对既有建筑物的抗震加固和节能改造是一项重要的工程。用钢绞线加固混凝土结构是一种新型的加固方法。对两组钢筋混凝土梁进行试验研究,对比分析加固前后梁的开裂荷载、屈服荷载、极限荷载和破坏形态的变化情况。试验结果表明,加固梁的承载力明显提高。最后,在试验的基础上,给出了可用于工程设计的极限受弯承载力的计算公式。 Seismic strengthening of existing buildings and energy-saving retrofit is an important project. Reinforcing concrete structure with strand is a new type of reinforcement method. Two groups of reinforced concrete beams were studied, and the changes of cracking load, yield load, ultimate load and failure mode of the beam before and after reinforcement were compared. The test results show that the bearing capacity of the strengthened beam is obviously improved. Finally, based on the experiment, the formula of ultimate flexural capacity which can be used in engineering design is given.