SEISMIC BEHAVIOR OF CFST COLUMN TO BEAM JOINT WITHOUT WELDING IN CONSTRUCTION FIELD:THEORETICAL STUDY
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摘要: 通过分析无焊接钢筋混凝土梁-钢管混凝土柱节点的受力特点以及失效模式,提出了三段式骨架曲线理论模型。对于弹性阶段,通过求解刚度矩阵方法获得节点骨架曲线的初始刚度;对于完全塑性阶段以及强度退化阶段,采用极限平衡方法获得节点的极限强度以及下降段刚度。为了进一步验证骨架曲线模型的正确性,将理论计算结果与有限元分析结果进行对比,说明三段式骨架曲线模型可以较好地描述节点的受力特性及承载能力变化趋势。Abstract: By means of analyzing the mechanical characteristics and failure model of RC beam to CFST column joint without welding, a three-stage skeleton curve model is presented.In the elastic stage, the initial stiffness is evaluated by solving the stiffness matrix.In the perfect plastic stage and strength degradation stage, the ultimate strength and the degradation stiffness of the joint can be obtained with the limit equilibrium method.In order to verify the theoretical model presented above, finite element analysis results are compared with the theoretical results.It is suggested that the three-stage skeleton curve model can be used to depict the mechanical behavior of this new type of joint.
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Key words:
- CFST column to beam joint /
- seismic behavior /
- skeleton curve /
- RC beam /
- theoretical model
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[2] 李国强,刘玉姝,赵欣.钢结构框架体系高等分析与系统可靠度设计[M].北京:中国建筑工业出版社,2006. 于航,查晓雄.现场施工完全无焊接钢管混凝土节点抗震性能研究试验与有限元分析[J].工业建筑,2011,41(6):15-19. [3] 徐秉业,刘信声.应用弹塑性力学[M].北京:清华大学出版社,1995.
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