摘要
为了研究双相型不锈钢材料轴心受压构件的整体稳定性能,对11根EN 1.4462双相型不锈钢焊接工字形截面柱试件进行了轴心受压试验研究。根据试验前测量得到的试件几何初弯曲和试验过程中量测得到的荷载初始偏心,分析了该类型构件的失稳模态和整体稳定承载力,并将试验数据计算结果与采用现行欧洲钢结构设计规范EN 1993-1-4和GB 50017—2003《钢结构设计规范》的计算结果进行了对比。结果表明:所有试件均呈现整体失稳,其中5根试件为强轴失稳模式,6根试件为弱轴失稳模式,未发生板件的局部屈曲,部分绕强轴失稳的试件发生了扭转现象;长细比较大的构件易发生弹性失稳,长细比较小的构件易发生弹塑性失稳;试验数据高于欧洲钢结构规范计算结果,欧洲规范的设计曲线较为保守;试验结果整体低于GB 50017—2003规范的设计曲线,该规范不再适用于不锈钢构件的稳定承载力计算。
In order to research the overall buckling behavior of the duplex EN 1. 4462 stainless steel I-shaped columns under axial compression, experiments on eleven full-scale specimens were conducted. According to the initial bending measured before the test, and loading eccentricity obtained during the test, failure mode and buckling capacity of all the columns were clarified based on the experimental results, and calculated results were compared with current European steel structure design code（EN 1993-1-4） and Chinese steel structure design code （GB 50017--2003）. According to the test results, all the specimens fail in overall buckling mode （five are strong axis buckling mode and six are weak axis buckling mode ） and no local buckling occurs, and torsional phenomenon is observed in some specimens. Besides, specimens with relatively large slenderness are prone to elastic buckling, and specimens with relatively small slenderness are prone to elasto-plastic buckling. The tested buckling strengths are relatively higher than those in EN 1993-1-4, indicating that the design curves from EN 1993-1-4 are generally conservative. However, the test values are relatively lower than those in GB 50017--2003, indicating that the design curves from GB 50017--2003 are generally unsafe.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2015年第7期99-105,共7页
Journal of Building Structures
基金
国家自然科学基金项目(51108007)
中国博士后科学基金特别项目(2014T70020)
关键词
双相型不锈钢
焊接工字形截面
柱
轴压试验
整体稳定
承载性能
duplex stainless steel
welded I section
column
axial compression test
overall buckling
bearingcapacity
