摘要
为了控制古建筑木结构梁柱节点在荷载作用下产生较大变形以及便于阻尼器更换,提出了旋转摩擦阻尼器。该阻尼器通过圆弧坡度摩擦面以及碟形弹簧的设置,实现阻尼器的变摩擦特性。以螺栓预紧力、摩擦面粗糙程度以及滑动齿角度为主要参数设计了5个阻尼器,开展了往复力作用下旋转摩擦阻尼器的试验研究。结果表明:阻尼器滞回曲线呈现明显的“类旗帜”形,且正负方向不对称;阻尼器力学性能稳定,有良好的耗能性能,等效黏滞阻尼系数稳定在0.09~0.19之间;阻尼器的极限弯矩、耗能能力与螺栓预紧力、摩擦面粗糙程度和滑动齿角度呈正相关。建立阻尼器有限元模型,对模型的滑动齿角度和钢板厚度进行参数分析,发现增加滑动齿角度和钢板厚度可有效提高阻尼器耗能能力,但需控制合理范围,建议滑动齿角度10°~15°,钢板厚度20~40 mm。
In order to control the excessive deformation of beam-column joints in ancient timber structures under load and facilitate damper replacement,a rotational friction damper is proposed.This damper achieves variable friction characteristics through the arrangement of arc-sloped frictional surfaces and disc springs.Five dampers were designed with bolt pre-tightening force,friction surface condition,and sliding tooth angle as the main parameters,and experimental research was conducted on rotational friction dampers under reciprocating force.The results show that the hysteresis curves of the damper exhibit a clear‘flag-like’shape with asymmetry in positive and negative directions.The dampers have stable mechanical properties and good energy dissipation performance,with the equivalent viscous damping coefficient stably ranging from 0.09 to 0.19.The ultimate bending moment and energy dissipation capacity of dampers are positively correlated with bolt preload,friction surface roughness,and sliding tooth angle.A finite element model of the damper was established,and parametric analysis was conducted on the sliding tooth angle and steel plate thickness of the model.It is found that increasing the sliding tooth angle and steel plate thickness can effectively improve the energy dissipation capacity of the damper,but it needs to be controlled within a reasonable range.It is recommended to have a sliding tooth angle of 10°-15°and a steel plate thickness of 20-40 mm.
作者
常鹏
赵荣浩
冯秋歌
杨娜
CHANG Peng;ZHAO Ronghao;FENG Qiuge;YANG Na(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing’s Key Laboratory of Structural Wind Engineering and Urban Wind Environment,Beijing Jiaotong University,Beijing 100044,China;Research Institute of Standards and Norms Ministry of Housing and Urban-Rural Development,Beijing 100044,China)
出处
《建筑结构学报》
北大核心
2025年第9期265-275,共11页
Journal of Building Structures
基金
中央高校基本科研业务费专项资金资助(2022JBZY008)
国家自然科学基金项目(51878034)
高等学校学科创新引智计划(B13002)。
关键词
旋转摩擦阻尼器
拟静力试验
耗能能力
滞回性能
数值模拟
rotational friction damper
quasi-static test
energy dissipation capacity
hysteresis performance
numerical simulation
