Table of Contents
What is S11 S22 S33?
The components of normal stress in the three directions are called the principal stresses and are denoted as S11, S22 and S33. These components of stress represent the maximum possible magnitude of tensile and compressive stress at the particular point under consideration.
What is S12 stress?
S12 is the shear stress, but again not necessarily the maximum shear stress. S11 and S22 are not the principal stresses, but the normal stresses associated with the global coordinate system defined in your model.
What is D C ratio in Etabs?
D stands for ‘demand’ and C stands for ‘capacity’, therefore the D/C ratio is a measure of the demand on a member against its capacity. For example, if a member can support a maximum load of 100 kN (capacity) and the load it is subjected to is 80 kN (demand) the D/C ratio would be 80/100 = 0.8 .
What is f11 in Etabs?
In ETABS, shell or area element has two types of stiffnesses i.e. inplane stiffness refers as f11, f22 and f12 and out-of-plane stiffness refers as m11, m22 and m12.
What is the difference between shell and plate element?
plate elements are for out of plane forces. When there are both in plane and out of plane forces, then typically a shell element is used which is a plane stress and a plate element combined together.
What is the use of principal stress?
Values of principal stresses at a given point is vital design information. Material failure theories extensively use this data to predict whether the design will withstand given load at a specified location.
Where does maximum shear stress occur?
the neutral axis
The maximum shear stress occurs at the neutral axis and is zero at both the top and bottom surface of the beam. Shear flow has the units of force per unit distance.
How do you calculate stress points?
We calculate the stress, using the stress formula: σ = F/A = 30*10³ / (1*10⁻⁴) = 300*10⁶ = 300 MPa . Finally, we divide the stress by strain to find the Young’s modulus of steel: E = σ/ε = 300*10⁶ / 0.0015 = 200*10⁹ = 200 GPa .
What are the parameters we considered for column designing in Etabs?
There are two options to design the columns in ETABS. We can either use the “Reinforcement to be Checked” and “Reinforcement to be Designed” option.
What is master Storey in Etabs?
The ‘Master Story’ column is used to assign whether a given story is used as a template for other stories or not.