混凝土微平面本构模型程序

主要工作由缪志伟同学完成

开发了混凝土微平面本构模型，可以分析各类复杂受力混凝土

计算结果和试验结果吻合良好，且表现出很强的非线性分析能力

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论 文 题 目	期刊/会议名称	下载
基于通用有限元程序和微平面模型分析复杂应力混凝土结构	沈阳建筑大学学报(自然科学版), 2008	点击下载
Nonlinear FE model for RC shear walls based on multi-layer shell element and microplane constitutive model	Proc. Computational Methods in Engineering And Science (EPMESC X), 2006	点击下载

基于通用有限元程序和微平面模型分析复杂应力混凝土结构
沈阳建筑大学学报(自然科学版), 2008, 24(1), 49-53.

摘要：目的 为了能准确模拟混凝土的各种复杂力学行为，从而对复杂应力混凝土结构进行准确分析。方法 本文基于近年来兴起的基于微观层次的混凝土本构模型——微平面模型原理，将其与具有优越非线性分析能力的通用有限元程序MSC.MARC相结合，开发了相关程序，并对混凝土在单轴、双轴、三轴受力状态、往复受力等各种应力状态下的行为和一片实际剪力墙的滞回加载进行了模拟分析计算。结果 通过与相关试验结果的比较，验证了程序的可靠性，并指出了现有通用有限元程序在模拟复杂应力混凝土受力行为上的问题。结论 表明本程序可较好的应用于分析复杂混凝土结构。

关键词：混凝土有限元；微平面模型；宏观本构模型；非线性分析

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Nonlinear FE model for RC shear walls based on multi-layer shell element and microplane constitutive model
Proc. Computational Methods in Engineering And Science (EPMESC X), Tsinghua University Press & Springer-Verlag, Aug. 2006, Sanya, Hainan,China, 2006, CDROM.

Abstract: Nonlinear simulations for structures under disasters have been widely focused on in recent years. However, precise modeling for the nonlinear behavior of reinforced concrete (RC) shear walls, which are the major lateral-force-resistant structural member in high-rise buildings, still has not been successfully solved. In this paper, based on the principles of composite material mechanics, a multi-layer shell element model is proposed to simulate the coupled in-plane/out-plane bending and the coupled in-plane bending-shear nonlinear behaviors of RC shear wall. The multi-layer shell element is made up of many layers with different thickness. And different material models (concrete or rebar) are assigned to various layers so that the structural performance of the shear wall can be directly connected with the material constitutive law. And besides the traditional elasto-plastic-fracture constitutive model for concrete, which is efficient but does not give satisfying performance for concrete under complicated stress condition, a novel concrete constitutive model, referred as microplane model, which is originally proposed by Bazant et al., is developed to provide a better simulation for concrete in shear wall under complicated stress conditions and stress histories. Three walls under static push-over load and cyclic load were analyzed with the proposed shear wall model for demonstration. The simulation results show that the multi-layer shell elements can correctly simulate the coupled in-plane/out-plane bending failure for tall walls and the coupled in-plane bending-shear failure for short walls. And with microplane concrete constitutive law, the cycle behavior and the damage accumulation of shear wall can be precisely modeled, which is very important for the performance-based design of structures under disaster loads.

Keywords: shear wall, nonlinear analysis, microplane, finite element, multi-layer shell element

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单轴受压	单轴受拉
双轴破坏包络面	三轴受力破坏包络面
静水压力	滞回受力