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风吸力下冷弯薄壁檩条受力复杂,准确计算其承载性能较困难,中外相关规范的计算规定不尽相同。全面总结了GB 50018、CECS 102、EN 1993-1-3、AISI S100及AS/NZS 4600等规范针对风吸力下冷弯薄壁檩条承载性能的相关设计规定,重点分析了各规范采用的设计方法、计算模型及对屋面系统约束效应的考虑存在的差异,并比较了18组常用C形和Z形截面檩条的计算结果。对比表明,对于风吸力下锁螺钉屋面系统中檩条的稳定承载力,不设拉条时,GB5 0018因未考虑屋面系统的约束效应,计算结果过于保守,EC 3和AISI的计算结果较接近;设2道拉条时,屋面约束效应明显弱化,GB 50018和EC 3的计算结果较接近,AS/NZS的计算结果略大。
Under the wind suction, cold-bending thin-walled purlin is complicated and accurate calculation of bearing capacity is difficult. The calculation rules of relevant norms in China and abroad are not the same. The related design rules of GB 50018, CECS 102, EN 1993-1-3, AISI S100 and AS / NZS 4600 for the bearing capacity of cold-formed thin-walled purlins under wind suction are comprehensively summarized. The design methods adopted by each standard are mainly analyzed , Calculation model and the restraint effect of the roofing system are considered. Comparisons of the calculated results of 18 commonly used C-shaped and Z-shaped cross-sectional purlins are also made. The comparison shows that for the stability of the sliver in the screw-captive roof system under wind suction, GB 5 0018 does not consider the restraint effect of the roofing system and the calculation results are too conservative, and the calculation results of EC 3 and AISI are close. When two pull strips are set, the restraint effect of roofing is significantly weakened, the calculation results of GB 50018 and EC 3 are closer, and the calculation result of AS / NZS is slightly larger.