冷弯薄壁卷边槽钢檩条的有效截面分析

ANALYSIS OF EFFECTIVE SECTION OF COLD-FORMED THIN-WALL LIPPED CHANNEL PURLINS

在分析比较Eurocode 3(EN 1993-1-3)和GB 50018—2002《冷弯薄壁型钢结构技术规范》的基础上,针对冷弯薄壁卷边槽钢檩条的有效截面进行探讨和对比分析。计算结果表明:GB 50018—2002计算有效截面模量相对保守,按Eurocode 3(EN 1993-1-3)计算相对合理。在满应力状况下,对于采用2 mm厚C180—C250规格的冷弯薄壁卷边槽钢檩条,有效截面模量的折减系数分别可取为0.9(Q235钢材)和0.8(Q345钢材)。

Based on the contrast analysis of Eurocode 3( EN1993- 1- 3) and Technical Code of Cold-Formed Thin-Wall Section Steel Structure( GB 50018—2002),analysis and discussion are mentioned about the effective section of cold-formed thin-wall lipped channel purlins. The results showed that the provisions of the effective section modulus in the GB 50018—2002 specifications were too conservative,while the results were close to each other by the Eurocode 3 and facts. Under full stress condition,the reduction factor of the effective section modulus of cold-formed thin-wall lipped channel purlins from C180 to C250( 2 mm thickness) was 0. 9( Q235 steel) and 0. 8( Q345 steel) respectively.