The purpose of this two-part paper is to develop an accurate and reliable triaxial material model for concrete used for nonlinear analysis of reinforced concrete structures under general loadings. The well known microplane theory is chosen for describing the fracture and damage of concrete under various stress states. On the basis of model M4 developed by Prof. Ba?ant et al. (2000), a novel microplane constitutive model for concrete is formulated. The new model, called microplane model M4L, is an improved version of model M4 with enhanced constitutive formulation (stress-strain boundaries) and computational algorithm.This part presents the theoretical development of the new model. The numerical validation and application of the new model to nonlinear analysis of a complex reinforced concrete structure will be given in the second part of this paper.
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机译：这两部分纸张的目的是为一般载荷下的钢筋混凝土结构的非线性分析开发一种准确可靠的三轴材料模型。选择众所周知的微板理论用于描述各种应力状态下混凝土的断裂和损伤。基于Ba'ant等人教授开发的M4模型。 （2000），配制了一种用于混凝土的新型微板本构模型。新模型称为Microplane Model M4L，是具有增强的构造（应力 - 应变边界）和计算算法的型号M4的改进版本。这部分提出了新模型的理论发展。本文的第二部分将给出新模型对复杂钢筋混凝土结构的非线性分析的数值验证和应用。
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