铁道科学与工程学报2025，Vol.22Issue(2)：690-711,22.DOI:10.19713/j.cnki.43-1423/u.T20240647
多类混凝土损伤比强度理论及塑性-损伤模型研究进展与应用
Research progress and application of concrete damage ratio strength theory and plastic-damage model
摘要
Abstract
To enhance the concrete strength theory and plastic-damage model,a series of work was performed in this paper.Referring to the rock damage ratio strength theory,based on multiaxial strength test data of various types of concretes such as plain concrete,recycled aggregate concrete,lightweight aggregate concrete,and fiber concrete,the five empirical coefficients in the damage ratio variable were recommended.This improves the damage ratio strength theory for various types of concretes and elucidates the working principles of confined concretes.The analysis indicates that with the increase in hydrostatic pressure,the compressive damage ratio of concrete decreases linearly from around 1 under uniaxial compression to less than 0.5.The octahedral shear stress initially increases and then decreases,while the axial peak stress increases to a certain value.The inelastic volume expansion decreases to be constant when the pressure damage ratio decreases,leading to the transition of concrete from brittle failure under uniaxial compression to plastic failure under multi-axial compression.This strength theory provides a theoretical basis for exploiting the energy consumption potential of concrete in concrete-filled steel tubular columns.Based on the concrete damage ratio strength theory,the triaxial strength parameters for various types of concrete in the plastic-damage model were determined.These parameters included the dilation angle,the ratio of tensile meridian to compressive meridian,and the ratio of biaxial isobaric strength to uniaxial compressive strength.Additionally,equations of uniaxial stress-strain curves and corresponding parameter expressions for various types of concretes under static loading at room temperature,under seismic loading at room temperature,and under fire heating conditions were proposed,respectively.On these bases,a triaxial plastic-damage model of confined concrete was established.The plastic-damage model for various types of concretes was applied in finite element models of steel-concrete composite structures.In the model,the concrete was represented using solid elements,while steel tubes and steel beams were represented using shell elements.This setup allows for the simulation of interface slip and restraint between the steel tube and concrete.When employing the reinforcement strong column construction method,the bearing capacity,seismic resistance,and fire resistance of the steel tube concrete column and its structure can be enhanced.关键词
混凝土/损伤比/强度理论/塑性-损伤模型/三轴参数/应力-应变曲线/实体-壳单元模型Key words
concrete/damage ratio/strength theory/plastic-damage model/triaxial parameter/stress-strain curve/solid-shell finite element model分类
建筑与水利引用本文复制引用
丁发兴,余志武,吴霞,吕飞,王文君,孙浩,SADAT Said Ikram,许云龙,王恩,王莉萍..多类混凝土损伤比强度理论及塑性-损伤模型研究进展与应用[J].铁道科学与工程学报,2025,22(2):690-711,22.基金项目
国家自然科学基金面上项目(51978664) （51978664）
中南大学中央高校基本科研业务费专项资金资助项目(2022ZZTS0603) （2022ZZTS0603）
中南大学高性能计算平台资助项目 （）
