超高性能混凝土与普通混凝土界面抗剪强度计算方法OA北大核心CSTPCD

In order to improve the accuracy and rationality of the calculation of shear strength of the interface between ultra-high performance concrete(UHPC)and normal concrete(NC),the relevant experimental data in domestic and foreign literatures were widely collected to establish a database of UHPC-NC bonding shear tests with total 521 test data.Based on the assumption of an interfacial shear failure mechanism,the calculation method of shear strength of the UHPC-NC interface was proposed through theoretical analysis and data fitting.Compared with the existing code design methods and empirical prediction methods,the proposed calculation method exhibits higher accuracy.In addition,the proposed calculation method was used to improve the damage initiation criterion of interfacial cohesive element using the secondary development of ABAQUS,and the finite element model of UHPC wet joint bending tests was developed.Compared with test results in the existing research,the finite element model is proved to be able to simulate the flexural performance of UHPC joint,which can be used for the engineering design and optimization of UHPC-NC composite members.