建筑结构学报2011，Vol.32Issue(6)：76-81,6.
冷弯厚壁矩形型钢管冷弯效应
Strain hardening of thick-walled cold formed steel rectangular hollow section
摘要
Abstract
Tests on mechanical characteristics of the flat portion, corner portion, virgin steel and full section stub column were conducted for the thick-walled cold formed steel tube with sectional dimension of 200mm × 300mm × 9.2mm.Variation in mechnical properties of the flat and corner portion with passes were analyzed according to the cold forming technology.Strain hardening of thick-walled steel was compared with that in reference [7].The increase of yield strength resulted from the cold-forming work were calculated based on the specifications in North America, China and reference[7]respectively.The results show that both of the first two specifications don't fit for the thick-walled cold formed steel.The specification abroad for prediction of thick-wall cold formed steel stub column is more dangerous than Chinese specification.Widmanstatten microstructure formed in material is the ultimate cause of high strength and low plasticity of the flat portion specimens with welding line.The sweating heat reduces the strength of plate specimens and even results in that the strength of the flat portion bilateral is lower than that of the virgin steel.关键词
冷弯厚壁矩形型钢管/静载试验/力学性能/冷作硬化效应/结构强度设计Key words
thick-walled cold formed steel with rectangular hollow section/ static test/ mechanical properties/ strain hardening/ structural strength design分类
建筑与水利引用本文复制引用
胡盛德,李立新,周家林..冷弯厚壁矩形型钢管冷弯效应[J].建筑结构学报,2011,32(6):76-81,6.基金项目
钢铁冶金及资源利用省都共建教育部重点实验室开放基金项目(FMRU2007Y01). （FMRU2007Y01）
