新型耗能连接正交胶合木剪力墙抗侧力性能试验

Experimental Study on Lateral Resistance of Cross-Laminated Timber Shear Walls with Innovative Energy-Dissipating Connections

摘要:

为研究基于软钢屈服与橡胶剪切变形双重耗能机制新型连接的正交胶合木剪力墙抗侧力性能，考虑顶部竖向荷载、墙体高宽比、耗能连接件可更换性等因素，对6榀2.4m高足尺试件进行了单调及低周往复加载试验，并与普通金属连接正交胶合木墙体进行对比试验，获取并分析了剪力墙的破坏过程、力学性能参数及各项因素对抗侧力性能的影响规律。结果表明：新型耗能连接正交胶合木剪力墙在侧向力下的损伤主要集中在耗能连接的软钢耗能段屈服断裂与耗能橡胶脱胶破坏，墙体板材与自攻螺钉未见损伤；增大顶部竖向荷载可有效提升墙体的抗侧力性能，而增大高宽比主要可增加墙体的变形能力与延性；与普通金属连接墙体相比，耗能连接墙体的最大承载力相近，但延性提升26%，耗能能力提升38%，最大层间位移角可达1/23，且在原位替换耗能连接修复的墙体与原墙体的抗侧力性能相近，表明新型耗能连接正交胶合木剪力墙具有较好抗震性能，可实现强震后连接可更换、结构可修复的设计目标。

Abstract:

To investigate the lateral performance of the cross-laminated timber （CLT） shear walls connected by innovative energy-dissipating connections with a mechanism of “yielding of soft steel” and “shear deformation of rubber”， a series of monotonic and reversed cyclic loading tests were conducted on six full-scale specimens with a height of 2.4 meters， considering various factors including vertical load distributions， aspect ratios， and replaceability of the energy-dissipating connections. A comparative test was also conducted on a CLT wall specimen with common metal connections. The failure process， mechanical properties， and the influence of preset factors were obtained and analyzed. The results indicate that the damage of the CLT walls with the innovative energy-dissipating connections mainly concentrates on the dissipative connections with yielding fracture of the soft-steel dissipative sections and debonding failure of the rubber， preventing the CLT panels and screws from damage. The increase of the vertical load effectively enhances the lateral resistance performance of the wall， while the increase of aspect ratio mainly improves the deformation capacity and ductility of the wall. Compared with the wall with common metal connections， the load-carrying capacity of the wall with energy-dissipating connections is similar， but its ductility increases by 26%， energy dissipation capability increases by 38%， and the maximum inter-story drift can reach 1/23. Moreover， the lateral performance of the wall repaired by the in-situ replacement of the energy-dissipating connections is similar to that of the original wall. The results indicate that the CLT shear walls connected by innovative energy-dissipating connections exhibits an excellent seismic performance， which can achieve the design objective of replaceable connections and repairable structures after a strong earthquake.