FRP加固SRC构件抗弯承载力计算方法

Calculation Method for Flexural Bearing Capacity of SRC Beams Strengthened with FRP

目的提出FRP(纤维增强复合材料)加固SRC(钢骨混凝土)受弯构件抗弯承载力简化计算公式.方法采用极限平衡理论分析了FRP加固SRC受弯构件的受力过程,探讨FRP加固后构件正截面的破坏特征、受力特点及其影响因素,将FRP的面积转化为等效受拉钢筋的面积.结果根据中和轴与钢骨的截面位置不同,采用实用叠加法研究并推导出了一组更为精确和合理的抗弯承载力简化计算公式.结论基于平截面假定,FRP的应变略大于钢筋的应变,简化计算方法克服了简单叠加法和一般叠加法在计算上的明显缺陷且偏于安全.

To solve the problem of SRC（Steel Reinforced Concrete） beam strengthened with FRP（Fiber Reinforced Polymer）, a new renovated SRC beam strengthened with FRP has been brought forward. The dam- age and bearing capacity of SRC beam strengthened with FRP are studied, the reasonable formulas for calculating has been put forward. The author presents experimental studies on the behavior of RC（Reinforced Concrete） flexural members strengthened with FRP by limit balance method . The load - deformation pro- cess, flexural failure characteristics and effect of various parameters on their behaviors are discussed. The area of FRP are converted into equivalent area of steel. Based on the different position of middle axle and steel, a set of more accurate and reasonable formulas for calculating normal section bearing capacity of SRC beams is derived by practical superposition method, because the strain of FRP is bigger than the strain of steel. This simple calculation method is safe. This method avoids the obvious defect of simple superposition method and general superposition method on calculation method.