| 李荣涛,李锡夔.高温下混凝土的本构模拟及破坏分析[J].计算力学学报,2007,24(5):550~554 |
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| 高温下混凝土的本构模拟及破坏分析 |
| Constitutive modeling of concrete at high temperature and failure analysis |
| 修订日期：2005-06-02 |
| DOI：10.7511/jslx20075108 |
| 中文关键词: 化学-热-水力-力学耦合过程,本构模拟,混凝土,高温 |
| 英文关键词:coupled chemo-thermo-hydro-mechanical processes,constitutive modeling,concrete,high temperature |
| 基金项目:国家自然科学基金(50278012,10272027)，国家973项目(2002CB412709)资助项目 |
| 李荣涛 李锡夔 |
大连大学建筑工程学院 大连116022(李荣涛)
，大连理工大学工业装备结构分析国家重点实验室 大连116024(李锡夔)
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| 中文摘要: |
| 针对已建立的高温下混凝土中化学-热-水力-力学耦合过程分析的分级数学模型,发展了混凝土的化学-热-水力-力学(CTHM)耦合本构模型。在已有的Willam-Warnke弹塑性屈服准则基础上发展了考虑脱水和脱盐引起的材料损伤及化学塑性软化、塑性应变硬化/软化和吸力硬化的广义Willam-Warnke本构模型,模拟高温下混凝土的材料非线性行为。为保证全局守恒方程的Newton迭代过程的二阶收敛率,导出了非线性化学-热-水力-力学(CTHM)耦合本构模型的一致性切线模量矩阵。数值结果显示了本文所发展的化学-热-水力-力学(CTHM)耦合本构模型在模拟高温下混凝土中复杂破坏过程的能力和有效性。 |
| 英文摘要: |
| A coupled chemo-thermo-hydro-mechanical(CTHM) constitutive model for concretes is developed for the hierarchical mathematical model in the coupled chemo-thermo-hydro-mechanical analysis of concretes at high temperature.Based on the existing elasto-plastic Willam-Warnke yield criterion,a generalized Willam-Warnke yield criterion with consideration of material damage and chemo-plastic softening due to the dehydration and the desalinization,plastic strain hardening/softening and suction hardening is developed to simulate the non-linear material behavior of concretes at high temperature.Consistent tangent modulus matrices for coupled non-linear chemothermo-hydro-mechanical constitutive modeling are formulated to ensure the second order convergence rate for the Newton iterative procedure of the global balance equations.The numerical results demonstrate the capability and the validity of the proposed coupled CTHM constitutive model in simulating the complex failure processes in concretes at high temperature. |
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