COUPLED ANALYSIS OF THERMO-CHEMICAL AND MECHANICAL DEGRADATION OF CONCRETE AT HIGH TEMPERATURES

被引：0

作者：

Cramer, F. ^{[1
]}

Ostermann, L. ^{[1
]}

Kowalsky, U. ^{[1
]}

Dinkler, D. ^{[1
]}

机构：

[1] TU Braunschweig, Inst Struct Anal, D-38106 Braunschweig, Germany

来源：

CORAN 2011: PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON RECENT ADVANCES IN NONLINEAR MODELS - STRUCTURAL CONCRETE APPLICATIONS | 2011年

关键词：

Concrete; High Temperatures; Thermo-chemical Damage; Mechanical behavior; Non-local Damage; Structural Analysis; HYGROTHERMAL BEHAVIOR; DAMAGE;

D O I：

暂无

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A model for the numerical analysis of hygro-thermal and mechanical behavior of concrete at high temperatures including transport, reaction and deformation processes is presented. The mechanical model is developed within the framework of plasticity and damage mechanics. The phenomenon of localization of local damage models is overcome by a non-local implicit gradient enhanced formulation. The transport process is described by the balance equations for mass and enthalpy and the constitutive equations for concrete at high temperatures. The degradation of the cement minerals C-S-H and portlandite is included by two chemical reactions. Finally, the finite element formulation for solving the coupled balance equations regarding the primary variables displacement, non-local strains, temperature and relative humidity is presented and two numerical results are discussed.

引用

页码：627 / 636

页数：10

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