3.1 Concrete

These are several predefined concrete materials in the material Library. These materials are according to code ACI-318R-05. The following table shows materials with their code dependent properties.

There are two groups of properties

Code independent

Code dependent ACI 318(M)-05

Note – Letter (M) in the name ACI 318(M)-05 means the values are calculated according to formulas metric unit and recalculated into US unit

Name – name of the concrete class, where value 3000,4000 etc. presents specified compressive strength of concrete in “psi” unit, for example C 3000

Code independent – this part of material is the same for all codes

Material type – concrete – sign which type of material is it

Thermal expansion

the coefficient used for the calculation of temperature load;

value =5,55e-06 inch/inchF

Unit mass – value = 0,155 kips/ft³ for normal weight concrete

E modulus (chapter 8.5.1 ACI 318-05)

Where w_c = 155lb/ft³ for reinforced concrete

Poisson coeff (μ). – Poisson coefficient for calculation G modulus and others

Independent G modulus – when this checkbox is set OF then G modulus is calculated using E modulus and Poisson coefficient

Log. Decrement – the value needed for the damped oscillation in dynamics

Colour – colour of material needed for drawing and filters

Order in code – number of the material in the code

Code dependent

Specified compressive strength

Only value in interval <f_c’_min, f_c’_max> can be defined if check box “Calculated dependent values” is turned on

Only positive value can be defined if check box “Calculated dependent values” is turned off

Calculated dependent values

If the check box is turned on, the values Ec, fr, eps o, eps cu are calculated according to code ACI 318(M)-05 and they are not editable

If the check box is turned off, the values Ec, fr, eps o, eps cu can be inputted by user and they are editable

Square root of specified compressive strength

Specified compressive strength for design

the coefficient coeff_fcd is defined in Concrete setup see chapter "4.1 Concrete setup for 1D member"

Modulus of rupture

Strain art reaching maximum strength eps o

Only value in interval [0, eps cu] can be defined

Maximum compressive strain eps cu

Maximal possible elongation of the concrete see picture of stress-strain diagram

Eps_cu=0,03

Stress and strain diagram

Type of diagram – there is only one option for ACI code – Parabola-rectangle diagram

Picture of diagram – three dot button with drawn diagram

The values of concrete strength are the following:

 

 

List of the material with its properties is displayed in the following tables

US units format

In metric format: