应县木塔叉柱—斗栱连接节点受力性能研究

STRUCTURAL BEHAVIOR OF THE FORK-COLUMN DOU-GONG CONNECTION OF YINGXIAN WOODEN PAGODA

  • 摘要: 以应县木塔局部偏斜最严重的二层明层叉柱—斗栱连接节点为研究对象,制作了两种不同柱肢长度的1∶3缩尺节点模型各2个,分别对其进行两个方向的拟静力试验。通过试验获得了两种节点在两个方向加载时的运动行为模式、变形破坏特征和滞回抗震性能。试验结果表明:节点主要发生柱头枋、铺板枋和出头木的横纹受压变形以及内部部分暗销的横纹剪切变形。长柱肢模型叉柱和下方斗栱的整体性要好于短柱肢模型,长柱肢模型的承载力和大位移下的抗侧刚度大于短柱肢模型,节点在面阔方向上的承载力和抗侧刚度要大于进深方向。建立了节点的精细化有限元模型,对试验过程进行了数值模拟分析,计算结果与试验结果吻合较好。在参数分析基础上,建立了考虑木材顺纹抗压强度和摩擦系数的节点恢复力模型。研究成果可为木塔结构整体分析提供支撑。

     

    Abstract: This study investigates the fork-column dou-gong connections in the second visible layer of the Yingxian Wooden Pagoda, where local skewing is most severe. Four 1∶3 scaled connection models were fabricated, corresponding to two column-limb lengths. Quasi-static tests were performed on these models along two directions respectively, from which the deformation and failure characteristics, hysteretic seismic performance, and movement patterns of the connections were obtained. The results indicate that the connections primarily exhibit compression deformation perpendicular to the grain of zhutoufang pubanfang and chutoumu, as well as shear deformation perpendicular to the grain of anxiao. For the models with long column-limbs, both the horizontal bearing capacity and the lateral stiffness under large displacements are higher than those of the short column-limb models. Additionally, the horizontal bearing capacity and lateral stiffness of the connections are greater in the width direction than in the depth direction, and the overall integrity of the fork-column and dou-gong assembly in the long column-limb models is superior to that in the short column-limb models. Three-dimensional finite element (FE) models were established in ABAQUS to simulate the experimental process, and the simulation results show good consistency with the experimental data. Based on these findings, the restoring force models of the connections were established considering the parallel-to-grain compressive strength of wood and the friction coefficient. The research results can provide theoretical and technical support for the structural analysis of Yingxian Wooden Pagoda.

     

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