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.