胶合木网壳半刚性节点受力性能试验研究

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 kN和300 kN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。

Experimental investigation on mechanical performance of semi-rigid joints in reticulated glulam shells

A typical joint detail in Kiewitt-6 reticulated glulam shells was designed, and 12 full scale joints were manufactured. Bending tests were conducted on the joints under different amplitudes of axial compression loads, including four load cases of 0, 100, 200 kN and 300 kN, respectively. The bending stiffness and bending capacity of joints were evaluated, and the relationships between moment and rotation and between the failure modes of joint zone and the amplitude of axial force also were studied. It is found that three different failure modes in the glulam members of the joint zone might happen, including the failure in the compression zone of glulam member, failure in the tension zone of glulam member and the boundary failure involving failure in both the compression and the tension zones of glulam member. The bending capacity of joint with tensile zone failure increases with the increase of the amplitude of axial compressive force. The initial bending stiffness of joint increases with the increase of the amplitude of axial compressive force.The bending capacity of joint with failure in compressive zone of wood member is larger than that with failure in tensile zone of wood member. From the obtained moment-rotation test curves and regressed equations of joints under different amplitudes of axial compressive force, it is found that the moderate amplitude of axial compressive force applied on wood member is beneficial to enhance the ductility of joint.