Sage Journals: Discover world-class research

Abstract

During construction of building structures, construction load significantly greater than the self-weight of a slab, is imposed on the early-age concrete slabs. As a result, according to the construction scheme, the construction load may causes excessive long term deflection and flexural cracking in a flat plate. However, the requirement of minimum thickness of the flat plate provided by the current design codes does not address such effect of the construction load on the slab. In the present study, a simplified design method was developed to calculate the deflection of a flat plate affected by the construction load and scheme. In the proposed method, a variety of design parameters affecting the long-term deflection of the plate was considered. Based on the proposed method, a design equation for estimating the minimum thickness of the flat plate was developed to be conveniently used in design work.

Keywords

flat plate deflection minimum thickness construction load

Get full access to this article

View all access options for this article.

References

ACI Committee 435 (1991). “State-of-the-art report on control of two-way slab deflections”, ACI Structural Journal, Vol. 88, No. 4, pp. 501–514.

ACI 318–08 (2008). Building Code Requirements for Structural Concrete, American Concrete Institute, Farmington Hills, MI, USA.

Asamoah

K.O.

and Gardner

N.J.

(1997). “Flat slab thickness required to satisfy serviceability including early age construction loads”, ACI Structural Journal, Vol. 94, No. 6, pp. 700–707.

Bischoff

P.H.

(2005). “Re-evaluation of deflection prediction for concrete beams reinforced with steel and fiber-reinforced polymer bars”, Journal of Structural Engineering, ASCE, Vol. 131, No. 5, pp. 752–767.

Choi

Park

and Shin

(2003). “Moment magnifier method for long-term behavior of flat plate subjected to in-plane compression”, Journal of Structural Engineering, ASCE, Vol. 129, No. 1, pp. 87–95.

Gardner

N.J.

and Fu

H.C.

(1987). “Effect of high construction loads on the long-term deflections of flat slabs”, ACI Structural Journal, Vol. 84, No. 4, pp. 349–360.

Grundy

and Kabaila

(1963). “Construction loads on slabs with shored formwork in multistory buildings”, ACI Journal Proceedings, Vol. 60, No. 12, pp. 1729–1738.

Han

Kim

and Yang

(2000). “Effect of curing temperature and aging on the mechanical properties of concrete”, Journal of the Korea Concrete Institute, Vol. 12, No. 6, pp. 35–42.

Mosallam

K.H.

and Chen

W.F.

(1991). “Modified simplified method”. Concrete Buildings, CRC Press, Florida, USA, pp. 123–133.

10.

Rangan

B.V.

(1986). “Estimation of slab deflections in flat plate buildings”, ACI Journal Proceedings, Vol. 83, No. 2, pp. 269–273.

11.

Sbarounis

J.A.

(1984). “Multi-story flat plate buildings: Effect of construction loads on long-term deflections”, Concrete International: Design & Construction, Vol. 6, No. 4, pp. 62–70.

12.

Thompson

D.P.

and Scanlon

(1988). “Minimum thickness requirements for control of two-way slab deflections”, ACI Structural Journal, Vol. 85, No. 1, pp. 12–22.

Minimum Thickness of Flat Plate Addressing Construction Load and Scheme

Abstract

Keywords

Get full access to this article

References