再生混凝土梁抗弯刚度的退化规律

Degradation law of bending stiffness of recycled concrete beams

首先理论推导黏结性能退化前后再生混凝土梁抗弯刚度的计算方法,在此基础上提出了简化计算方法,然后用试验结果对此方法的准确性进行验证,最后对再生混凝土抗弯刚度的退化规律进行了研究分析。结果表明,按提出的方法计算得到的刚度值与试验得到的刚度值很接近,且基本上偏于安全的一侧。提出的方法能较好地反应黏结性能退化后钢筋应变不再符合平截面假定,梁抗弯刚度的降低经历了先慢-后快-再慢等客观情况。

Firstly,the theoretical calculation method of bending stiffness of recycled concrete beams was established.On this basis the simple calculation method was concluded,and then its accuracy was tested by experimental results.Finally,the degradation law of bending stiffness of recycled concrete beams was studied.The results showed that the calculated results by using the method presented were satisfactory with the corresponding test results and basically inclined to the side of safety.This method could respond to the actual situation that the plane section no longer remains plane after degradation of bond performance and that the degradation of beam bending stiffness went through a process of slow-fast-slow.