陈凌秀,祁皑,蔡储旺,颜学渊.考虑节点板刚度的屈曲约束 支撑核心段应变的理论及试验研究[J].湖南大学学报:自然科学版,2019,(11):43~49
考虑节点板刚度的屈曲约束 支撑核心段应变的理论及试验研究
Theoretical and Experimental Investigation on Core Steel Strain of Buckling-restrained Braces Considering Stiffness of BRB-gusset Plate
  
DOI:
中文关键词:  屈曲约束支撑  节点板刚度  应变  试验  有限元分析
英文关键词:buckling-restrained braces  stiffness of BRB-gust plate  strains  experiments  finite element analysis
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作者单位
陈凌秀,祁皑,蔡储旺,颜学渊 (福州大学 土木工程学院福建 福州 350108) 
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中文摘要:
      建立了考虑框架节点板刚度的支撑核心段应变表达式,以提高屈曲约束支撑核心段应变计算的精度,确保支撑按照预设的方案屈服. 通过解析法推导了焊接连接节点板的刚度表达式,再利用框架层间位移与支撑轴向变形几何关系,建立考虑节点板刚度的核心段应变表达式;随后通过足尺屈曲约束支撑框架的拟静力试验和框架实体有限元分析验证所提公式的准确性;所提公式、试验和有限元三者结果吻合较好. 误差分析表明,公式用于计算支撑屈服时的层间位移角可以减少60%以上的误差,并可用于支撑核心构件的优化设计.
英文摘要:
      In order to improve the calculation accuracy of core steel strain, a formula for the core strain of buckling-restrained braces(BRBS) addressing the stiffness of BRB-gust plate was proposed so as to ensure BRBS yielded as designed. The stiffness of the welded joint plate is firstly derived, and the core strain formula considering the stiffness of the gust plate is subsequently established by using the geometric relationship between the frame and BRB. The pseudo-static test of the full-scale buckling-restrained brace frame and finite element analysis were conducted to verify the accuracy of the formula. The results from the formula,experiments, and finite element analysis are all in good agreement, and 60% of accuracy improvement can be achieved when calculating the story drift at the time of BRBS yielding, which demonstrates that the proposed strain formula is applicable to the optimization design for the core steel of BRBS.
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