Strength Resistance to failure. Strength Types 1.Compressive strength 2.Tensile strength 3.Flexural strength 4.Shear strength 5.Torsional strength 6.Bond.

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Presentation transcript:

Strength Resistance to failure

Strength Types 1.Compressive strength 2.Tensile strength 3.Flexural strength 4.Shear strength 5.Torsional strength 6.Bond strength

Strength Compressive strength Ϭ c = 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.

Strength Tensile strength Ϭ t = 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.

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.

Strength Torsional 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=A b f s 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 Types 1.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/L K= 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