CYCLIC RESPONSE OF COMPOSITE COUPLING BEAMS

Adequate performance of coupled walls depends on sufficient stiffness, strength, and energy dissipation of coupling beams. To meet these goals, reinforced concrete coupling beams are often deep. On the other hand, shallower steel beams ca be used instead, and steel/composite coupling beams may be designed as shear-yielding members which have a more desirable energy dissipation characteristics. Such an option is not feasible for reinforced concrete beams. Well-established guidelines for links in eccentrically braced frames can be extrapolated to steel coupling beams. However, these provisions ignore the effects of concrete encasement which often surround the steel coupling beam. The reported research was conducted in an effort to fill this void. Four one-third scale subassemblages of a wall segment and a coupling beam were extracted from a prototype structure, and were tested. The main test variables were the presence or lack of concrete encasement, and the number of web stiffeners. The experimental data suggest that nominal encasement is an effective means for preventing web buckling, and stiffeners are not needed. Current design codes need to be reevaluated for the cases where the steel coupling beam is encased.

Corporate Authors:
American Concrete Institute (ACI)

38800 Country Club Drive
Farmington Hills, MI United States 48331
Authors:
- Gong, B
- Shahrooz, B M
- Gillum, A J
Publication Date: 1998

Language

English

Media Info

Features: Figures; References; Tables;
Pagination: p. 89-112
Monograph Title: HYBRID AND COMPOSITE STRUCTURES

Subject/Index Terms

TRT Terms: Beams; Composite construction; Concrete; Earthquake resistant design; Reinforced concrete; Repeated loads; Shear strength; Stiffness
Uncontrolled Terms: Concrete beams
Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

Accession Number: 00754753
Record Type: Publication
Files: TRIS
Created Date: Oct 5 1998 12:00AM