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Section 3 / beams, frames, and columns

Beams, Frames, and Columns

Section properties, shear flow, bending stress, torsion, column buckling, crippling, and interaction ratios.

01

36 tabulated beam cases with superposition: reactions, shear, moment, slope, deflection and stresses, plus layered and bimetallic beams.

A supported beam with a load, its reactions and the shear and moment diagrams.
Open Classical Beam Solutions → 🔒 Login required
05

Tie-rod / strut axial-member analysis: tension yield/ultimate margin, Euler/Johnson column buckling stability, and end-fitting (lug or thread) allowable-load check, with full graphics.

Tie rod strut diagram
Open Tie Rod / Strut Analysis → 🔒 Passcode required — use site passcode
06

Beam shear, bending moment and deflection with margins for cantilever, simply supported and fixed-fixed beams under point or uniform load.

Beam with support triangles, a load arrow and a deflected shape.
Open Beam Bending & Deflection → 🔒 Login required
07

Beam-column interaction: secant moment amplification under axial compression with lateral load or end moments, stress and interaction margin.

Column bent under axial and lateral load.
Open Beam-Column Interaction → 🔒 Login required
08

Thin-wall torsion of closed tubes and boxes: shear stress, twist and stiffness, compared with the open-slit section.

Closed tube and box cross-sections under torque.
Open Thin-Wall Torsion → 🔒 Login required
10

Column buckling with the Johnson-Euler curve and the secant formula for eccentricity, plus an element-by-element local buckling and crippling estimate.

Column bending under compression with a column curve.
Open Column Buckling & Crippling → 🔒 Login required
11

Moment-curvature bending past yield with a Ramberg-Osgood curve: stress, strain, plastic modulus and moment capacity.

A beam section with elastic and plastic stress blocks.
Open Plastic Bending → 🔒 Login required
12

Reactions, bearing stress and bending margin for a beam held in a socket and loaded sideways.

A beam embedded in a socket with a sideways load.
Open Beam in a Socket → 🔒 Login required
14

Member forces, stresses and buckling margins for a two-bar pin-jointed truss loaded at the shared joint.

A two-bar truss with a load at the shared joint.
Open Two-Member Truss → 🔒 Login required
15

First three bending natural frequencies of a uniform cantilever, simply supported or fixed-fixed beam, with tip mass on a cantilever.

A beam vibrating in its first bending mode.
Open Beam Natural Frequency → 🔒 Login required
16

First-yield and fully plastic torque, shape factor and twist of a solid round bar or tube, with margins.

A round bar in torsion with the shear stress across the section.
Open Plastic Torsion → 🔒 Login required
17

Reactions, support and span bending moments and bending stress of a beam on three supports with uniform loads on each span.

A two-span beam on three supports with a bending moment diagram.
Open Two-Span Continuous Beam → 🔒 Login required
18

Deflection, moment and support pressure for a long beam on a continuous elastic foundation under a point load.

A beam resting on a continuous elastic support.
Open Beam on Foundation → 🔒 Login required
19

Peak stress, Euler load and load to first yield for an eccentrically loaded column by the secant formula.

A column loaded off its axis.
Open Eccentric Column → 🔒 Login required
20

Torsion constant, peak shear stress and twist for an open section built of thin strips such as an angle or channel.

A channel section in torsion.
Open Open Section Torsion → 🔒 Login required
24

Amplified moment, deflection and stress of a pin-ended beam under axial compression and transverse load.

A beam carrying compression and sideways load.
Open Beam-Column → 🔒 Login required
25

Inside and outside fiber bending stress and neutral axis of a curved beam of rectangular section.

A curved beam, such as a hook.
Open Curved Beam Stress → 🔒 Login required
26

Area, second moments, moduli and radii of gyration for rectangle, circle, tube, box and I sections.

Common cross-section shapes.
Open Standard Sections → 🔒 Login required
28

Peak and average shear stress from a transverse force in common beam sections, with margin.

A beam section with the shear stress shown across the depth.
Open Beam Shear Stress → 🔒 Login required
33

End moments, reactions and span moment of a fixed-fixed beam under common loads.

A beam fixed at both ends under load.
Open Fixed-End Beam → 🔒 Login required
34

Peak shear stress, torsion constant and twist of a solid rectangular bar under torque.

A rectangular bar twisting under torque.
Open Rectangular Torsion → 🔒 Login required
35

Bending stress at a point of a section loaded about both axes with a product of inertia, and the neutral axis angle.

A section loaded about both axes with a tilted neutral axis.
Open Unsymmetric Bending → 🔒 Login required
36

Worst bending moment and shear on a simple span as a pair of loads crosses it.

A beam with two wheel loads traveling across it.
Open Moving Load Beam → 🔒 Login required
37

Bending stress, deflection and rate of a semi-elliptic leaf spring under a center load.

A stack of leaves forming a leaf spring with a center load.
Open Leaf Spring → 🔒 Login required
38

Reactions, shear, moment, stress and deflection of a beam with several point loads.

A simply supported beam with several point loads.
Open Beam Point Loads → 🔒 Login required