程倩倩, 苏明周, 连鸣. 带可更换剪切型耗能梁段高强钢组合框筒的结构影响系数研究[J]. 工程力学, 2020, 37(2): 145-158. DOI: 10.6052/j.issn.1000-4750.2019.01.0127
引用本文: 程倩倩, 苏明周, 连鸣. 带可更换剪切型耗能梁段高强钢组合框筒的结构影响系数研究[J]. 工程力学, 2020, 37(2): 145-158. DOI: 10.6052/j.issn.1000-4750.2019.01.0127
CHENG Qian-qian, SU Ming-zhou, LIAN Ming. RESPONSE MODIFICATION FACTOR OF HIGH STRENGTH STEEL FABRICATED FRAMED-TUBE WITH REPLACEABLE SHEAR LINKS[J]. Engineering Mechanics, 2020, 37(2): 145-158. DOI: 10.6052/j.issn.1000-4750.2019.01.0127
Citation: CHENG Qian-qian, SU Ming-zhou, LIAN Ming. RESPONSE MODIFICATION FACTOR OF HIGH STRENGTH STEEL FABRICATED FRAMED-TUBE WITH REPLACEABLE SHEAR LINKS[J]. Engineering Mechanics, 2020, 37(2): 145-158. DOI: 10.6052/j.issn.1000-4750.2019.01.0127

带可更换剪切型耗能梁段高强钢组合框筒的结构影响系数研究

RESPONSE MODIFICATION FACTOR OF HIGH STRENGTH STEEL FABRICATED FRAMED-TUBE WITH REPLACEABLE SHEAR LINKS

  • 摘要: 针对传统钢框筒结构耗能能力差和震后修复困难的问题,提出了一种新型钢框筒结构体系-带可更换剪切型耗能梁段的高强钢组合框筒结构(HSS-SFT)。为研究HSS-SFT的结构影响系数,设计了8个具有理想屈服模式的HSS-SFT结构。考虑高阶振型的影响,采用分步侧向力调整法得到结构的性能曲线,基于改进的能力谱法分析了楼层总数和耗能梁段长度对结构影响系数R和位移放大系数Cd的影响。研究结果表明: HSS-SFT在弹塑性阶段,由于内力重分布,结构呈现出较高的超强能力和延性能力;随着结构层数的增加,R呈减小趋势,Cd无显著变化规律,随着耗能梁段长度的增加,RCd略微增大;建议HSS-SFT设计地震作用下的R为3.65,结构超强系数RΩ为2.92,罕遇地震作用下的Cd为7.45,设计基底剪力可比现行抗震规范规定的小震基底剪力降低30%;HSS-SFT可以保证结构在罕遇地震作用下呈现理想的破坏模式,有效地改善传统钢框筒结构耗能能力差和震后修复困难的问题。

     

    Abstract: High strength steel fabricated framed-tube structure with replaceable shear links (HSS-SFT) was proposed to improve the poor energy dissipation capacity and replicability after earthquakes. To investigate the response modification factor of HSS-SFTs, eight HSS-SFTs with ideal yield mechanism were established. The capacity curves of HSS-SFTs were obtained by stepwise lateral force adjustment method considering the effects of high-order vibration mode. The response modification factor R and displacement amplification factor Cd were obtained based on the improved capability spectrum method. Subsequently, the effects of parameters influencing R and Cd, including the building total story number and the shear link length, were investigated. According to the analysis results, HSS-SFTs have great overstrength and good ductility due to internal force redistribution of inelastic state. The R decreased, and Cd had no significant change as the total story number increased. The R and Cd slightly increased by an increase in the shear link length. Based on the analysis results, the R, RΩ and the Cd equalled 3.65, 2.92 and 7.45 respectively and 30% elastic design earthquake action of HSS-SFTs can be approximately reduced though national seismic code. HSS-SFTs can characterize an ideal failure mode during rare earthquakes and effectively improve the poor energy dissipation and post-earthquakes repairable abilities of traditional steel frame-tube structure.

     

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