木质变摩擦阻尼器滞回性能的试验研究与理论分析

基于对摩擦阻尼器材料及构造的改进，研制了一种木质变摩擦阻尼器。对9个不同参数的木质变摩擦阻尼器试件进行了低周反复荷载试验，研究了阻尼器的滞回性能，分析了摩擦块的坡度、螺栓预紧力等因素对阻尼器耗能性能的影响。根据木质变摩擦阻尼器的构造特点及工作原理，建立了其力学分析模型，确定了适用于该摩擦阻尼器的滞回规则和相应的滞回模型，并利用试验数据对滞回模型进行了验证。研究结果表明：木质变摩擦阻尼器的输出力在大变形时显著提升，滞回曲线较为饱满，具有分阶段耗能的特点，表现出稳定且良好的耗能性能；木质变摩擦阻尼器的耗能能力与木质摩擦块坡度和螺栓预紧力呈正相关。建立的滞回模型能较准确地反映木质变摩擦阻尼器的工作性能，理论与试验滞回曲线吻合较好。

Experimental study and theoretical analysis on hysteretic #br# performance of wooden variable friction damper

Based on the improvement of friction damper’s material and construction, a kind of wooden variable friction damper was invented in this paper. Low-cyclic reversed loading tests on 9 wooden variable friction dampers with different parameters were performed. The hysteretic performance of the damper were obtained. The influence of the slope of friction block and bolt preload on the energy dissipation capacity of the damper was analyzed, respectively. The hysteretic rules and corresponding hysteretic model were determined according to the mechanical mechanism of damper, and the hysteretic model was verified by experimental data. The results show that output force of the wooden variable friction dampers is significantly improved in large deformation, and the hysteretic curve is fuller, having the characteristics of energy dissipation in stages and showing stable and good energy dissipation capacity. The energy dissipation capacity of wooden variable friction damper is positively correlated with slope of wooden friction block as well as bolt preload. The hysteretic model developed can accurately reflect the performance of wooden variable friction damper and a good agreement on hysteretic curves between the experiment and theory can be found.