新型黏弹性阻尼器增强穿斗木结构实验研究

Experimental Study on the Reinforced Chuan-Dou-style Wooden Structure of the New Viscoelastic Damper

为研究自主研发的新型黏弹性阻尼器加固村镇传统木结构的抗震性能,本文基于云南“一颗印”穿斗式木构架做法,制作了两榀足尺穿斗式木构架作为模型,其中一榀为穿斗木结构纵向木构架,另一榀为穿斗木结构横向木构架,依次对两榀木构架进行低周往复试验。研究模型结构的滞回性能、骨架曲线、刚度退化、耗能性能和拔榫量的对比分析。结果表明:未加固木构架的滞回曲线呈明显反“Z”形,加固木构架的滞回曲线更饱满;新型黏弹性阻尼器成功地弥补了原始缺陷,提升了木构架的初始刚度;对比未加固木构架,加固后的纵向木构架的最大拔榫量降低了68.5%,横向木构架的最大拔榫量降低了81.25%。说明新型黏弹性阻尼器能够抑制节点拔榫破坏,提升木构架的抗侧刚度和耗能能力。

To study the seismic performance of self-developed new viscoelastic dampers for reinforcing traditional tim-ber structures in rural villages,two full-scale Chuan-Dou-style wooden frames were made as models based on the Yunnan"One Seal".One frame was a longitudinal timber frame,and the other was a transverse timber frame.Cyclic loading tests were conducted on the timber frames.The hysteretic behavior,skeleton curves,stiffness degradation,en-ergy dissipation capacity,and dovetail slippage of the model structures were compared and analyzed.The results showed that the hysteresis curves of the unreinforced specimens exhibited obvious reverse"Z"shapes,while the hyster-esis curves of the reinforced specimens were fuller.The new viscoelastic dampers compensated for the defects of the orig-inal structures and increased the initial stiffness.Compared to the unreinforced,the maximum slippage of the reinforced longitudinal frame decreased by 68.5%,and that of the transverse frame decreased by 81.25%.The new viscoelastic dampers can inhibit mortise and tenon nodes connection failure,enhance the lateral stiffness and energy dissipation ca-pacity of the timber frames.