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为了研究桥面板分片子结构模态柔度综合的理论和实现方法,对2种进行动力计算分析模态柔度的方法以及其一致性进行了介绍。利用这2种方法获取不同子结构的质量归一的振型,并对子结构振型进行拼接得到整体结构的振型,进一步得到整体结构模态柔度(称为分片子结构模态柔度综合技术)。通过简支混凝土板的数值试验和实际钢-混凝土组合梁桥的真实试验,验证了利用分片子结构模态柔度综合技术测试识别桥面板模态柔度的可行性。在进行分片子结构模态测试的基础上,将单点输入多点输出(SIMO)子结构综合的模态参数与多点输入多点输出(MIMO)得到的整体结构模态参数进行比较。结果表明:单点输入单点输出(SISO)、SIMO和MIMO方法均能准确获取桥梁结构激励点的模态柔度系数,并能通过子结构振型拼接的方法获得与静力方法相差很小的模态柔度矩阵,可作为传统卡车加载测试有效补充的新型桥梁测试方法。
In order to study the theoretical and implementation methods of modal flexibility synthesis of bridge slab sub-structure, two kinds of methods of dynamic calculation and modal flexibility analysis and their consistency are introduced. Using these two methods, the mass-normal modes of different substructures are obtained, and the vibration modes of the substructures are spliced to obtain the vibration modes of the overall structure, and the modal flexibility of the overall structure is further obtained (referred to as the modal flexibility Integrated Technology). Through the numerical tests of simply supported concrete slabs and the real tests of the actual steel-concrete composite girder bridges, the feasibility of testing the modal compliance of the bridge slabs by the modal flexibility of composite sub-structure is verified. Based on the modal sub-structure test, the integrated modal parameters of SIMO substructure are compared with those of multi-input multi-point output (MIMO). The results show that the single point input single output (SISO), SIMO and MIMO methods can accurately obtain the modal flexibility coefficient of the bridge structure excitation points, and can be obtained by the method of sub-structure mode splicing a little different from the static method Modal flexibility matrix, which can be used as a new bridge test method effectively supplementing the traditional truck loading test.