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1混凝土本构关系和破坏准则1．1单向应力状态下的本构关系和破坏准则单向受压应力应变关系采用Saenz公式[1]式中σ——应变为。时的应力；E0——初始弹性模量，Es——最大应力点处的割线模量；εc——圆柱体抗压强度对应的应变。单向受压，认为混凝土达极限压应变。c。—－0．0
1 Concrete constitutive relations and failure criteria 1.1 Constitutive relations and failure criteria under uniaxial stress The unidirectional compression stress-strain relationship adopts the Saenz formula [1] where σ is the strain. The stress at time; E0 - initial elastic modulus, Es - the secant modulus at the maximum stress point; εc - the strain corresponding to the compressive strength of the cylinder. One-way compression, that the concrete reaches the ultimate compressive strain. c. —-0.0