摘要
探讨了檩条体系中拉条的作用,由于冷弯檩条腹板太薄,拉条在拉力作用下发生局部弯曲,使拉条拉力松弛,且相邻檩距内拉条错位导致拉条拉力进一步大幅丧失,而拉条要为平行体系中的所有檩条提供约束,对拉条刚度的需求呈抛物线增长,因此檩条设计中内力分析和稳定性计算时都不宜考虑拉条的作用。最后给出了拉条布置和采用冷弯C形钢代替拉条的建议。
Function of sagrods in parallel purlin system is studied.Due to the small thickness of the cold-formed purlin,its web deforms locally at the sagrod point,slacking occurs in the sagrod,leading to noneffective sagrod.The zigzag arrangement of sagrods in the adjacent bays weakens dramatically the tensile stiffness of the sagrods further.On the other hand,the stiffness demand on the sagrod increases parabolically with the number of the purlins.Combining these factors,it can be concluded that the sagrods in purlin system have negligible effect of the strength and buckling capacity of the purlins.Proposals are presented on the layout of sagrod systems and cold-formed C sections shall be used as sagrods.
作者
童根树
Genshu Tong(Institute of High Performance Structures,Zhejiang University,Hangzhou 310058,China)
出处
《钢结构（中英文）》
2023年第1期66-68,共3页
Steel Construction（Chinese & English）
关键词
檩条
拉条
支撑
刚度
purlin
sagrod
bracing
stiffness
