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基于已有的承载力试验研究结果,对屈服强度550MPa高强冷弯薄壁型钢中常用的卷边槽形截面轴压构件和偏压构件的计算模式不定性进行了分析,并统计分析了高强冷弯薄壁型钢强度不定性、几何特性不定性。在此基础上,采用改进一次二阶矩方法,按现有规范的抗力分项系数要求,计算了高强冷弯薄壁型钢卷边槽形截面轴压构件和偏压构件不同可能荷载组合下的可靠指标。结果表明:对于宽厚比符合规范要求的屈服强度550MPa高强冷弯薄壁型钢卷边槽形截面轴压构件和偏压构件,按现有规范的抗力分项系数计算得到的可靠指标均能满足目标可靠指标的要求,证明了所采用的承载力计算方法的适用性;但对于宽厚比超出规范要求的轴压和偏压构件,计算得到的可靠指标不能满足目标可靠指标的要求。
Based on the existing research results of bearing capacity test, the uncertainty of calculation mode of the commonly used curling groove section axial compressive members and biasing members in yield strength 550MPa high-strength cold-formed thin-walled section steel was analyzed. Bending thin-walled steel strength uncertainty, uncertainty of geometric properties. On the basis of this, a modified second-order moment method is used to calculate the influence of different partial load on the curling groove cross-section of high-strength cold-formed thin-wall steel Reliable indicators. The results show that the reliable index calculated according to the existing resistance coefficient can meet the requirement that the ratio of thickness to thickness meets the specification requirements of 550MPa high strength cold-formed thin-walled steel roll-nosed channel cross-section axial compression member and biasing member, Reliable index requirements, the applicability of the bearing capacity calculation method adopted is proved. However, the calculated reliable index can not meet the requirements of the target reliability index for the axial compression and bias components whose aspect ratio exceeds the specification.