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针对桥梁刚度识别问题,在常规桥梁荷载试验的基础上,提出一种将试验加载车沿桥梁纵向逐步前进加载进行桥梁刚度量化识别的方法。引入刚度影响因子矩阵,采用步进加载及有限元模型分别建立实测挠度变化矩阵和计算挠度变化矩阵,并建立控制偏差逼近水平从而对刚度影响因子进行识别的方法及流程。以一座系杆拱桥为例,验证了单一区域及多区域损伤的识别准确性。试验结果表明:拱脚外区域识别精度可达到6.6%;采用步进加载方法可以对混凝土桥梁的刚度进行定位与量化识别;采用多项式拟合对测量结果进行修正后,可提高识别精度,逼近水平提高18%。
Aiming at the bridge stiffness identification problem, based on the conventional bridge load test, a method of quantitatively identifying bridge stiffness by loading the test load truck along the longitudinal direction of the bridge is proposed. The influence matrix of stiffness is introduced. The measured deflection matrix and the deflection matrix are respectively established by step loading and finite element model. The method and process of identifying the influence factor of stiffness are established by controlling the bias approximation level. Taking a tied arch bridge as an example, the accuracy of single-zone and multi-zone damage identification is verified. The experimental results show that the accuracy of identification outside the arch foot can reach 6.6%. The step loading method can locate and quantify the stiffness of concrete bridges. After the measurement results are corrected by polynomial fitting, the accuracy of identification can be improved and the approaching level Increase by 18%.