| 引用本文: | 贾明明,李江红,陈寅圳,唐贞云.摇摆结构体系框架柱脚BRSP耗能机制分析[J].哈尔滨工业大学学报,2022,54(5):1.DOI:10.11918/202103103 |
| JIA Mingming,LI Jianghong,CHEN Yinzhen,TANG Zhenyun.Energy-dissipation mechanism of BRSPs in column bases of rocking structures[J].Journal of Harbin Institute of Technology,2022,54(5):1.DOI:10.11918/202103103 |
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| 摇摆结构体系框架柱脚BRSP耗能机制分析 |
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贾明明1,2,3,李江红3,陈寅圳3,唐贞云4
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(1.结构工程灾变与控制教育部重点实验室(哈尔滨工业大学),哈尔滨 150090; 2.土木工程智能防灾减灾工业和信息化部重点实验室(哈尔滨工业大学),哈尔滨 150090; 3.哈尔滨工业大学土木工程学院,哈尔滨 150090;4.城市与工程安全减灾教育部重点实验室(北京工业大学),北京 100124)
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| 摘要: |
| 钢框架结构的底层刚性连接柱脚节点在地震时内力大,容易发生损伤破坏,摇摆结构体系中需改变框架柱脚的构造形式以改善结构体系的失效模式并提高结构性能。本文提出一种可抬升的半刚性框架柱脚,设置屈曲约束钢板（buckling restraint steel plate,BRSP）以耗散能量,分别从BRSP与框架柱翼缘的厚度比α、宽度比β和轴向刚度比ω 3个方面分析柱脚的滞回性能,并与传统刚接柱脚进行对比。结果表明:随着α和β的增大,构件耗能能力和结构抗侧刚度不断增大,且能较好地减少柱脚的塑性损伤。当α取0.85、β取0.50且ω在[0.3,0.5]范围内时,结构性能最优。BRSP的塑性耗能占总体塑性耗能的比值在80%以上,柱脚的损伤可集中控制在可替换的BRSP内。通过对BRSP与垫板、盖板以及地梁的接触分析表明,盖板不仅能够有效防止BRSP的面外屈曲,还能提供总耗能7%的摩擦耗能量。本文提出的框架柱脚形式具有良好的耗能能力,可以提高结构的抗震性能和可恢复性。 |
| 关键词: 摇摆结构 柱脚节点 屈曲约束钢板 耗能机制 可恢复性能 |
| DOI：10.11918/202103103 |
| 分类号:TU311.4 |
| 文献标识码:A |
| 基金项目:北京工业大学城市与工程安全减灾教育部重点实验室开放课题(201907)；国家自然科学基金(51978220)；中国地震局工程力学研究所基本科研业务费(2018D04) |
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| Energy-dissipation mechanism of BRSPs in column bases of rocking structures |
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JIA Mingming1,2,3,LI Jianghong3,CHEN Yinzhen3,TANG Zhenyun4
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(1.Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology), Ministry of Education, Harbin 150090, China; 2. Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters (Harbin Institute of Technology), Ministry of Industry and Information Technology, Harbin 150090, China; 3. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China; 4. Key Laboratory of Urban Security and Disaster Engineering (Beijing University of Technology), Ministry of Education, Beijing 100124, China)
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| Abstract: |
| The internal force of rigid column base joints of steel frames is very large under earthquakes, making it prone to be damaged and destroyed, so the configurations of column bases of rocking structures should be optimized to improve the failure modes and structural performance. Lifting semi-rigid frame column base joints with buckling restraint steel plates (BRSPs) were proposed for seismic energy dissipation. The hysteretic behaviors of column base joints with BRSPs were analyzed based on three parameters: thickness ratio α, width ratio β, and axial stiffness ratio ω between BRSP and column flange, and the results were compared with those of traditional rigid column base joints. Results show that the energy dissipation capacity of BRSPs and lateral resistance of structures were improved with the increase in α and β, and the plastic damage of column bases was reduced. The structural performance was optimal under the conditions that α=0.85, β=0.50, and ω was in the range of [0.3,0.5]. The ratio of plastic dissipated energy of BRSPs to the total plastic dissipated energy was more than 80%, and the plastic damage was limited to the replaceable BRSPs. Contact analysis between BRSP, backing plate, cover plate, and base beam was conducted, and it was found that the cover plate could not only effectively restrain the out-plane buckling of the BRSPs, but also provide friction energy dissipation, 7% of the total dissipated energy. The proposed column base has great energy dissipation capacity, which can improve the seismic performance and resilience of structures. |
| Key words: rocking structure column base joint buckling restraint steel plate energy-dissipation mechanism resilience |
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