木结构榫卯节点抗震性能研究进展

RESEARCH PROGRESS ON SEISMIC PERFORMANCE OF MORTISE-AND-TENON JOINTS IN TIMBER STRUCTURES

榫卯节点具有典型的半刚性连接特性,榫卯节点的抗震特性则决定着整体结构的稳定性。文中从榫卯节点滞回曲线和拟合恢复力模型两个方面,对榫卯节点的性能研究现状进行了梳理。在榫卯节点滞回曲线方面,阐述了直榫和燕尾榫受力特点与破坏特征,并基于低周反复荷载试验得出滞回曲线总体呈“Z”字形,有明显“捏拢”效应。在拟合恢复力模型方面,归纳了榫卯节点在加载过程中的趋势,并介绍了四参数幂函数模型,此模型可以反应不同尺寸的榫卯连接下连接刚度的变化规律,能够更准确的反应构件在地震反应中的结构抗震性能。通过对榫卯节点性能的研究成果回顾,发现目前没有形成统一的榫卯节点抗震性能计算方法、对于残损榫卯节点无法实现100%还原等问题。

Mortise-and-tenon joints exhibit typical semi-rigid connection characteristics,which are crucial for the seismic performance of the overall structure.This review summarizes the current research on mortise-and-tenon joints from two perspectives:hysteresis curves and fitted restoring force models.Regarding hysteresis curves,it discusses the load characteristics and failure modes of both straight and dovetail joints,noting that the hysteresis curves generally display a'Z'-shaped pattern with a distinct'pinching'effect based on low-cycle repeated load tests.In terms of restoring force models,it summarizes the trends observed during loading and introduces the four-parameter power function model.This model effectively captures the variation in joint stiffness for different joint sizes and provides a more accurate representation of structural seismic performance.The review reveals that a unified calculation method for the seismic performance of mortise-and-tenon joints is lacking,and challenges remain in achieving 100%restoration of damaged joints.