Q550钢焊接箱形截面压弯构件的局部稳定和屈曲后强度  

Local buckling and post-buckling strength of Q550 steel welded box section members subjected to combined axial compression and bending

作　　者：申红侠[1,2] 聂子钧 徐凯凯 Shen Hongxia;Nie Zijun;Xu Kaikai(School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;Key Laboratory of Structural Engineering and Earthquake Resistance of the Ministry of Education,Xi'anUniversity of Architectureand Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055

出　　处：《土木工程学报》2022年第10期22-32,共11页China Civil Engineering Journal

基　　金：国家自然科学基金(51978563)。

摘　　要：通过12个Q550D钢短柱的单向偏压试验,研究高强钢焊接箱形截面压弯构件的局部稳定性能和极限承载力;将极限承载力与美国、欧洲和中国钢结构设计规范相关公式计算结果相比较,以验证各规范对Q550D钢焊接箱形截面压弯构件屈曲后强度计算的适用性。结果表明,在翼缘宽厚比b/t=27.9~56.1,腹板高厚比h/t=40.5~80.1,偏心距e_(y)=20~50mm,欧洲和中国规范中的相关公式有较高精度,仍然适用于550D钢焊接箱形截面压弯构件屈曲后强度计算,而美国规范中相关公式有时偏不安全。The local buckling behavior and ultimate carrying capacity of high strength steel welded box section members subjected to combined axial compression and bending were studied by the uniaxial eccentric compression experiment of twelve Q550 D steel short columns.The ultimate carrying capacity obtained from the experiment was compared with those from the calculation formulas in the American, European and Chinese Specifications to verify whether the calculation formulas in the above Specifications can be used for predicting the post-buckling strength of Q550 D steel welded box section members.The research results indicate that the relevant formulas in the European and Chinese Specifications have a higher precision and are still applicable to predict the post-buckling strength of Q550 D steel welded box section members subjected to combined axial compression and bending, while the relevant formulas in the American Specification sometimes are unsafe in the range of flange width-to-thickness ratio b/t=27.9~56.1, web depth-to-thickness ratio h/t=40.5~80.1, and eccentricity e=20~50 mm.

关 键 词：Q550钢 焊接箱形截面 压弯构件 局部稳定 试验研究 屈曲后强度 

分 类 号：TU391[建筑科学—结构工程] TU323.1TU311.2