👉Bending Moment, Shear Force & Axial Load
📌 1. Basic Definitions
• Axial Load acts along the member’s longitudinal axis (tension or compression).
• Shear Force resists sliding of one part of a section relative to another.
• Bending Moment causes curvature or rotation within a structural element.
📌 2. Axial Load Effects
• Compression shortens and thickens members like columns and struts.
• Tension elongates and thins structural elements like ties or cables.
• Axial force affects buckling behavior, especially in slender columns.
• Design is checked per EBCS axial load capacity formulas (ask if needed).
• Common in trusses, frame members and wall panels in Ethiopia.
📌 3. Shear Force Effects
• Acts parallel to the cross-section, causing diagonal cracks in beams.
• High near supports and load application points in simply supported beams.
• Controlled by web reinforcement or stirrups in RC beams (per EBCS-2).
• Ethiopian contractors often under-reinforce shear zones—strict inspection needed.
• Shear failure is sudden and brittle—must be avoided in critical elements.
📌 4. Bending Moment Effects
• Caused by external loads or support reactions creating rotation.
• Maximum at mid-span in simply supported beams under uniform load.
• Positive moment causes sagging, negative causes hogging (upward curve).
• Bending reinforcement placed at tension face (bottom for sagging).
• Key in slab design, bridge girders and cantilever balconies in Ethiopia.
📌 5. Combined Actions in Members
• Real structures often experience all three actions simultaneously.
• Column with axial load + moment → becomes eccentrically loaded.
• Beams in frames carry bending + shear and sometimes axial thrust.
• Load interaction checked using interaction diagrams (from EBCS charts).
• Bridge design uses envelopes for max/min moment and shear.
📌 6. Practical Ethiopian Applications
• In telecom towers, tension members carry axial loads from guy wires.
• Local practice must align with EBCS design limits for safety.
• Engineers must also consider workmanship—poor concrete leads to failure.
Don't forget to share!
@etconp
📌 1. Basic Definitions
• Axial Load acts along the member’s longitudinal axis (tension or compression).
• Shear Force resists sliding of one part of a section relative to another.
• Bending Moment causes curvature or rotation within a structural element.
📌 2. Axial Load Effects
• Compression shortens and thickens members like columns and struts.
• Tension elongates and thins structural elements like ties or cables.
• Axial force affects buckling behavior, especially in slender columns.
• Design is checked per EBCS axial load capacity formulas (ask if needed).
• Common in trusses, frame members and wall panels in Ethiopia.
📌 3. Shear Force Effects
• Acts parallel to the cross-section, causing diagonal cracks in beams.
• High near supports and load application points in simply supported beams.
• Controlled by web reinforcement or stirrups in RC beams (per EBCS-2).
• Ethiopian contractors often under-reinforce shear zones—strict inspection needed.
• Shear failure is sudden and brittle—must be avoided in critical elements.
📌 4. Bending Moment Effects
• Caused by external loads or support reactions creating rotation.
• Maximum at mid-span in simply supported beams under uniform load.
• Positive moment causes sagging, negative causes hogging (upward curve).
• Bending reinforcement placed at tension face (bottom for sagging).
• Key in slab design, bridge girders and cantilever balconies in Ethiopia.
📌 5. Combined Actions in Members
• Real structures often experience all three actions simultaneously.
• Column with axial load + moment → becomes eccentrically loaded.
• Beams in frames carry bending + shear and sometimes axial thrust.
• Load interaction checked using interaction diagrams (from EBCS charts).
• Bridge design uses envelopes for max/min moment and shear.
📌 6. Practical Ethiopian Applications
• In telecom towers, tension members carry axial loads from guy wires.
• Local practice must align with EBCS design limits for safety.
• Engineers must also consider workmanship—poor concrete leads to failure.
Don't forget to share!
@etconp
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