摘要
为开发轻质高效的结构耗能阻尼器并将其应用于空间结构振动控制,利用国产铝合金作为防屈曲耗能支撑的核芯材料,并对研制的6个支撑试件进行了拟静力试验。按照稳定理论设计的试件在试验中未发生整体失稳,铝芯板与约束钢管间预留一定间隙并填充锂基润滑脂以消除套箍效应和减小界面摩擦。试验结果显示:支撑在受拉和受压时都能屈服而不屈曲,铝芯板应变强化现象明显,滞回曲线稳定饱满,有较高的耗能能力,其拉压峰值不均匀系数不超过1.3。基于Chaboche钢材循环塑性本构模型,通过试验数据对相关铝材模型参数进行了标定,并将其应用于防屈曲支撑的有限元分析,计算结果与试验曲线吻合良好,相关模型参数能够进一步应用于结构抗震弹塑性分析。
For developing a new type of lightweight dampers which apply to vibration control of spatial structures,six innovative buckling-restrained braces（ BRBs） were fabricated with Chinese aluminium alloy,and a series of quasistatic tests were conducted to address the energy dissipation behavior of the aluminum alloy BRBs（ ALBRBs）. All of specimens were designed with the stability theory of BRB member,resulting in that stable hysteretic loops were obtained without overall buckling occurrence. The brace member was sandwiched by the restraining members and small gaps in between,which was filled with lithium lubricating grease to reduce the friction and hooping effect. The experimental results show that the ALBRBs always can yield without buckling both in compression and tension,the strain hardening of aluminium alloy core is very obvious and the hysteretic loops are very full and stable,thus the energy dissipation capacity is good. The non-uniformity factor between peak pressure and peak tension is no more than1. 3. Based on the Chaboche plastic constitutive model for steel, the material parameters of aluminium alloy constitutive model were obtained from experimental data which can be used for finite element analysis. The results of finite element analysis are similar to the results of the experiment. It is expected that the model parameters can be further developed for calculating the response of structures under earthquake.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2015年第8期49-57,共9页
Journal of Building Structures
基金
国家科技支撑计划(2013BAJ10B10)
上海市科委"上海建筑空间结构工程技术研究中心"(14DZ2252300)
关键词
屈曲约束支撑
铝合金芯板
拟静力试验
有限元分析
滞回性能
耗能能力
本构模型
buckling restrained brace
aluminium alloy core
quasi-static test
finite element analysis
hysteretic behavior
energy dissipation
constitutive model
