A Simplified Method for the Buckling of Outrigger-Shear Wall Braced Structures

Abstract

This paper presents the analysis of the buckling of single-outrigger-shear-wall braced structures in which the shear-deformable outrigger is located at an arbitrary height. The contributions of component rigidities and the location of the outrigger to the overall stiffness of outrigger-shear-wall braced structures have been identified. A continuous model, where the exterior frames attached to the outrigger are modeled as shear-deformable-only and the action of the outrigger on the shear wall is replaced by a rotational restraint at the outrigger level, was used to analyze the buckling of single-outrigger-shear-wall braced structures. Analytical and approximate solutions are presented and compared with each other, and verification analyses were carried out using FEM. It is found that the outrigger-shear-wall braced structure may be considered as a type of dual structural system, although some of the exterior frame columns contribute to the function of the outrigger-shear-wall system. The total critical load for the outrigger-shear-wall braced structure is the sum of the critical loads for the frames and for the outrigger-shear-wall systems when they are each considered to function as independent structures. Although this paper is not intended to replace overall buckling analysis of this type of structure, the conclusion of this paper is helpful for understanding the behaviour of real outrigger-shear-wall braced structures against buckling.

Keywords

outrigger buckling frame shear wall lateral stiffness dual structural system

Get full access to this article

View all access options for this article.

References

Hoenderkamp

J.C.D.

and Bakker

M.C.M.

(2003). “Analysis of High-Rise Braced Frames With Outriggers”, The Structural Design of Tall and Special Buildings, Wiley Interscience, Vol. 12, pp. 335–350.

Hoenderkamp

J.C.D.

(2004). “Shear wall with outrigger trusses on wall and column Foundations”, The Structural Design of Tall and Special Buildings, Wiley Interscience, Vol. 13, pp. 73–87.

Hoenderkamp

J.C.D.

and Snijder

H.H.

(2000). “Simplified analysis of façade rigger braced high-rise structures”, The Structural Design Of Tall Buildings, Wiley Interscience, Vol. 9, pp. 309–319.

Hoenderkamp

J.C.D.

and Snijder

H.H.

(2003). “Preliminary analysis of high-rise braced frames with façade riggers”, Journal of Structural Engineering, ASCE, Vol. 129, No. 5, pp. 640–647.

Stafford

S. B.

and Coull

(1991). Tall Building Structures: Analysis And Design, John Wiley and Sons, Inc. pp. 355–371.

Stafford

S. B.

and Salim

(1981). “Parameter Study Of Outrigger-Braced Tall Building Structures”, Journal of the Structural Division, Vol. 107, No. 10, pp. 2001–2014.

Tong

G.S.

(2005). The in-plane stability of steel structure, China Architecture and Building Press, Beijing

Tong

G. S.

and Cao

Z.Y.

(2005). “The buckling of top-outrigger-braced frame-tube structures”, Building Structures, has been accepted for publication.

Tong

G. S.

and Ji

(2007). “Buckling of frames braced by flexural type bracing”, Journal of Constructional Steel Research, Vol. 63, No. 2, pp. 229–236.

10.

Tong

G. S.

and Wang

J. P.

(2004). “Column effective length considering the inter-story interaction”, Advances in Structural Engineering, Vol. 7, No. 5, pp. 415–425.

11.

J.R.

and Li

Q.S.

(2003). “Structural performance of multi-outrigger-braced tall buildings”, The Structural Design of Tall and Special Buildings, Vol. 12, pp. 155–176.

12.

Zeidabadi

N. A.

Mirtalae

and Mobasher

(2004). “Optimized use of the outrigger system to stiffen the coupled shear walls in tall buildings”, The Structural Design of Tall and Special Buildings, Wiley Interscience, Vol. 13, pp. 9–27.

13.

Kollar

(1999). Structural Stability in Engineering Practice, EandFN Spon, London, ISBN 0-419-23790-9.

14.

Zalka

K.A.

(2000). Global Structural Analysis of Buildings, EandFN Spon, London, ISBN 0-415-23483-2