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Abstract

The seismic provisions of ACI 318–08 permit two different procedures for evaluating the need for “special” boundary elements in structural walls. The first method is based on an approximation of the maximum fiber concrete compressive stresses calculated using wall gross section properties and an assumed linear distribution of stresses over the depth. The second method places a limit on the compression zone depth of the wall. These methods are based on studies of uncoupled continuous walls, and their applicability to coupled walls is unclear. A parametric study consisting of eight coupled core wall buildings with varying geometric dimensions is presented. The states of concrete stress, strain, and compression zone depth in the wall piers at code level forces are investigated. Based on evaluation of the two procedures permitted by ACI 318–08, it is concluded that neither procedure is appropriate for wall piers in coupled core wall systems. Cross-sectional fiber analysis is a more effective evaluation tool.

Keywords

coupling beams coupled core wall systems reinforcement detailing special boundary elements structural walls wall piers

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References

ACI Committee 318. (2005). ACI 318-05/ACI 318R-0- Building Code Requirements for Structural Concrete and Commentary, American Concrete Institute. Farmington Hills MI.

AISC. (2002). Seismic Provisions for Structural Steel Buildings (a supplement to AISC Manual of Steel Construction, 3'rd Edition), American Institute of Steel Construction.

FEMA 368. (2000). NEHRP Recommended Provisions for Seismic Regulations for New Buildings and Other Structures Part 1-Provisions, 200th Edition, Federal Emergency Management Agency, Building safety Council for the Federal Emergency Management Agency.

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16.

Boundary Detailing of Coupled Core Wall System Wall Piers

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