混凝土界面粘结性能有限元分析

关于超高性能混凝土（UHPC）与普通混凝土（NC）粘结界面的试验研究较多,但如何在有限元软件中进行有效的模拟并进行相关参数分析的研究仍较少。本文利用大型有限元分析软件Abaqus建立了采用粘聚力单元以模拟UHPC与NC粘结界面的有限元模型,并通过修改粘聚力模型参数分析了不同界面粗糙程度下UHPC-NC界面的粘结性能。建立了直接剪切、斜剪试验有限元模型,且利用摩尔库伦强度理论反推界面摩擦系数。结果表明：通过粘聚力单元模拟UHPC-NC界面能很好的反应实际的受力性能。

Finite Element Analysis on Bonding Properties of Concrete Interface

There are many experimental studies on the bonding interface between ultra-high performance concrete(UHPC)and normal concrete (NC).However, there are few researches on how to effectively simulate and analyze the relevant parameters in the finite element software.In this paper, a large-scale finite element analysis software Abaqus is used to establish a finite element model to simulate the bonding interface between UHPC and NC, and the bonding properties of UHPC-NC interface with different roughness are analyzed by modifying the parameters of the cohesion model. The finite element models of direct shear and oblique shear tests are established, and the interfacial friction coefficient is deduced by using the Mohr Coulomb theory. The results show that the simulation of uhpc-nc interface by cohesive element can well reflect the actual mechanical performance.