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针对凯威特六型胶合木网壳节点,设计并制作了12个足尺节点试件。进行了在胶合木构件轴压力为0、100、200 k N和300 k N共4种工况下节点的受弯承载性能试验,对节点抗弯刚度和受力性能进行分析,研究节点的弯矩-转角关系、节点域破坏模式及其与构件轴压力的关系。结果表明:节点域破坏模式可分为胶合木构件受压破坏、受拉破坏和界限破坏。节点域胶合木构件受拉破坏的节点受弯承载力随木构件轴压力的增大而增加。随着胶合木构件轴压力的增加,节点的初始抗弯刚度增大。发生节点域胶合木构件受压破坏的节点,其刚度较木构件受拉破坏的节点有较大提高。试验测得了节点的荷载-位移曲线和弯矩-转角曲线,并拟合得到了弯矩-转角关系方程,结果表明适度的木构件轴压力有助于提高节点连接的延性。
Aimed at six types of Kaiweite veneer grid nodes, 12 full-scale nodes specimens were designed and fabricated. The flexural bearing capacity tests of four joints under four axial pressures of 100, 100, 200 kN and 300 kN were carried out. The flexural rigidity and mechanical behavior of the joints were analyzed. Moment - rotation relationship, failure mode of node domain and its relationship with member shaft pressure. The results show that the failure mode of the node domain can be divided into compression damage, tension failure and boundary damage of veneer wood components. The flexural bearing capacity of nodes damaged by tensioning of the joint domain in the nodal domain increases with the increase of the axial pressure of the wooden component. With the increase of the shaft pressure of the veneer, the initial bending stiffness of the joint increases. In the node domain, the joints damaged by the compression of the veneer lumber members have a greater rigidity than the joints damaged by the timber members. The load-displacement curves and bending moment-rotation curves of the joints were measured and the bending moment-rotation relationship was fitted. The results show that the proper shaft pressure of the wooden members can help to improve the ductility of joints.