Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

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Shores and Scaffolding 183
The form designer must perform an analysis of all loads, including
construction loads, form loads, and dead loads of slabs based on
the number of stories of shoring and reshoring. The results of the
analysis must be compared to the allowable load on the slabs based
on the ultimate design load capacity, multiplied by the percentage of
strength and divided by a safety factor. The comparison of the load
analysis to the allowable load must be performed at any stage during
construction. The local punching shear in the slab under heaviest
shore load must also be checked.
Numerous repetitive calculations are required to analyze shoring.
The Scaffolding, Shoring, and Forming Institute offers a computer
program for execution on a personal computer for performing such
calculations.
Thus, shoring and reshoring of multistory structure represents
special conditions, particularly in relation to removal of forms and
shores. The decision regarding the safe condition for removal of
shores should be made by a competent engineer-architect in cooperation
with the structural designer of the concrete structure.
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References
1. Dayton Superior Corporation, Parsons, KS.
2. EFCO, Economy Forms Corporation, Des Moines, IA.
3. Ellis Construction Specialties, Ltd, Oklahoma City, OK.
4. Patent Construction Systems, Paramus, NJ.
5. Safway Steel Products, Milwaukee, WI.
6. Scaffolding, Shoring, and Forming Institute, Inc., Cleveland, OH.
7. Symons Corporation, Des Plaines, IL.
8. Scaffolding & Shoring Institute, Cleveland, OH.
9. X. L. Liu, H. M. Lee, and W. F. Chen, “Analysis of Construction Loads on
Slabs and Shores by Personal Computer,” Concrete International: Design
and Construction, Vol. 10, No. 6, Detroit, MI, 1988.
10. “Formwork for Concrete,” Special Publication No. 4, 7th ed., American Concrete
Institute, Detroit, MI, 2004.
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