【摘要】 为研究加劲KK节点的主管轴向应力对其节点承载力的影响,设计并制作了两个试件,以进行主管受拉和主管受压两个工况下的节点承载力试验研究,研究了节点破坏模式、应力分布等力学行为。通过将有限元分析结果和试验结果相比较,验证了有限元模型的可靠性。利用该模型,对考虑不同主管应力情况下的加劲KK节点承载力进行了计算分析。结果表明,主管受拉的节点具有更好的延性,主管受压的节点还易发生主管自身的局部屈曲破坏。主管轴向应力为拉应力时,该节点承载力的下降较为明显。对于所有的主管应力状态,该加劲KK节点的空间调整系数均大于0. 9。更多还原

【Abstract】 In order to study the influence of the chord axial stress on the bearing capacity of stiffened KK-joint,two specimens were designed and fabricated to test the bearing capacity of the joint in the conditions of chord tension and the chord compression respectively. Mechanical behavior including failure modes and stress distribution was experimentally studied. The validity of the finite element( FE) model was verified by comparing the results from FE analysis with the experimental results. Finally,the bearing capacity of stiffened KK-joint subjected to chord pre-loads was attained via the FE model. The results showed that the stiffened KK-joint in the condition of chord tension had better ductility,and the chord wall of the stiffened KK-joint in the condition of chord compression was prone to local buckling. The reduction of the bearing capacity of the stiffened joint was more obvious,while the chord pre-tension was in presence. The correction factor of the stiffening KK-joint should be greater than 0. 9,whether the chord was in tension or compression.更多还原