用于钢筋混凝土梁的光纤光栅应变传感器

在变形测定器中,光纤Bragg光栅被粘贴于内管的两端,这两端的距离确定了传感器的量规长度。为了测量拉应变和压应变,该光纤光栅必须保持处于与可能的最大压应变相等的永久性拉应变。将光纤Bragg光栅贴于H154梁的混凝土表面和H158梁的钢筋表面,以分别检测拉应变和压应变。当钢筋混凝土梁受到千斤顶的加载时,它的应变可由光纤Bragg光栅的反射Bragg波长的偏移量获得。实验表明,作为一种绝对检测器件,光纤Bragg光栅为钢筋混凝土梁提供了有效监测,其中,拉应变~1000me,而压应变~1500me。

Fiber Bragg grating strain sensors for reinforced concrete girders

In a extensometer, a fiber Bragg grating is attached at two ends of the inner tube, therein the separation of these two bonding ends defines the gauge length of the sensor. To measure compressive and tensile strain, the grating is required to exist in a state of permanent tensile strain equal to the largest compressive strain it is ever likely to experience. The fiber Bragg grating strain sensors are bonded on the concrete surfaces of H154 and the reinforcing steel bar surfaces of H158 girders to measure the compression and tension strain separately. When the reinforced concrete girders are loaded by the jack, theirs strain are measured by the shift quantity of reflected Bragg wavelength in these sensors. The experiment indicates that as an absolute measurement component, the fiber Bragg grating offers the effective monitoring for RC girder, whereinto, the tension strain is ~1000 me, and the compression strain is ~1500 me.