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提出了一种基于高精度低阶测试模态对桥梁构件抗弯刚度通过导入最佳参数进行平差的最小二乘解识别方法。通过对混凝土试验梁及一座3跨变截面连续箱梁抗弯刚度现场检测及数值模拟计算,结果表明,此方法有效地抑制了模态振型测试误差对识别精度的过度影响,即使对1.5%的锯齿形严重模态振型误差及20%的偶然模态振型误差,识别精度都在6%左右,较好地满足工程精度要求。此外,通过多例模拟数值计算表明锯齿形模态振型误差可作为识别精度的控制性误差。
A method based on high-precision low-order test modal is proposed to identify the least square solution of the bridge member bending stiffness by introducing the best parameters. The results of field test and numerical simulation of the flexural rigidity of concrete test beam and a 3-span continuous box girder show that this method can effectively restrain the excessive influence of modal vibration test error on the recognition accuracy, Serious modal shape error and 20% accidental mode shape error, the recognition accuracy is about 6%, which can better meet the requirements of engineering accuracy. In addition, numerical simulation of multiple models shows that zigzag mode shape error can be used as the control error of recognition accuracy.