钢筋混凝土构件拉伸破坏过程的三维模拟研究

采用三维的材料破坏过程分析系统RFPA3D(3D-Realistic Failure Process Analysis)对钢筋混凝土轴心受拉构件的受力、变形与内部裂纹萌生、扩展及最终破坏的断裂全过程进行了数值模拟。充分考虑了混凝土的非均匀性,通过简单直观的本构模型并采用单元材料性质弱化的办法,利用位移加载来实现钢筋混凝土构件的拉伸破坏过程,再现了钢筋混凝土结构中等间距裂缝形成过程,从细观角度模拟分析了混凝土及钢筋的破坏过程及破坏机理。数值试验结果对于深入了解钢筋和混凝土的联合受力规律有参考价值。

3-D numerical research on failure process of reinforced concrete specimen under uniaxial tension

A numerical code RFPA3D(realistic failure process analysis) is used to simulate failure process,including the crack initiation,propagation and final failure of reinforced concrete model under uniaxial tension.China;2.Department of Environment Science,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China;3.College of Civil and Hydraulic Engineering,Dalian University of Technology,Dalian 116024,China) The paper introduces a certain statistical function to reflect the concrete heterogeneity,the elastic damage constitutive law with residential strength is used and the mechanical properties of the elements are reduced when the stresses meet the failure criterion.The displacement-controlled loading scheme is used to finish the numerical simulation of failure process of the specimens.It reproduces failure process of the fracture initiation,infilling and saturation of the reinforced concrete.Complete non-linear load-displacement curves as well as fracture pictures during damage evolution process are obtained to investigate the reinforcement and concrete mechanical properties in meso-level.The results of this numerical modeling improve our understanding of the stress distribution features of the reinforced concrete