TECHNICAL PAPERS
Nov 1, 1990

Column Load Balancing in Prestressed Concrete Building

Publication: Journal of Structural Engineering
Volume 116, Issue 11

Abstract

Architectural and structural considerations in the design of the 27‐story Wisma Dharmala office complex in Jakarta lead to the deployment of twincolumn clusters around the perimeter and interior of the tower block. Due to the large difference in axial loads between the twin columns, excessive differential axial shortening between the columns and high shear stresses in the connecting horizontal structural components are expected. To mitigate this condition, the column load balancing method is proposed, in which the cable profiles in the prestressed girders are designed not only for moment balancing but also to transfer evenly the shear forces in the girders to the twin columns in each cluster. The effect of load balancing is examined in this paper with the use of a simple analytical model. The predicted loads on the columns are also checked against field measurements taken from three pairs of twin columns from the time the columns are cast until the casting of the helipad floor.

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References

1.
Agarwal, R. K., and Gardner, N. J. (1974). “Form and shore requirements for multistory flat slab type buildings.” J. American Concrete Inst., 71(11), 559–569.
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Grundy, P., and Kabaila, A. (1963). “Construction loads on slabs with shored formwork in multistory buildings.” J. American Concrete Inst., 60(12), 1729–1738.
3.
Lasisi, M. Y., and Ng, S. F. (1979). “Construction loads imposed on high‐rise floor slabs.” Concrete Int., 1(2), 24–29.
4.
Lin, T. Y., and Burns, N. H. (1981). Design of prestressed concrete structures. 3rd Ed., John Wiley and Sons, Inc., New York, N.Y.
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Nielsen, and Knud, E. C. (1952). “Loads on reinforced concrete floor slabs and their deflection during construction.” Bulletin No. 15, Swedish Cement and Concrete Res. Inst., Royal Inst. of Tech., Stockholm, Sweden.
6.
Nilson, A. H. (1978). Design of prestressed concrete. John Wiley and Sons, Inc., New York, N.Y.
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“Recommended practice for concrete formwork.” (1978). (ACI 347‐78) American Concrete Inst., Detroit, Mich.
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Tumilar, S. (1987). “Column load balancing in prestressed concrete building,” thesis presented to the National University of Singapore, at Kent Ridge, Singapore, in partial fulfillment for the requirements for the degree of Master of Engineering.

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Published In

Go to Journal of Structural Engineering
Journal of Structural Engineering
Volume 116Issue 11November 1990
Pages: 3077 - 3089

History

Published online: Nov 1, 1990
Published in print: Nov 1990

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Authors

Affiliations

S. L. Lee, Fellow, ASCE
Prof. and Head, Dept. of Civ. Engrg., Nat. Univ. of Singapore, Kent Ridge, Singapore
S. Tumilar, Member, ASCE
Mgr., Struct. Design Dept., Wiratman and Assoc., Jakarta, Indonesia
H. C. Chin
Sr. Lect., Dept. of Civ. Engrg., Nat. Univ. of Singapore, Kent Ridge, Singapore

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