Failure Evaluation of Reinforced Concrete Beams Using Damage Mechanics and Classical Laminate Theory

作     者：JoséMário Feitosa Lima Geraldo JoséBelmonte dos Santos Paulo Roberto Lopes Lima 

作者机构：State University of Feira de SantanaTechnology DepartmentFeira de SantanaBahia44030-900Brazil 

出 版 物：《Journal of Architectural Environment & Structural Engineering Research》 (建筑环境与结构工程研究（英文）)

年 卷 期：2022年第5卷第4期

页      面：1-9页

学科分类：08[工学] 081304[工学-建筑技术科学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学] 

基　　金：funded by CNPq,grant numbers 313693/2019-6 and 408135/2021-2 State Univer­sity of Feira de Santana,grant numbers 034/2021 and 064/2021 

主　　题：Reinforced concrete Damage mechanics Finite element method Laminate theory 

摘      要：The prediction of the behavior of reinforced concrete beams under bending is essential for the perfect design of these ***,the classical models do not incorporate the physical nonlinear behavior of concrete under tension and compression,which can underestimate the deformations in the structural element under short and long-term *** the present work,a variational formulation based on the Finite Element Method is presented to predict the flexural behavior of reinforced concrete *** physical nonlinearity due cracking of concrete is considered by utilization of damage concept in the definition of constitutive models,and the lamination theory it is used in discretization of section cross of *** the layered approach,the reinforced concrete element is formulated as a laminated composite that consists of thin layers,of concrete or steel that has been modeled as elastic-perfectly plastic *** comparison of numerical load-displacement results with experimental results found in the literature demonstrates a good approximation of the model and validates the application of the damage model in the Classical Laminate Theory to predict mechanical failure of reinforced concrete *** results obtained by the numerical model indicated a variation in the stress-strain behavior of each beam,while for under-reinforced beams,the compressive stresses did not reach the peak stress but the stress-strain behavior was observed in the nonlinear regime at failure,for the other beams,the concrete had reached its ultimate strain,and the beam’s neutral axis was close to the centroid of the cross-section.