混凝土构件协调扭转破坏机理的突变理论分析
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摘要
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 interaction of contact element in Failure of Concrete Members Coordinated Torsion,mechanical model for the torsion member failure was established.Catastrophe theory was used to analyze the mechanism of coordinated torsion failure.Failure process of concrete members coordinated torsion was revealed and a critical condition where the concrete members was damaged brittlely.The result shows that: The critical condition is given by the ratio,K,of loading system stiffness to(the absolute value of) softening slope of torsion member constitutive curve,torsion member damage brittlely when K<1.The mechanism of torsion member brittle damage to few or more steel is due to that the constitutive curve after peak value intensity is steeper and the elastic energy released by loading system is more than the energy dissipated by torsion moment accordingly.
Based on the interaction of contact element in Failure of Concrete Members Coordinated Torsion,mechanical model for the torsion member failure was established.Catastrophe theory was used to analyze the mechanism of coordinated torsion failure.Failure process of concrete members coordinated torsion was revealed and a critical condition where the concrete members was damaged brittlely.The result shows that: The critical condition is given by the ratio,K,of loading system stiffness to(the absolute value of) softening slope of torsion member constitutive curve,torsion member damage brittlely when K<1.The mechanism of torsion member brittle damage to few or more steel is due to that the constitutive curve after peak value intensity is steeper and the elastic energy released by loading system is more than the energy dissipated by torsion moment accordingly.
引文
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[6]潘岳,王志强,张勇.突变理论在岩体系统动力失稳中的应用[M].北京:科学出版社,2008.
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