场测数据静载试验装配式梁桥参数识别应用研究
发布时间：2018-12-21 20:24
【摘要】：目前在我国的中小跨径桥梁中，由于装配式梁桥自身特有的经济效益与设计施工优势，其数量所占比例极大。这些结构在服役不同年限后都面临着对其进行检测评定来确定是否有必要对其进行维修加固的决策问题。 本文依托宝泉岭二号公路桥的现场荷载试验，设计参数识别工况，利用现场实测挠度数据对此简支转连续的预应力混凝土连续梁桥进行静力参数识别。识别前假设结构处于线弹性工作范围内，识别参数选定梁体刚度，识别算法的目标函数设定为各测点的挠度之差，最后利用牛顿迭代法给出最小二乘意义上的参数识别值，以获取修正后的有限元模型。针对本文现场实测数据，通过对不同参数分组下识别值的甄别、挑选，最终确定该桥第二、四跨不满足承载能力的要求，给予有必要对其加固处理的评定结论。
[Abstract]:At present, due to the unique economic benefits and the advantages of design and construction of the prefabricated beam bridges in China, the number of them accounts for a large proportion. These structures are faced with the decision of whether it is necessary to repair and reinforce them after different years of service. Based on the field load test of Baoquanling No.2 Highway Bridge, the design parameters are identified. The static parameters of the prestressed concrete continuous beam bridge with simple support and continuous conversion are identified by using the field measured deflection data. Before recognition, it is assumed that the structure is in the range of linear elasticity, the stiffness of beam body is selected by identifying parameters, the objective function of the identification algorithm is set as the difference of deflection of each measuring point, and the parameter identification value in the sense of least square is given by Newton iteration method. The modified finite element model is obtained. According to the field measured data in this paper, the identification value under different parameter grouping is selected, and finally the second and fourth span of the bridge can not meet the requirements of bearing capacity, and the evaluation conclusion is given that it is necessary to reinforce the bridge.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U446
本文编号：2389412
[Abstract]:At present, due to the unique economic benefits and the advantages of design and construction of the prefabricated beam bridges in China, the number of them accounts for a large proportion. These structures are faced with the decision of whether it is necessary to repair and reinforce them after different years of service. Based on the field load test of Baoquanling No.2 Highway Bridge, the design parameters are identified. The static parameters of the prestressed concrete continuous beam bridge with simple support and continuous conversion are identified by using the field measured deflection data. Before recognition, it is assumed that the structure is in the range of linear elasticity, the stiffness of beam body is selected by identifying parameters, the objective function of the identification algorithm is set as the difference of deflection of each measuring point, and the parameter identification value in the sense of least square is given by Newton iteration method. The modified finite element model is obtained. According to the field measured data in this paper, the identification value under different parameter grouping is selected, and finally the second and fourth span of the bridge can not meet the requirements of bearing capacity, and the evaluation conclusion is given that it is necessary to reinforce the bridge.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U446
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