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Experimental Study on Failure Criterion and Constitutive Relation of Early-age C20 Concrete under Biaxial Stress State

Author: LiuHuiXun
Tutor: DingHongYan
School: Tianjin University
Course: Construction engineering and management
Keywords: C20 concrete early age Two stress state Failure criterion Octahedral stress space Elastoplastic constitutive Strength and deformation characteristics
CLC: TU528
Type: PhD thesis
Year: 2009
Downloads: 213
Quote: 0
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Abstract


Early age concrete material failure criteria and constitutive relation is nonlinear analysis of concrete structures construction period and calculated on the basis, but due to the current theoretical study of its serious lag, resulting in early age concrete structure calculation analysis of advanced algorithms and rough theory does not match, or even impossible to find a suitable failure criteria and constitutive relations can be based, thus seriously hampered the construction template early removal and other advanced technology development and applications. Therefore, the conduct of early age concrete material failure criteria and constitutive relations, has an important theoretical significance and practical value. In order to give the most adverse conditions template early dismantling construction technology research of early age concrete structure nonlinear computational analysis provides a theoretical basis for the two dimensional stress state of early age concrete material strength and deformation characteristics test. On an experimental basis, first established early age concrete material failure criterion and the initial yield criterion, and then based on the relationship between the two was established based on non-uniform isotropic hardening law subsequent yield criteria, the final strength criterion based on these three characteristics, establishment of early age concrete elastoplastic constitutive relations. The main findings are as follows: 1, through the early age strength of concrete cube compressive strength test measured, prism compressive strength, static axial tensile strength and modulus of elasticity, and the test data the research and analysis, obtained in the test of the strength index age range of the best mathematical regression equation, so as of early age concrete structure calculations in mechanics parameter selection provides a theoretical basis; 2, in the early age concrete under uniaxial compression strength and deformation characteristics test, based on the comparative analysis of early age concrete and ordinary concrete uniaxial compressive stress - strain curves of the discrepancy and further established through mathematical methods of early age concrete uniaxial compressive stress - strain standard full curve equation, so as of early age concrete structures or members in a uniaxial stress state of the nonlinear analysis provides a theoretical basis; 3, based on two dimensional stress state of early age concrete material strength test data in octahedral stress space distribution characteristics, through regression analysis and mathematical derivation, the establishment of octahedral stress space early age concrete material failure criteria, the initial yield criterion and subsequent yield criteria and failure criteria established on the basis of further expression in the form of principal stress early age concrete two-axis intensity envelope, so as of early age concrete materials in uniaxial and biaxial stress state of the intensity provides a theoretical basis; 4, learn elastoplastic constitutive theory, according to early age destruction of concrete envelope, initial yield, and the reference face of the envelope surface octahedral stress space division status, based on the divided area and the two enveloping surfaces and the intensity of a reference plane in the stress space between the relative positions, respectively, to out of the respective regions constitutive model, and then get up early age concrete materials are generally in the form of elastic-plastic constitutive relation, so as of early age concrete structures or members of a biaxial stress state of the nonlinear analysis provides a theoretical basis.

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CLC: > Industrial Technology > Building Science > Building Materials > Non-metallic materials > Concrete and concrete products
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