Analysis of Concrete Construction Live Loads on Newly Poured Slabs
Publication: Journal of Structural Engineering
Volume 120, Issue 5
Abstract
The stochastic modeling of construction loads on newly poured slabs during construction of multistory concrete buildings is presented in this paper. The purpose of the study is to calculate the equivalent uniformly distributed load (EUDL), i.e., the uniform load that will produce (statistically) the same load effect in formwork members as the actual live loads. To achieve this objective the spatial correlation of construction live loads as well as the influence surfaces of various formwork member load effects must be determined. In this study, the construction live load covariance function is modeled as an exponential function. Influence surfaces for formwork shore axial forces and stringer bending moments and shear forces are also investigated for several formwork designs. The statistical moments and a distribution function for construction live load EUDLs are presented. The 0.99 fractiles of EUDLs are compared with the current design load specifications for slab formwork design. Load reduction equations are presented for slab formwork design loads.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
American Concrete Institute Committee 347. (1988). “Recommended practice for concrete formwork.” ACI 347R‐88, Amer. Concrete Inst., Detroit, Mich.
2.
American National Standard for Construction and Demolition Operations. (1983). “Concrete and masonry work safety requirements.” ANSI A10.9, Amer. Nat. Standard Inst., New York, N.Y.
3.
Ayer, F., and Cornell, C. A. (1965). “Grid maximization by mathematical programming.” J. Struct. Div., ASCE, Feb.
4.
Ayoub, H. N. (1992). “Development of probability models for concrete formwork live loads,” PhD thesis, Marquette University, Milwaukee, Wisc.
5.
Corotis, R. B. (1968). “Statistical measurement and prediction of building design loads.” MSc thesis, Massachusetts Institute of Technology, Cambridge, Mass.
6.
Ellingwood, B., and Culver, C. G. (1977). “Analysis of live loads in office buildings.” J. Struct. Div., ASCE, 103(8).
7.
Fader, D. J. (1963). “Rational considerations for the design loading of office building floor,” B Eng thesis, University of Western Ontario, London, Ontario, Canada.
8.
Hurd, M. K. (1989). “Formwork for concrete.” Special Publication No. 4, 5th Ed., American Concrete Institute, Detroit, Mich.
9.
Lew, H. S. (1976). “Safety during construction of concrete buildings—a status report.” NBS Building Sciences Series No. 80, National Bureau of Standards, Washington, D.C.
10.
Lew, H. S. (1985). “Construction loads and load effects in concrete building construction.” Concr. Int., 7(4).
11.
McGuire, R. K., and Cornell, C. A. (1974). “Live load effects in office buildings.” J. Struct. Div., ASCE, 100(7), 1351–1366.
12.
Mitchell, G. R. (1969). “Loadings on buildings.” IABSE Symp. on Concepts of Safety of Struct. and Methods of Design. International Association for Bridge and Structural Engineering Symposium, London, England.
13.
Peir, J. C. (1971). “A stochastic live load model for buildings.” Res. Report R71‐35, Dept. of Civ. Engrg., Massachusetts Inst. of Tech., Cambridge, Mass., Oct.
14.
Peir, J. C., and Cornell, C. A. (1973). “Spatial and temporal variability of live loads.” J. Struct. Div., ASCE, 99(5).
15.
Recommended safety requirements for shoring concrete formwork. (1979). Scaffolding and Shoring Institute, Cleveland, Ohio.
16.
Rosenblueth, E. (1959). “Theory of live loads in buildings.” Ingenieria, Oct.
17.
Safety and Health Regulations for Construction, 29 CFR part 1926/1910. (1983). U.S. Department of Labor, Bureau of Labor Standards, Washington, D.C.
18.
Von Karman, T. (1966). “Untersuchungen uber die Nutzlasten von Decken bei Wohngebauden.” (“Investigations of live loads on floors in residential buildings”), Osterreichische Ingenieur‐Zeitschrift, 9(4), 119–123.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 120 • Issue 5 • May 1994
Pages: 1525 - 1542
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Sep 4, 1992
Published online: May 1, 1994
Published in print: May 1994
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.