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基于空腹桁架的弯矩分布规律,提出了双竖腹杆空腹桁架的概念。双竖腹杆空腹桁架的节间距和上、下弦杆的弯矩小于单腹杆空腹桁架。当采用空心钢管作构件时,这类空腹桁架适用于杆件截面超出现有规格的大跨空腹桁架。采用非线性有限元法和均匀设计法研究方钢管连接π型节点的极限承载力。
Based on the bending moment distribution law of fasting truss, the concept of double vertical web truss is proposed. The pitch of the double vertical webs and the bending moment of the upper and lower chords are smaller than that of the single webs. When using hollow steel pipe as a component, this type of fasting truss is suitable for large-span fast-track trusses with bar cross sections beyond the existing specifications. Nonlinear finite element method and uniform design method were used to study the ultimate bearing capacity of square steel pipe connected with π-type joints.