采用步进加载的桥梁刚度量化识别方法

发布时间：2018-12-18 15:21

【摘要】：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%。
[Abstract]:Aiming at the problem of bridge stiffness identification, based on the conventional bridge load test, this paper presents a method to identify the bridge stiffness by loading the test load car step by step along the bridge longitudinal direction. The stiffness influence factor matrix is introduced, the measured deflection change matrix and the calculation deflection change matrix are established by step loading and finite element model respectively, and the method and process of identifying the stiffness influence factor by using the approximate level of control deviation are established. Taking a tied arch bridge as an example, the accuracy of single area and multi area damage identification is verified. The experimental results show that the recognition accuracy of the outer area of arch foot can reach 6.6, and the stiffness of concrete bridge can be located and quantified by the step loading method. The accuracy of identification and the level of approximation can be improved by using polynomial fitting to correct the measurement results.
【作者单位】：长安大学公路学院;山西省交通科学研究院黄土地区公路建设与养护技术交通行业重点实验室;中交公路规划设计院有限公司;西安市政设计研究院有限公司;熊本大学;
【基金】：国家自然科学基金项目(51208056) 黄土地区公路建设与养护技术交通行业重点实验室开放基金项目(KLTLR-Y12-7) 中央高校基本科研业务费专项资金项目(CHD2011JC173)
【分类号】：U441;U446

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