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根据摄动有限元法原理,提出了基于测点间位移差的变化进行吊杆损伤识别的方法。进行吊杆损伤识别时,先测试吊杆节点间的高程差,并减去损伤前相同2个节点竖向位移差,得到吊杆损伤后2个节点竖向位移差的变化;再通过节点竖向位移差的变化构成吊杆损伤识别方程;当损伤识别初定方程和确定方程识别结果基本一致时,即判定吊杆发生损伤,并取2个方程所得吊杆损伤程度均值作为损伤程度;最后,以京珠高速郑州黄河二桥主桥为例验证了该方法。结果表明:采用该方法进行吊杆损伤识别,识别结果精度较高,即使对于小程度损伤也可识别,且测量误差对识别结果影响较小。
According to the principle of perturbed finite element method, a method to identify the damage of boom based on the change of displacement difference between measuring points is proposed. When detecting the damage of the boom, the difference of elevation between the boom points is firstly tested, and the vertical displacement difference of the same two nodes before the damage is subtracted to get the vertical displacement difference of the two nodes after the damage of the boom. When the damage identification initial equation and identification equation identification results are basically the same, that is to determine the boom damage, and take the two equations to obtain the average damage degree of the boom as the degree of damage; finally Taking Beijing-Zhuhai Expressway Zhengzhou Yellow River Bridge as an example, this method is validated. The results show that the method can be used to identify the damage of boom, and the accuracy of identification results is high, even for small degree damage, and the measurement error has little effect on the identification result.