Unified calculation method and its application in determining the uniaxial mechanical properties of concrete  

作　　者：Faxing DING Xiaoyong YING Linchao ZHOU Zhiwu YU 

机构地区：[1]College of Civil Engineering,Central South University,Changsha 410004,China

出　　处：《Frontiers of Structural and Civil Engineering》2011年第3期381-393,共13页结构与土木工程前沿（英文版）

基　　金：This research work was financially supported by the National Natural Science Foundation of China(Grant No.50808180);the Ph.D.Programs Foundation of the Ministry of Education of China(Grant No.200805331064).

摘　　要：This paper presents a unified calculation method and its application in determining the uniaxial mechanical properties of concrete with concrete strengths ranging from 10 to 140MPa.By analyzing a large collection of test results of the uniaxial mechanicalproperties of normal-strength,high-strength and super high-strength concrete in China and performing a regression analysis,unified calculation formulas for the mechanical indexes of concrete are proposed that can be applied to various grades of concrete for determining the size coefficient,uniaxial compressive strength,uniaxial tensile strength,elastic modulus,and strain at peak uniaxial compression and tension.Optimized mathematical equations for the nonlinear stress-strain relationship of concrete,including the ascending and descending branches.under uniaxial stress,are also established.The elastic modulus is almost constant throughout the elastic stage for the ascending branches of the stress-strain relationship for concrete.The proposed stress-strain relationship of concrete was applied to the nonlinear finite element analysis of both a steel-concrete composite beam and a concrete-filled steel tubular stub column.The analytical results are in good agreement with the experiment results,indicating that the proposed stress-strain relationship of concrete is applicable.The achievements presented in this paper can be used as references for the design and nonlinear finite element analysis of concrete structures.

关 键 词：CONCRETE mechanical properties stress-strain relationship uniaxial stress APPLICATION 

分 类 号：TU5[建筑科学—建筑技术科学]