基于竖向预应力筋检测方法的竖向预应力外露段力学模型分析

Mechanical Model Analysis of Exposed Segment of Vertical Prestressing Bar Based on Testing Method for Vertical Prestressing Bars

在视竖向预应力筋外露段为悬臂梁模型的基础上,提出竖向预应力筋平面弹性支承模型和空间弹性支承模型,弹性支承模型不仅能模拟竖向预应力筋外露段悬臂梁模型的抗弯刚度,而且能模拟纵向的弹性刚度。悬臂梁模型通过检测外露段的频率计算该模型竖向预应力筋锚固端刚度K值,结合工程试验数据,弹性支承模型K与T的变化关系与悬臂梁模型K与T的变化关系具有一致性,且弹性支承模型的计算式简单,概念明确,更有利于推广。

On the basis of considering the exposed segment of vertical prestressing bar as a cantilever beam,plane elastic support model and solar elastic support model of vertical prestressing bars are put forward.Elastic support model can simulate not only flexural rigidity of cantilever model for the exposed segment of vertical prestressing bar,but also longitudinal elastic rigidity.For cantilever beam model,K,the rigidity of vertical prestressing bar at the anchor end,is computed with the tested value of inherent frequency of exposed segment.Combined with engineering experimental data,the variation relationship between K and T is identical for elastic support model and cantilever beam model.Possessing the advantages of simple computation and brief concept,elastic support model is more convenient to be popularized.