Beam

Front 1

A formula defining the relationship between bending moment, bending stress and the cross sectional properties of a beam. Bending stress is directly proportional to bending moment and inversely proportional to the moment of inertia of a beam section.

Back 1

FLEXURE FORMULA

Hint 1

Front 2

The buckling of a structural member unduced by compressive stresses acting on a slender portion insufficiently rigid in lateral direction.

Back 2

LATERAL BUCKLING

Front 3

The tensile and compressive stresses resulting from the interaction of bending and shear stresses at a cross section of a beam.

Back 3

PRINCIPAL STRESSES

Front 4

Lines depictIng the direction but not the magnitude of the principal stresses in a beam.

Back 4

STRESS TRAJECTORIES

Front 5

The point in the crosssectional plane of a structural member through which a transverse load must pass in order to prevent tortion or twising of the member about a logitudinal axis.

Back 5

SHEAR CENTER

Hint 5

Front 6

A graphic representation of the variation inmagnitude of the external shears present in a structure for a given set of transverse loads and support conditions.

Back 6

SHEAR DIAGRAM

Front 7

A graphic representation of the variation in magnitude of bending moments present in a structure for a given set of transverse loads and support conditions. The overall deflected shape of a structure subject to bending can often be inferred from the shape of this.

Back 7

MOMENT DIAGRAM

Front 8

A beam resting on simple support at both ends, which are free to rotate and have no moment resistance. As with any statically determine structure, the values of all reactions, shears and moments for this beam are independent of its cross sectional shape and material.

Back 8

SIMPLE BEAM

Front 9

A projecting beam supported at only one fixed end.

Back 9

CANTILEVER BEAM

Hint 9

Front 10

A beam or other rigid structural member extending beyond a fulcrum and supported by a balancing member or a downward force between the fulcrum

Back 10

CANTILEVER

Front 11

_________ is the net resultant shear forces that acts vertically UPWARD on the left part of the structure being considered.

and

_________ is the net resultant shear forces that acts vertically DOWNWARD on the left part of the structure being considered.

Back 11

POSITIVE SHEAR

and

NEGATIVE SHEAR

Front 12

A bending moment that produces a CONCAVE curvature at a section of a structure.

Back 12

POSITIVE MOMENT

Hint 12

Front 13

A point a which a structure changes curvature from convex to concave or vice versa as it deflects under a transverse load: theoretically an internal hinge and therefore a point of zero moment.

Back 13

INFLECTION POINT

Hint 13

Front 14

A bending moment that produces a CONVEX curvature at a section of a structure.

Back 14

NEGATIVE MOMENT

Hint 14

Front 15

A part of the beam that is thickened or deepend to develop greater moment of resistance. The efficiency of a beam can be increased by shaping its length in response to the moment and shear values which typically vary along its longitudinal axis.

Back 15

HAUNCH

Hint 15

Front 16

A simple beam supported by cantilevers of two adjoining spans with pinned construction joints at points of zero moment. Also called hung-spun.

Back 16

SUSPENDED-SPAN

Front 17

A beam extending over more than two supports in order to develop greater rigidity and smaller moments than a series of simple beams having similar spans and loading. Both fIxed-end and continuous beams are indeterminate structures for which the values of all reactions, shears, and moments are dependent not only on span and Ioading but also on cross-sectlonalshape and material.

Back 17

CONTINUOUS BEAM

Front 18

The distance between inflection points in the span fixed-end or continuous beam equivalent in nature to the actual length of 3 simply supported beams.

Back 18

EFFECTIVE LENGTH

Front 19

A beam having both ends restrained againts translation and rotation. The fixed ends transfer bending stresses. Increase the rigidity of the beam, and reduce its maximum deflection.

Back 19

FIXED-END BEAM

Front 20

A simple beam extending beyond one its supports. The overhang reduces the positive moment at midspan while developing a negative moment at the base of the cantilever over the support.

Back 20

OVERHANGING BEAM

Front 21

A simple beam extending beyond both of its supports.

Back 21

DOUBLE OVERHANGING BEAM

Front 22

A rigid structural member designed to carry and transfer transverse loads across space to supporting elements.

Back 22

BEAM

Front 23

The extent of space between two supports of a structure. Also, the structure so supported.

Back 23

SPAN

Front 24

The distance between the inner faces of the supports of a span.

Back 24

CLEAR SPAN

Front 25

The center-to-center distance between the supports of a span.

Back 25

EFFECTIVE SPAN

Front 26

An external moment tending to cause part of a structure to rotate or bend, equal to the algebraic sum of the moments about the nuetral axis of the section under consideration.

Back 26

BENDING MOMENT

Hint 26

Front 27

An internal moment equal and opposite to a bending moment, generated by a force couple to maintain equilibrium of the section being considered.

Back 27

RESISTING MOMENT

Front 28

The perpendicular distance a spanning member deviates from true course under transverse loading, increasing with load and span, and decreasing with an increase in moment of inertia of the section or modulus of elasticity of the material.

Back 28

DEFLECTION

Front 29

A slight convex curvature intentionally built into a beam, girder, or truss to compensate for an anticipated deflection.

Back 29

CAMBER

Front 30

An external shear or force at a cross section of a beam or other member subject to bending, equal to the algebraic sum of transverse forces on one side of the section.

Back 30

TRANSVERSE SHEAR

Front 31

The shearing stress developed to prevent slippage along longitudinal planes of a beam under transverse loading, equal at any point to the vertical shearing stress at that point. Also called longitudinal sheraing stress.

Back 31

HORIZONTAL SHEARING STRESS

Front 32

An imaginary line passing through the centroid of the cross section of a beam or other member subject to bending, along which no bending stresses occur.

Back 32

NEUTRAL AXIS

Front 33

A combination of compressive and tension stresses developed at a cross section of structural member to resist a transverse force, having a maximum value at the surface furthest from neutral axis.

Back 33

BENDING STRESS

Front 34

The shearing stress developed along across section of a beam to resist transverse shear, having a maximum value at the neutral axis and decreasing nonlinearly toward the outer faces.

Back 34

VERTICAL SHEARING STRESS