Simulation of Random Crack Generation in Concrete Members with Uniform Stress Fields

• 作 者: CHRISTIAN Meyer
• 机 构: Department of Civil Engineering and Engineering Mechanics Columbia University New York 10027 U.S.A.
• 出 处: Journal of China University of Mining & Technology(English E
• 发表日期: 2004年期
• 关键词: Uniform tensile inspection cracking deviation cracked exactly assumed fluctuate

The randomness of strength and deformation of concrete material is serious and should be considered both in theoretical analyses such as Finite Element Methods and engineering practice, specially for those structural members with a uniform stress field, where stresses or strains are approximately the same under loading. A mathematical ap- proach of producing a series of random variables of the ultimate tensile strain in concrete is proposed to describe the randomness ofconcrete deformation. With reinforced concrete finite elements a real model calculation method is found for the randomness of initial cracks determined by a minimum tension strain within the uniform stress fields of concrete members. The proposed methods in our paper have as aim to improve the existing method used by FEM and other rela- tive approaches, which normally pay less attention to randomness with consequences that may possibly differ from testing or practice. The method and sample computation as indicated is meaningful and comply with testing and engi- neering practice.

The randomness of strength and deformation of concrete material is serious and should be taken both in theoretical analyzes such as Finite Element Methods and engineering practice, specially for those structural members with a uniform stress field, where stresses or deformation A mathematical ap- proach of producing a series of random variables of the ultimate tensile strain in concrete is proposed to describe the randomness ofconcrete deformation. With reinforced concrete finite elements a real model calculation method is found for the randomness of initial cracks determined by a minimum tension strain within the uniform stress fields of concrete members. The proposed methods in our paper have as aim to improve the existing method used by FEM and other rela- tive approaches, which normally pay less attention to randomness with consequences that may possibly differ from testing or practice. The method and sample computation as indicated is mea ningful and comply with testing and engi- neering practice.