paper takes a 33 m × 30 m perimeter point-supported orthogonally placed square pyramid space truss as the research object, and uses ANSYS finite element software to establish two types of models: “ordinary space truss without energy-dissipating joints” and “space truss with energy-dissipating joints”. The structural deformation and strength performance under ultimate load are compared and analyzed. The results show that the bolted spherical energy-dissipating joint effectively reduces structural deformation and axial force of key members, thereby protecting compression members from instability. This joint can significantly enhance the progressive collapse resistance of space truss structures, providing a theoretical basis for engineering applications.