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利用光纤光栅传感器长期稳定性好的特点,设计了一种预应力混凝土连续梁桥预应力索索力长期在线的监测方法,研制了一种小尺寸的光纤光栅传感器,印证预应力混凝土连续梁桥跨中下挠和梁体开裂等病害的发生与预应力索索力损失之间的关联。工程应用证明了该传感器及其实施方案的可行性,监测数据表明光纤光栅传感器运行稳定,检测数据可靠,仪表计算机系统建立的索力变化数据库,可为梁体病害的产生和预防起预警指示的作用,为桥梁管养提供科学依据。
Based on the long-term stability of FBG sensor, a long-term on-line monitoring method for prestressed cable force of prestressed concrete continuous girder bridge was designed. A small-sized fiber grating sensor was developed to verify the prestressed concrete continuous beam bridge span The relationship between the occurrence of such diseases as mid-to-low deflection and beam body cracking and the loss of the pre-stressed cable tension. The engineering application proves the feasibility of the sensor and its implementation scheme. The monitoring data show that the FBG sensor runs stably and the testing data is reliable. The database of cable force changes established by the computer system of the instrumentation can provide the warning indication for the generation and prevention of the beam body disease Role, provide a scientific basis for bridge management.