Discussion on Seismic Design of Bridge Column and Bent Cap Joint
Firstly,the research results of the force transfer mechanism and mechanical behavior of bridge column and bent cap joint under seismic load are introduced.And than the specific provisions of domestic and foreign design codes and standards on the principal stress checking calculation of joints are analyzed and compared,and the adoption of the shear area Ajv,the equivalent cross-section Ajh that bears the axial force of the column and the longitudinal reinforcement tension Tc of the concrete column are discussed.Finally,a calculation analysis is conducted based on actual bridge engineering.The analysis result shows that the anchorage length of the longitudinal reinforcement of the column in the core area of the joint is closely related to the value of the principal stress of the joint,and should be calculated based on the actual anchorage length.When the main compressive stress of the joint between the prestressed bent cap and the column exceeds the limit,in addition to appropriately increasing the limit,the measures such as adjusting the prestressing degree,the anchorage length of the column main reinforcement,or the height of the bent cap can be also taken to improve it.In addition,the rigid joint can be formed by controlling the minimum reinforcement ratio of horizontal stirrups in the core area of the joint.
seismic designjointprestressnominal principal tensile stressnominal principal compressive stressnominal shear stress
万方数据
维普
