加筋高性能砂浆加固RC梁抗弯性能及承载力计算

为统一中国对加筋高性能砂浆加固RC梁抗弯性能的认识，以中国学者所做95根加筋高性能砂浆加固的钢筋混凝土梁抗弯性能试验研究为基础，分析加固粱的受力性能和破坏机理，在此基础上考虑一次受力、二次受力、持载程度、加固筋类型、加固筋数量、混凝土强度等级等因素影响，建立加固梁抗弯承载力计算公式、刚度计算公式和裂缝宽度计算公式，并与试验数据进行了对比。结果表明：该加固技术采用高强钢绞线、钢筋网、钢丝网作为受力材料，虽然三者受力性能存在显著差异，但加固构件力学性能和破坏机理相似，可按统一计算公式进行承载力设计；公式计算值与试验结果符合良好，可用于实际工程计算。

Flexural Behavior and Bearing Capacity Calculation of RC Beams Strengthened with Reinforced High Performance Mortar

For achieving consensus of views about the flexural behavior of the beams strengthened with reinforced high performance mortar,based on the domestic experimental study on 95 strengthened RC beams,the flexural behavior and failure mechanism of these strengthened beams were analyzed.The formulas of the flexural bearing capacity,the flexural rigidity,and the crack width were proposed,with considering the influence of first load,secondary load,the magnitude of sustained load,quantity and style of the reinforcement,and concrete strength.The calculated values were compared with tested values.The results indicate that the reinforcement included high strength stainless steel strand,reinforcing mesh and steel wire mesh.Their mechanical performances were significantly different,but the flexural behavior and failure mechanism of these beams strengthened with the reinforcement were the same.So the uniform formula could be used to calculate the bearing capacity of these strengthened beams.The calculated values are consistent with that of the experiments and the formula can be used in actual practice.