摘要
提出可装配的自复位耗能（SCED）支撑,该支撑由中心杆、导向杆、碟形弹簧、限位板、弹簧承压板及摩擦片组成。介绍了支撑各阶段工作原理,建立了支撑刚度的计算方法。对自复位耗能支撑进行低周往复加载试验,研究其滞回特性、残余变形、耗能能力及各阶段刚度变化,并建立有限元模型进行对比分析。结果表明,所建立的支撑刚度计算方法正确可行,计算所得刚度与模拟值之差在8%以内。SCED支撑滞回曲线呈旗形,各阶段刚度过渡平缓,支撑耗能能力强,残余变形随预压力的增加而减小,当支撑预压力大于最大静摩擦力,最大残余变形为最大加载位移的5.1%。有限元分析滞回曲线与试验结果吻合,其累积耗能与试验结果相差小于10%,残余变形与试验结果基本接近,说明该模型可有效反映支撑的工作原理与滞回性能。
A novel assembled serf-centering energy dissipation （SCED） brace is proposed, which is composed ot center bar, guiding rod, disc springs, limit plate, bearing plate and friction plate. The working principles of the brace at different stages are introduced, and the stiffness calculation method is established. A series of low cyclic reversed loading tests of SCED brace were carried out to examine the hysteretie characteristics, residual deformation, energy dissipation ability and stiffness at different stages. A finite element model was buih for comparative analysis. Results indicate that the stiffness calculation method is feasible and correct, and the difference between the calculated stiffness and the simulated value is less than 8%. The SCED brace exhibits flag-shaped hysteretic responses, and the stiffness transition is smooth among various stages. This brace shows favorable energy dissipation ability and its residual deformation decreases with the increase of the pre-press force. When the pre-press force is larger than the friction force, the maximum residual deformation is 5.1% of the maximum loading displacement. The hysteretic curve of the finite element model agrees well with the experimental result. The difference in energy dissipation between this model and test result is less than 10%. The residual displacement and test results are basically close, which demonstrates that this finite element model can effectively reflect the working principle of brace and its hysteretie performance.
作者
徐龙河
要世乾
XU Longhe;YAO Shiqian(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2018年第11期158-165,共8页
Journal of Building Structures
基金
国家自然科学基金项目(51578058)
北京市自然科学基金项目(8172038)
关键词
自复位耗能支撑
装配式
低周往复荷载试验
滞回性能
刚度
self-centering energy dissipation brace
assembly
low cyclic reversed loading test
hysteretic performance
stiffness
