![]() ![]() The shear force diagram will increase or decrease suddenly i.e., by a vertical straight line at a section where there is a vertical point load.The positive values of shear force and bending moments are plotted above the base line, and negative values below the base line.Consider the left or the right portion of the section.Important Points for Drawing Shear Force and Bending Moment Diagrams If moving from left to right, take clockwise moment as positive and anticlockwise as negative.Or if forces are forming sagging moment then it is taken as positive and if forces are forming hogging moment then it is taken as negative. Or if the shear force tries to rotate the element clockwise then it is takes as positive & if the shear force tries to rotate the element anticlockwise then it is takes as negative. If moving from left to right, then take all upward forces as positive and downward as negative. Sign Conventions for Shear Force and Bending Moment Load spread over a beam, rate of loading varies from point to point along the beam Load spread over a beam, rate of loading w is uniform along the length The following are the important types of load acting on a beam: (vi) Continuous beam: More than two supports (iii) Cantilever beam: Beam fixed at one end and free at other (i) Simply supported beam: A beam with two simple supports Statically Indeterminate Beam: When the number of unknown reaction components exceeds the static conditions of equilibrium, the beam is said to be statically indeterminate.Statically Determinate Beam: A beam is said to be statically determinate if all its reaction components can be calculated by applying three conditions of static equilibrium.Note: The distance between two supports is known as “span”. (b) Hinge support or pin connection – resists horizontal and vertical forces (a) Roller Support – resists vertical forces only Clamped Supports (or) Built-in Supports.Shear force at a cross section of beam is the sum of all the vertical forces either at the left side or at the right side of that cross section.īending moment at a cross section of beam is the sum of all the moments either at the left side or at the right side of that cross section. Due to those transverse shear loads, beams are subjected to variable shear force and variable bending moment. A Beam is defined as a structural member subjected to transverse shear loads during its functionality. ![]()
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