Abstract
The advanced transient concrete model (ATCM) is an extended model for concrete in compression at elevated temperature that incorporates elastic, plastic and creep strain as a function of temperature and stress history. The ATCM is applied with the material model of the thermal induced strain model. The non-linear model comprises thermal strain, elas- tic strain, plastic strain and transient temperature strains and load history modelling of restraint concrete structures sub- jected to fire. The mechanical strain calculated as a function of elastic strain, plastic strain and thermal induced strain. The thermal induced strain is relative independent compared to dependence of Young's Modulus by load history. Actually the term comprises elastic, plastic and (pure) transient creep strains as we will show. A comparison is given between experi- mental results with cylindrical specimens and calculated results. The equations of the ATCM consider a lot of capabilities, especially for considering irreversible effects of temperature on some material properties. By considering the load history during heating up, an increasing load bearing capacity due to a higher stiffness of concrete may be obtained. With this model it is possible to apply the thermal-physical behaviour of ma- terial laws for calculation of structures under extreme temperature conditions. The effect of load history in highly loaded structures under fire load will be investigated. The theoretical basis is given in this supplement added with an experimental study of concrete columns with various mixes.
Highlights
The non-linear model comprises thermal strain, elastic strain, plastic strain and transient temperature strains and load history modelling of restraint concrete structures subjected to fire
Calculations to predict the deformation rate and load bearing capacity of concrete structures at high temperatures are often based on material models according to Eurocode 2 (EC2)
EC2-Model and advanced transient concrete model (ATCM) are based on different material modelling parameters and the models show a different behaviour for deformations and restraint stresses for structural fire calculations
Summary
Calculations to predict the deformation rate and load bearing capacity of concrete structures at high temperatures are often based on material models according to Eurocode 2 (EC2). The following investigation describes the potential when using a new transient concrete model This model considers thermal induced strain with constant external load during heating up. A material model for calculation of siliceous aggregate concrete is given in [1] This new model is an extension of the former Thermal-Induced-Strain-Model (TIS-Model) and is called advanced transient concrete model respective ATCModel (ATCM). This examination is based on ordinary concrete with siliceous aggregates Both concrete models, EC2-Model and ATCM are based on different material modelling parameters and the models show a different behaviour for deformations and restraint stresses for structural fire calculations. The ATCM can be used to represent the results of specimens of every type of ordinary and high strength concrete This examination is based on ordinary concrete with a siliceous aggregate. This code is suitable to calculate complex structures with different material models
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