CVE-312_Ch05 Beams

CVE-312_Ch05 Beams - CVE312: Structural Steel Design: Beams...

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1 CVE312: Structural Steel Design: Beams Mohammad AlHamaydeh, Ph.D., P.E. American University of Sharjah, UAE Chapter 4: Beams Introduction Bending Stress and Plastic Moment Flexural Stability Classification of Shapes Bending Strength of Compact Shapes Bending Strength of Noncompact Shapes Summary of Moment Strength CVE312 Dr. Mohammad AlHamaydeh Shear Deflection Design of Beams Miscellaneous Topics
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2 Types of Beams Beams are members that support transverse loads. Among the many types of beams are joist lintel spandrel stringer and floor beam of beams are joists , lintels , spandrels , stringers , and floor beams . Joists are the closely spaced beams supporting the floors and roofs of buildings, while lintels are the beams over openings in masonry walls such as windows and doors. A spandrel beam supports the exterior walls of buildings and perhaps part of the floor and hallway loads. Stringers are the beams in bridge floors running parallel to the roadway Floor beams are the larger beams in many bridge floors which are CVE312 Dr. Mohammad AlHamaydeh perpendicular to the roadway of the bridge and which are used to transfer the floor loads from the stringers to the supporting girders or trusses. A Girder is a large beam and perhaps one into which smaller beams are framed. Sections Used as Beams The W-shapes will normally prove to be the most economical beam sections and they have largely replaced channels and S beam sections and they have largely replaced channels and S sections for beam usage. The W-shapes have more steel concentrated in their flanges than do S beams and thus have larger moments of inertia and resisting moments for the same weights. They are relatively wide and have appreciable lateral stiffness. CVE312 Dr. Mohammad AlHamaydeh Channels are sometimes used for beams subjected to light loads, such as purlins , and in places where clearances available require narrow flanges. They have very little resistance to lateral forces and need to be braced by sag rods.
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3 Strain Due to Bending Consider a beam segment of length L . After deformation, the length of the neutral surface remains L . At other sections,    linearly) ries (strain va  y y L y y L L y L x CVE312 Dr. Mohammad AlHamaydeh max max max 1 or c y c ρ c x Strain Due to Bending • Deformation due to bending moment M is tifi d b th t f th t l f quantified by the curvature of the neutral surface M I Mc Ec Ec c m 1 1 1 max CVE312 Dr. Mohammad AlHamaydeh EI Curvature ) (
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4 Moment-Curvature Relationship CVE312 Dr. Mohammad AlHamaydeh Bending Stress and Plastic Moment The resistance of I-sections in flexure depends on the degree of flexure depends on the degree of stability provided, locally or globally. As bending moment on
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This note was uploaded on 01/24/2012 for the course ECON 101 taught by Professor Dezhbakhsh during the Spring '07 term at Emory.

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CVE-312_Ch05 Beams - CVE312: Structural Steel Design: Beams...

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