Sanjer Bela Civil Engineering Site

Q) Explain the various modes of failure encountered in prestressed concrete beams subjected to bending moment shear and torsion. Prestressed concrete beams subjected to combined bending, shear, and torsion fail through distinct modes categorized by their dominant cause: flexural tension/compression, shear cracking (diagonal tension/compression), or torsional cracking. Modes of Failure in Prestressed Concrete Beams Flexural Failure (Bending): Fracture of Steel (Under-reinforced): Occurs when the prestressing steel yields or fractures before the concrete crushes. The beam undergoes large deflections, providing warning. Compressive Failure (Over-reinforced): Occurs when the concrete in the compression zone crushes before the steel yields. This is sudden and brittle. Failure due to Premature Yielding: Occurs when, if the concrete in the tension zone cracks, the strength of the beam relies completely on the reinforcement, leading to rapid steel yielding. Shear Failure: Diagonal Tension ...

  what is torque and torsion? what is the difference between torque and torsion? The terms torque and torsion are related to rotational forces, but they describe different concepts: Torque : Torque refers to a force that causes an object to rotate around an axis or pivot point. It is the measure of the rotational force applied to an object. The formula for torque is: τ=F×r×sin⁡(θ)\tau = F \times r \times \sin(\theta)τ=F×r×sin(θ) where τ\tauτ is the torque, FFF is the force, rrr is the distance from the pivot point, and θ\thetaθ is the angle between the force vector and the lever arm. Torque is typically used in situations where a force is applied at a distance from a center of rotation (like turning a doorknob or the engine in a car). Torsion : Torsion refers to the twisting of an object due to an applied torque. It describes the stress and strain experienced by a material when it is subjected to ro...