二次受力碳纤维布加固钢筋混凝土梁短期刚度的计算

进行了6根碳纤维布加固钢筋混凝土梁的抗弯性能试验研究. 通过砝码杠杆加载较准确地模拟了碳纤维布加固钢筋混凝土梁的二次受力状况, 得出了碳纤维布加固梁在二次受力下的典型荷载—位移曲线. 在分析二次受力下碳纤维布加固钢筋混凝土梁截面刚度变化的基础上, 通过理论分析并结合试验统计数据, 建立了考虑二次受力碳纤维布加固钢筋混凝土矩形截面梁短期刚度的计算方法. 在对计算结果与试验数据及其他计算方法进行了对比分析后, 表明所建公式具有较好的精确度.

Formula for Calculating the Stiffness of RC Beam Strengthened with CFRP under Secondary Loading

In this paper the flexural behavior of six reinforced concrete beams strengthened by carbon fiber sheets is tested. Using the weights and lever loading system, the tests have simulated the condition of secondary load on the reinforced concrete beams strengthened by carbon fiber sheets, and obtained the typical load-displacement curve of the reinforced concrete beams. Based on analysis of the stiffness changes on the cross-section of the reinforced concrete beams, and using both theoretical and experimental statistics, this paper proposes the method of calculating the short-term stiffness on the rectangular section of the reinforced concrete beams. The accuracy is validated by comparing the experimental results with those obtained from generic calculation methods.