论文部分内容阅读
基于混凝土构件协调扭转破坏时相邻构件的作用,建立受扭构件破坏的力学模型。运用突变理论对协调扭转破坏的机理进行分析,揭示了混凝土构件协调扭转破坏过程,并给出了构件脆性破坏的临界条件。研究表明:混凝土构件协调扭转的临界条件是由加载系统刚度与受扭构件本构曲线的软化段斜率绝对值的比值K确定,K<1时,受扭构件将发生脆性破坏。对于少筋和超筋构件脆性破坏机理是由于其本构曲线峰值强度后软化段部分斜率较陡,加载系统释放的弹性能超过构件所能耗散的能量所造成的。
Based on the action of adjacent members when the concrete members coordinate the torsional failure, the mechanical model of the torsional members is established. Using catastrophe theory to analyze the mechanism of coordinated torsional failure, the process of coordinated torsional failure of concrete members is revealed, and the critical condition of brittle failure of members is given. The results show that the critical condition for the coordinated torsion of concrete members is determined by the ratio K of the absolute value of the slope of the softened section of the constitutive curve of the loaded system and the stiffness of the loaded system. When K <1, the brittle failure of the torsional members will occur. The brittle failure mechanism of the less-tendon and the over-tendon members is due to the steep slope of the softened part after the peak strength of the constitutive curve, and the elastic energy released by the loading system exceeds the energy dissipated by the member.