CFRP加固损伤混凝土梁截面短期刚度探讨分析

Discussion and Analysis of Sectional Short-term Stiffness of RC Beams Strengthened with CFRP

本文对碳纤维布加固损伤钢筋混凝土梁在完全卸载或不卸载的短期刚度进行研究,在计算短期刚度时考虑初始荷载的影响即纵向受拉钢筋存在初始应变的条件下,把不同初始荷载作用下损伤钢筋混凝土梁的短期刚度变化过程分为屈服弯矩之前和屈服弯矩至极限弯矩两个阶段。在分析碳纤维布加固损伤混凝土梁截面刚度变化规律的基础上,通过对试验资料统计分析,建立了碳纤维布加固损伤钢筋混凝土梁截面短期刚度的简化计算公式,经试验资料验证,该公式具有较高精度。

In this paper,the damages of reinforced concrete beams with CFRP in a completely unloading or unloading short-term stiffness are studied.Considering the influence of the initial load of longitudinal tensile steel under the conditions of the initial strain when calculating the short-term stiffness,the damage of reinforced concrete beams under different initial load stiffness change process is divided into two stages:before the yield moment and from yield moment to ultimate bending moment.On the basis of analyzing sectional stiffness variation of damaged reinforced concrete beams with CFRP.Through statistical analysis of test data,a simplified formula for calculating the short-term stiffness of reinforced concrete beams strengthened with CFRP sheets is established,verified by test data,results show that the formula has a higher precision.