钢筋混凝土的泊松系数

Poisson ratio of reinforced concrete

文章基于接近实物尺寸的钢筋混凝土构件复合受力试验和回归分析，提出钢筋混凝土组合材料泊松系数的新概念和回归方程。钢筋混凝土组合材料泊松系数与匀质弹性材料泊松系数不同，它不是一个常数。钢筋混凝土组合材料泊松系数分为受拉泊松系数和受压泊松系数，且受拉泊松系数常为负值。受拉泊松系数回归曲线存在上升段和下降段；受压泊松系数回归曲线分为混凝土开裂前、达到峰值应力前和峰值应力后３ 个阶段。

A new concept and the regression equation of Poisson ratio are put forward for reinforced concrete based on reliable test data and regression analysis in this paper.Being different from homogeneous material,the Poisson ratio for reinforced concrete is not a constant, and it is composed of tension Poisson ratio and compression Poisson ratio. The tension Poisson ratio is negative,and its regression curve shows upward section and downward section. The regression curve of compression Poisson ratio consists of three sections——before crack of concrete, before the peak stress and after the peak stress.