利用铅芯监视裂缝出现的方法,以前也有人用过,但是使用不得法,达不到预期的目的而被否定。我们在钢筋混凝土偏心受拉构件试验和金山输水工程的钢筋混凝土压力渠道试验中对铅芯的性能进行了一些研究。一、利用铅芯的脆性监视裂缝铅笔芯是脆性的,它的延性极低。我们在拉力机上做拉伸试验,铅芯未断之前,伸长极微而不易测读,一旦明显伸长,它已断裂。而混凝土构件也有类似性,我们还可以 The method of using the lead core to monitor the occurrence of cracks has been used before, but it has been denied because it is not lawful and fails to achieve the intended purpose. We conducted some studies on the performance of lead cores in the test of reinforced concrete eccentric tension members and the reinforced concrete pressure channel test of Jinshan Water Transfer Project. First, the use of lead core brittle monitoring cracks pencil core is brittle, its very low ductility. We did a tensile test on a pull machine. Before the lead was broken, the elongation was minimal and not easy to read. Once it was significantly extended, it broke. Concrete components also have similarities. We can also