圆钢管超高强混凝土应力-应变关系研究

Study on Stress-Strain Relationship of Super High-Strength Concrete Filled in Circular Steel Tube

关键词:  圆钢管,超高强混凝土,应力-应变关系

Key words:  circular steel tube,super high-strength concrete,stress-strain relationship

摘要:

在40根圆钢管超高强混凝土短柱轴压试验研究的基础上,将钢管超高强混凝土视为一新型组合材料,建立其应力-应变关系曲线的理论特征参数(极限强度、平台强度以及峰值应变)计算方法.通过比较发现,现有钢管混凝土的相应计算公式不适用于圆钢管超高强混凝土.最后,推导建立了圆钢管超高强混凝土短柱轴压应力-应变关系的三段式曲线方程,并验证了该方程理论曲线与试验曲线吻合良好.

Abstract:

Based on axial compression test of 40 super high-strength concrete filled in circular steel tube,super high-strength concrete with circular steel tube as a composite material was studied.The calculation formulas for theoretical parameters(ultimate strength,plateau strength and peak strain) for super high-strength concrete with circular steel tube are establishad.Through comparing,it is pointed out that the existing calculation formula does not fit to the super high-strength concrete with circular steel tube.A tri-curve equation for stress-strain curves of the super high-strength concrete with circular steel tube is presented and it is in good agreement with the curve obtained from measurements.