strength resistance to failure. strength types 1.compressive strength 2.tensile strength 3.flexural...
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Strength
• Resistance to failure
Strength
Types
1. Compressive strength
2. Tensile strength
3. Flexural strength
4. Shear strength
5. Torsional strength
6. Bond strength
StrengthCompressive strength
Ϭc = P/A
P= Load
A= Area of x-section
It is the resistance to failure, when the applied stress is normal / perpendicular to the area of X-section.
StrengthTensile strength
Ϭt = P/A
It is the resistance to failure, when the applied stress is normal / perpendicular to the area of X-section.
Strength
Shear strength
It is the resistance to failure, when the applied stress is parallel to the area of X-section.
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Strength
Flexural strength
Ϭ = My/ I
M= Applied moment
Y= Distance from NA
I= Moment of inertia
It is the resistance to failure, when the applied stress is a combination of tensile and compressive stress forming a couple.
StrengthTorsional strength
It is the resistance to failure, when the applied torque tries to twist the body producing torsional stresses.
Bond Strength
• Bond stress=U: Shear stress at steel concrete interface
• It is the resistance to failure, when the applied stress tries to pull the steel bar out of the concrete.
T=Abfs
U=change of bar force/surface area of bar
Steel bar
concrete
Bond Strength
Pull out test
Stiffness
Resistance to deformation
Depends upon
• Material
• Area of X-section, Moment of inertia
• Length
This property is dependent upon material behaviour and geometry of the
structural element
Stiffness
Types1. Bending/ Flexural stiffness
2. Axial Stiffness
Bending stiffness is used for beams etc
Axial stiffness for trusses or columns
Stiffness
Bending Stiffness
• Material• Moment of inertia• Length
= K EI/LK= depends upon support conditions
Stiffness
Axial Stiffness
• Material
• Area of X-section
• Length
K = EA/L
K= depends upon end conditions
Elasticity• Resistance to deformation
Ductility and brittleness• Deformation before failure
Hardness
• Resistance to penetration or wear
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