Q550GJ高强钢焊接箱形截面残余应力试验研究  

EXPERIMENTAL STUDY OF RESIDUAL STRESSES IN Q550GJ HIGH-STRENGTH STEEL WELDED BOX SECTIONS

作　　者：邱林波[1,2,3] 侯兆新[1,3] 刘毅 舒赣平[4] 薛素铎 

机构地区：[1]中冶建筑研究总院有限公司,北京100088 [2]北京工业大学建筑工程学院,北京100124 [3]国家钢结构工程技术研究中心,北京100088 [4]东南大学,南京210096

出　　处：《工业建筑》2015年第5期111-114,165,共5页Industrial Construction

基　　金：国家科技支撑计划项目(2012BAJ13B01)

摘　　要：为了研究国产Q550GJ高强钢焊接箱形截面构件的残余应力分布情况,根据其力学性能,设计和加工了6个Q550GJ高强结构钢焊接箱形截面构件,采用分割法对其进行残余应力试验。基于试验测量数据,得到不同试件的残余应力分布,研究板件宽厚比、板件厚度等几何尺寸对残余应力的影响。研究结果表明:高强钢Q550GJ焊接箱形截面构件的翼缘和腹板两端近焊缝区域出现较大的残余拉应力,翼缘和腹板中部呈现大小基本不变的残余压应力区,其余部位为由残余拉应力到残余压应力转变的过渡区域。随着宽厚比的提高,翼缘和腹板残余压应力值相应减小,残余拉应力值的变化规律不明显,有增大的趋势,且残余拉应力值均小于高强钢Q550GJ的屈服强度。在相同宽厚比情况下,焊接箱形截面构件厚度增加后,翼缘和腹板的残余压应力和残余拉应力相应减小。In order to investigate the distribution of residual stress in Q550GJ high strength steel welded box sections, 6 specimens of Q550GJ with various dimensions were designed and manufactured according to its mechanical properties.The partition method was adopted to test the residual stress of these specimens.The distributions of the residual stresses in these specimens were obtained through the test data.The effects of the plate width-thickness ratio and plate thickness were studied.The analysis results showed that there were bigger residual tensile stress in the middle of the flanges and near the welded regions of the web, there were almost the same residual compression stress in the middle of the overhanging regions of the flanges and the web, and the residual stress of other regions for the specimen was transferred from the tensile stress to the compression stress.The residual compression stress was becoming smaller as the increasing of the width-thickness ratio, the changes in the residual tensile stress were not significant, and they were a trend of increasing.The biggest residual tensile stress was lower than the yield stress of the steel.Under the same width-thickness ratio, the residual tensile stress and compression stress were decreased with the increasing of the thickness of the welded specimen.

关 键 词：高强钢 焊接箱形截面 残余应力 

分 类 号：TU758.11[建筑科学—建筑技术科学]