混凝土梁的力电效应研究

A STUDY ON ELECTROMECHANICAL EFFECT OF CONCRETE BEAM

研究了混凝土梁的力电效应,通过附着在混凝土梁上、下表面的电极和计算机自动数据采集系统,检测混凝土梁在三点弯曲时产生的电流。试验表明,随着载荷的增加,电流强度增加。在载荷持续阶段,电流强度缓慢减小。突然卸载时,出现反向的电流。相同载荷下,在离加载点较近的梁段,产生的电流强度较大。研究了埋入混凝土梁中的碳纤维水泥复合材料(CFRC)立方试块的力电效应,CFRC展示了与素混凝土类似的力电关系。本研究为混凝土结构的应力自诊断提供了新的方法。

The electric current induced by the bending of the concrete beam is monitored through the electrode system and a computer auto data acquisition system attached to upper and down surface of concrete beam. Results show that the current intensity increases with increasing of the loading. When the loading keeps steady, the current intensity decreases gradually. During the unloading is suddenly, the reverse current appears. Under the same loadings, the comparative large current intensity will be induced at the section of concrete beam which is closer to the loading position. Meanwhile, the electromechanical effect for the Carbon Fiber Reinforced Cement (CFRC) specimen embedded into the concrete beam has been studied, it is shown that the CFRC shows the similar electromechanical phenomena as plain concrete. The conclusion of the paper will provide a new method for stress self - diagnosis of concrete structures.