胶合木梁-柱摩擦型节点滞回性能研究  

Hysteretic performance of frictional glulam beam-to-column connections

作　　者：吴亚杰 谢启芳[1,2] 张毅 胡方正 杨会峰 WU Yajie;XIE Qifang;ZHANG Yi;HU Fangzheng;YANG Huifeng(School of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education(XAUAT),Xi’an 710055,China;College of Civil Engineering,Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055 [3]南京工业大学土木工程学院,江苏南京211816

出　　处：《建筑结构学报》2022年第8期65-75,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(51878550);陕西省自然科学基础研究计划(2021JC-44)。

摘　　要：将摩擦型连接和形状记忆合金(SMA)板引入重型胶合木结构,提出了胶合木梁-柱摩擦型节点并研究了其滞回性能。分别以钢材和木材作为摩擦板材料,设计并制作了3个1∶2缩尺节点,开展了水平低周反复加载试验,获取了节点的典型破损模式和弯矩-转角滞回曲线,对比了节点的弹性转动刚度、峰值弯矩、耗能能力和残余变形。基于胶合木梁-柱摩擦型节点的工作机理建立了节点弯矩-转角滞回模型。结果表明:摩擦型节点主要发生SMA板受拉断裂,节点连接区域木材基本保持完好。相比普通螺栓钢填板节点,摩擦型节点的弹性转动刚度基本保持不变,峰值弯矩下降2%~17%,但各级位移加载幅值下节点耗能增加64%~278%,等效黏滞阻尼系数基本大于0.2,残余变形减小。采用钢制摩擦板的摩擦型节点残余变形更小,采用木质摩擦板的摩擦型节点的等效黏滞阻尼系数较大。胶合木梁-柱摩擦型节点的弯矩-转角滞回模型与试验滞回曲线吻合良好,表明其可用于工程结构分析。By introducing shape memory alloy(SMA) strips and frictional connection into heavy glulam timber structures, the frictional glulam beam-to-column connections were proposed and their hysteretic performance was investigated. With steel and timber as frictional pad materials, a total of three half-scale specimens were designed and fabricated. Low cyclic reserved loading tests were conducted to obtain typical damage and failure modes and hysteretic curves. The elastic rotational stiffness, peak moments, energy dissipation capacities and residual deformations of the specimens were compared. Based on the working mechanism of the proposed connections, a hysteretic model was proposed. The results show that SMA strips undergo tensile failure while the timber in connection zone mainly remains intact. Compared to those of conventional bolted connections with slotted-in steel plates, the elastic rotational stiffness of frictional connections does not significantly change, the peak moments decrease by 2% to 17%, but the energy dissipation under each loading cycle increases by 64%-278%. The equivalent viscous damping ratios for most loading cycles are more than 0.2, and the residual deformation decreases. Frictional connection with steel pads has relative smaller residual deformation, and frictional connection with timber pads has greater equivalent viscous damping ratios. The proposed hysteretic model captures the experimental curves well, indicating that the model could be further utilized in engineering structural analysis.

关 键 词：重型胶合木结构 摩擦型节点 SMA板 水平低周反复加载试验 滞回性能 滞回模型 

分 类 号：TU366.303[建筑科学—结构工程]