12_Bridges-BasicStructuralConsiderations-Sept.2015.ppt.pptVIP

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Simple Beams - Curvature Positive Curvature Continuous Beams - Curvature Positive Curvature Positive Curvature Negative Curvature Simple Beams – Bending Stresses Bending Stresses Continuous Beams – Bending Stresses Bending Stresses Beams – Horizontal Shear Stress Horizontal Shear Stress Beams – Horizontal Shear Stress Beams – Vertical Shear Stress Shear Stresses Beams – Vertical Shear Stress Tension Stresses Strain It is described as the amount of deformation. It denotes the ratio of material’s deformed dimension to its original dimension. L ΔL Strain = ΔL/L Deformation Modulus of Elasticity Elastic Deformation - It is reversible distortion of a material. Plastic Deformation – It is the irreversible distortion of a material. Modulus of Elasticity (E) = Stress/Strain Stress in Steel SHORTEN LENGTHEN TENSION COMPRESSION YIELD STRESS YIELD STRESS Stress in Steel KINK Buckling of Steel Members Steel members are normally made up of slender components. Slender compression members are susceptible to buckling. Mis-aligned member in compression lowers the load at which it buckles. Stress in Concrete SHORTEN LENGTHEN TENSION COMPRESSION STRESS Stress in Concrete TENSION CRACK Stress in Concrete TENSION CRACK (Typ) REINFORCING STEEL Stress in Concrete SHEAR CRACK (Typ) REINFORCING STEEL TENSION CRACKS Stress in Concrete CONCRETE BEAM HIGH STRENGTH STEEL Stress in Concrete CONCRETE BEAM DEFLECTED UPWARD HIGH STRENGTH STEEL Prestressed Concrete C T T T C T C C C Stress in Timber Stress in Timber TENSION CRACK INITIATED AT KNOT Stress in Timber HORIZONTAL SHEAR CRACK Stress in Timber CRUSHING AT SUPPORTS TIMBER CAPS TIMBER PILES TIMBER BEAM END * * * * * * * BIM Bridge Inspection and Maintenance Bridge Structural Considerations BIM Bridge Inspection and Maintenance Technical Standards Branch Class B Bridge Inspection Course Bridge Structural Considerations BIM Bridge Inspection and Maintenance Br