混合梁结合部格室-承压板协同作用机理

Load Transfer Mechanism Between Cells and Bearing-plate in Hybrid Girder Joint

为揭示混合梁结合部格室与承压板协同作用机理,基于弹性连续介质层法,考虑钢与混凝土间滑移效应及承压板对混凝土的局部承压作用,建立了格室-后承压板式混合梁结合部的理论计算方法.并与有限元计算结果进行比较,探讨了结合部传力机理的影响因素.研究结果表明,钢板-混凝土板累计轴向变形的差异是导致最大相对滑移出现在远离承压板一端的主要原因;随着结合部长度的增长,连接件剪力最大值呈先增大后减小至某一固定值的变化趋势;增加连接件刚度不会引起其剪力的大幅增长,增加混凝土轴向刚度或者减小钢格室轴向刚度均可减小连接件剪力.

To investigate the load transfer mechanism of hybrid girder joint with cells and bearing plate, a theoretical model was established to calculate this hybrid structure, based on the method of continuous elastic interlayer. This model considered the slip effect between steel and concrete, and the local press effect of the bearing plate. By comparing the calculation results of this theoretical model and a finite element model, and analyzing its affecting factors, the following conclusions were obtained. The discrepancy of accumulated axial deformation between steel and Concrete works as a main reason of the fact that the maximum shear force of its connectors occurs at the end of the hybrid joint, far away from the rear bearing-plate. And this maximum shear force will experience a trend of first increase, then decrease and finally approaching to an invariable value, if the length of joint grows. Increasing the stiffness of the connector will lead to the increase of its maximum value, but in a relatively lower level. Increasing the axial rigidity of concrete or decreasing the axial rigidity of steel will both lead to the decrease of connectors＇ shear force.