钢板加固受不同初始载荷RC梁抗弯试验研究

将经历不同加载历史的钢筋混凝土梁按其初始受力的大小划分为三种受力状态,并对这三种受力状态不同的混凝土梁卸载后,采用粘钢板加固法进行加固,使其提高到相同的承载力水平。研究在每一种加载历史下,粘钢板加固法加固的钢筋混凝土梁的抗弯性能,以及不同的初始载荷对加固效果的影响。结粜表明:采用钢板加固可以显著提高梁的抗弯承载力,同时对增强梁的抗弯刚度也有良好作用,加固前梁所受的初始载荷越大,相应梁的承载力则提高得越小,初始载荷较小的加固梁,加固后能很好的阻止原裂缝的扩展,而对于初始载荷较大的加固梁,在二次加载初期,加固材料并不能很好的阻止原裂缝的扩展。

Experimental study on flexural behavior of strengthened RC beams with steel plate under different initial loading

In this paper,reinforced concrete beams which go through different loading history are divided into three kinds of conditions in accordance with initial load.After unloading,fastened steel sheet reinforced method is used to strengthen the three beams to the same bearing capacity,the flexural behavior of strengthened reinforced concrete beams with fastened steel sheet method under every loading history are studied,and the influence of different initial loading to reinforced effect is known.The result shows that the flexural behavior of reinforced concrete which is strengthened with steel sheet can be obviously raised.The bigger initial loading of beams suffered before reinforcement,the smaller bearing capacity of corresponding beams raised.The reinforced beams under small loading can prevent expansion of original cracking,on the contrary,the reinforced beams under big loading can not prevent expansion of original cracking.