钢-混结合段的极限承载力研究

Study on Ultimate Bearing Capacity of Steel-concrete Composite Segment

采用ABAQUS软件建立精细有限元模型,考虑材料非线性和剪力钉的非线性荷载滑移关系及格室内混凝土的开裂与压碎,对4种不同构造的单格室模型进行非线性全过程分析,研究了3种传力构件(承压板、PBL连接件、剪力钉)的传力比例及共同工作性能,并分析了格室内各构件在加载过程中的破坏顺序及破坏形态。结果表明:4种模型的受力过程和破坏形态各不相同,考虑承压板作用的模型1中腹板的屈服区域随着荷载的增大并未明显扩大,荷载达到17 250 k N时,屈服区域仍较小;当荷载较大时,随着传力构件的减小,滑移量曲线的斜率逐渐趋于竖直;3种传力构件中,承压板的直接承压作用能够有效地提高构件的极限承载力;只有PBL连接件时,各连接件的受力较为均匀。

Considering the material nonlinearit,the nonlinear load-slip relationship of shear studs,and cracking and crushing of the concrete in cells,the fine finite element models of 4 single-cell models with different structural forms are established using ABAQUS software,then the force transmission ratio and work performance of bearing plate,PBL connector and shear studs are studied,and the damage order and forms of the components in cells under loading are analyzed.The result shows that（1） the failure processes and patterns of the 4 models are not identical,the yield region of web in model 1 is not significantly expanded with increasing of load when the role of the bearing plate is considered,when the load reaches 17 250 k N,the yield area is still relatively small;（2） when the load is large,the slope of the slippage curve tends to slip vertical with the decrease of force transmission component;（3） the direct effect of the pressure bearing plate can effectively improve the ultimate bearing capacity of the component in the 3 force transmission components;（4）the forces of the connecting members is more uniform when the PBL connectors are only set.