光纤Bragg光栅传感器在钢筋混凝土梁静荷载试验中的研究

光纤Bragg光栅的发展使传感器自标定 ,不受光波的波动影响 ,且于光源和连接损耗无关 ,而这些因素却一直困扰着其他类型的光纤传感器。将光纤Bragg光栅和传统电阻应变片分别贴于H15 4和H15 5梁的混凝土表面 ,以及H15 6和H15 8梁的钢筋表面 ,以分别检测钢筋的拉应变和混凝土的压应变。当钢筋混凝土梁受到千斤顶的加载时 ,其应变可由上述传感器检测得到。光纤Bragg光栅传感器的波长偏移提供了一种绝对测量 ,可避免对建筑结构的不间断检测 ,而代之以需要之时的周期性检测

RESEARCH OF FIBER BRAGG GRATING SENSORS IN DEAD LOAD TEST OF RC GIRDER

The modern sensor with development of fiber bragg grating can be demarcated automatically.It can not affected by light-wave fluctuating,and nothing to do with lamp-house and loss of connecting,while these were troublesome factors with the other sensors.Fiber Bragg grating and traditional resistance strain foil were glued on the concrete surface of girders H154 and H155 and reinforcement of girders H156 and H158 to test compressive strain of concrete and tensile strain of reinforcement respectively.When the reinforced concrete girders were loaded by jack,those strain were measured by those sensors.A absolute measurement could be provided by wavelength shift of fiber Bragg grating sensor,and the necessary periodical examining could be done instead of uninterrupted test to construction structure.