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大型钢结构发展迅猛,但经过长期服役,一旦发生破坏,后果十分严重,因此开展钢结构健康监测具有重大意义。以普通Q235钢板为研究对象,在其下表面铺设自制的碳纤维智能层,并对其进行3点弯曲试验,试验过程中钢板下表面的智能层的电阻变化率的变化与钢板下表面的平均应变的变化呈现很好的一致性。智能层的电阻变化率随钢板应变线性变化,灵敏度高,且具有很好的重复性。试验结果表明:根据碳纤维智能层的良好传感特性,可以实现钢结构服役过程中应变场的监测。
Large-scale steel structure is developing rapidly, but after long-term service, once the damage occurs, the consequences are very serious. Therefore, carrying out the monitoring of steel structure health is of great significance. The ordinary Q235 steel was taken as the research object and a self-made carbon fiber smart layer was laid on the lower surface of the Q235 steel. The bending test of 3-point bending test was carried out. The change of the resistance change rate of the smart layer on the lower surface of the steel plate and the average strain The changes show a good consistency. The change rate of the resistance of the smart layer varies linearly with the strain of the steel plate, has high sensitivity and good repeatability. The experimental results show that the monitoring of strain field during the service life of the steel structure can be realized according to the good sensing characteristics of the smart layer of carbon fiber.