描述结构动力卸载刚度的指标验证

Analysis and Experiment of New Indices to Describe Dynamic Unloading Rigidity of Concrete Structure

提出可用于描述结构动力卸载刚度修正系数和能量变换关系系数,建立卸载过程的弹性变形能及卸载刚度表达式,并用钢骨混凝土柱恢复力试验数据对结论进行可行性验证.研究结果表明:对于在评价结构弹塑性时程分析中引入结构卸载刚度修正系数和能量变换关系系数,可以定量评价结构动力卸载,较好地解释卸载时,结构卸载刚度矩阵随时间变化构成的时变参数系统;弥补结构弹塑性时程分析中未考虑的卸载刚度与运动状态的相互影响效应,解决结构切线刚度和割线刚度表示的动力方程不等效的问题.

Unloading stiffness coefficient and energy were presented. The expression of elastic deformation correlation coefficient to describe unloading stiffness of structure energy due to damage during unloading process was established, which was validated by the experimental data of steel reinforce concrete columns. In elastic-plastic time history analysis of concrete structure, the introduction of unloading stiffness coefficient and energy correlation coefficient is conducive to evaluate quantitively the dynamic unloading, to make up the deficiency without considerring the interacting effects between unloading stiffness and motion state, to solve the disequilibrium of dynamic equation between the tangent stiffness and secant stiffness.