KEVOS® MAKEOS · Mechanics
Wall Jib Crane Check (Tie Tension, Beam Bending and Axial Stress, Deflection, Wall Bolts)
For a wall-mounted jib with a tie rod, how much tension is in the tie, are the beam stress and deflection within limits, and can the top wall bolts take the pull?
Check of a wall jib crane with a pinned I-section jib supported at its outer end by a tie: the section area, second moment and section modulus of the jib (as the section shapes tool), the tie tension and beam compression with the load at the end, the bending moment and deflection with the load at mid-reach (as the beam cases tool for a central point load), the combined bending and axial stress, the tie rod stress, and the wall pull shared by the top bolts, against your allowable stresses, deflection limit and bolt capacity.
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How this tool works
Inputs, units and where to find them
| Input | Unit | Typical source |
|---|---|---|
| Load including hoist and trolley | N | Rated load plus hoist, trolley and an allowance for dynamic effects. |
| Reach (wall pin to tie point) | mm | Distance from the wall pin to where the tie meets the jib. |
| Tie angle from the jib | ° | Angle between the tie and the jib. |
| Jib section (I) | ||
| Overall depth | mm | Overall depth of the jib section. |
| Flange width | mm | Flange width. |
| Flange thickness | mm | Flange thickness. |
| Web thickness | mm | Web thickness. |
| Modulus of elasticity | GPa | Modulus of elasticity. |
| Allowable combined stress | MPa | Allowable combined bending and axial stress. |
| Deflection limit (reach ÷) | Largest deflection as a fraction of the reach. | |
| Tie and wall | ||
| Tie rod diameter (at the thread root) | mm | Tie rod diameter at its weakest section (thread root). |
| Allowable tie stress | MPa | Allowable tensile stress in the tie. |
| Top bracket bolts in tension | bolts | Bolts at the top wall bracket that take the tie’s horizontal pull. |
| Allowable tension per bolt | N | Allowable tension in each wall bolt or anchor. |
Method and formulas
- A, I and Z of the I-section (as the section shapes tool).
- Load at the end: tie T = W ÷ sin θ; wall pull = T cos θ. Load at mid-reach: M = W L ÷ 4 and deflection W L³ ÷ 48EI (as the beam cases tool), with axial compression W cos θ ÷ (2 sin θ).
- Combined stress = M ÷ Z + N ÷ A; tie stress = T ÷ (π d² ÷ 4); bolt load = wall pull ÷ bolts.
- Example: tie 20 kN; jib 43.816 MPa and 1.5239 mm deflection; 4,330.1 N per wall bolt.
Limitations
- Pinned jib and tie, load on the jib centre line; lateral-torsional buckling of the jib and trolley wheel loads on the flange are not checked.
- Static load including the dynamic allowance you add to it.
- Example values are illustrations. Replace them with values for your actual task.
Typical uses
- Check a workshop wall jib
- Size the tie rod and wall bolts
- Check a jib for a heavier hoist
Who it is for
- Design engineers
- Maintenance engineers
- Structural detailers
What you get
- Jib section properties
- Tie tension, beam moment, stresses and deflection
- Tie rod and wall bolt checks
Interpreting the result
- A steeper tie (larger angle) cuts the tie tension and the jib compression sharply.
References
- Machinery’s Handbook, 29th edition (Industrial Press, 2012), printed pp. 234–246, 257–277, 153–163. Topic reference; no source tables or recommended settings are reproduced.
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