摘要
为研究大空间混凝土(LRC)框架结构消能减震加固效果及其抗震性能,基于已完成的1∶6缩尺无控LRC框架结构模型试验,开展同加载历程下另一设置黏滞阻尼器(VFD)的相同减震框架结构模型振动台试验。通过对比分析两个模型破损特征、动力性能、加速度与位移响应等,定量获取增设VFD后减震结构相比无控结构抗震性能的提升水平,揭示不同地震作用下LRC框架中VFD发挥的实时减震效果,重点研究减震加固技术对LRC框架结构中薄弱部位响应的影响规律。试验结果表明:减震模型较非减震模型层间位移得到有效控制,罕遇地震作用下结构最大层间位移角由1/102降至1/194;试验过程中阻尼器的工作性能良好,随着地震激励升高,黏滞阻尼器出力逐渐增大,阻尼器实际最大出力达设计极限值的88%。
To assess the reinforcement effect and seismic performance of large-space reinforced concrete(LRC) frame structures with a passive energy dissipation system, a shaking table test of 1∶6 scaled LRC retrofitted by viscous fluid dampers(VFDs) was carried out in the same loading system based on another finished test of the identical LRC frame model. By comparing the damage patterns, dynamic performance, acceleration and displacement responses, the improved level of seismic performance of retrofitted LRC with VFDs was quantitatively obtained, and the real-time energy dissipation effect under different seismic excitation intensities was revealed. The dynamic responses in the soft layer in retrofitted LRC were mainly studied. As shown from the tests results, the deformation of the controlled model is smaller than the uncontrolled one. The maximum story drift decreases from 1/102 to 1/194 in a rare earthquake. VFDs work well in the test. With the growth of seismic fortification intensity, the force of the VFDs becomes increasingly bigger. The actual maximum force of the VFDs reaches 88% of the ultimate design force.
作者
信任
张强
黄炜
毕登山
XIN Ren;ZHANG Qiang;HUANG Wei;BI Dengshan(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Central Research Institute of Building and Construction Co.,Ltd,MCC Group,Beijing 100088,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2023年第3期20-29,共10页
Journal of Building Structures
基金
国家自然科学基金项目(51978562)
陕西省教育厅科研计划项目-服务地方专项项目(19JC024)。
关键词
大空间混凝土框架
黏滞阻尼器加固
振动台试验
消能减震
软弱层
抗震性能
large-space RC frame
viscous damper reinforcement
shaking table test
energy dissipation
soft layer
seismic performance
