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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 16 Abstracts search results
September 20, 2010
Trevor J. Kirkpatrick and Robert B. Anderson
This example demonstrates strut-and-tie principles to design an internal diaphragm for an extradosed cable stayed bridge with a cast-in-place segmental box girder. The diaphragm carries vertical shear from the webs of the box girder around access openings to the indirect bearings on a tower strut. Several models are investigated before the design model is presented. Tie forces are determined, and reinforcing steel is selected. A computer program is introduced to perform the detailed (and often iterative) stress checks for the struts and nodal zones, and sample calculations for the struts and nodal zone stresses are provided.
Widianto and Oguzhan Bayrak
In industrial structures, deep pile-caps are commonly used. Two approaches (sectional design and Strut-and-Tie Model (STM) design) are presented for designing deep pile-caps under a combination of axial load, shear, and moment that produces tension in some piles. The sectional design method is similar to that used for traditional design of thin slabs or slender footings using the ACI 318 Building Code. Several potential problems with the sectional design approach based on ACI 318 Code for deep pile-caps are discussed. The differences in designing and detailing of final reinforcement based on the sectional design and the STM design are discussed.
Editors: Karl-Heinz Reineck and Lawrence C. Novak / Sponsored by Joint ACI-ASCE Committee 445
This Special Publication contains 15 papers that were presented at technical sessions sponsored by Joint ACI-ASCE Committee 445, Shear and Torsion, at the 2010 ACI Spring Convention in Chicago, IL. Topics covered in the papers include an introduction to the method, design examples, common problems experienced in real design applications, additional guidance for use the strut-and-tie model (STM), and an assessment of existing requirements.
Note: The individual papers are also available. Please click on the following link to view the papers available, or call 248.848.3800 to order.
Hakim Bouadi and Asif Wahidi
Utilizing the real world project of a 6-story tall reinforced concrete building located in a moderate seismic zone, this example demonstrates the design of coupling beams (or as often named link beams) by application of the strut and tie provisions of ACI 318 Appendix A. A coupling beam with a moderate shear level and a 2nd coupling beam with a high shear levels are designed. The former beam is designed using longitudinal and web reinforcement while the latter utilizes diagonal reinforcement. For demonstration purposes, the beam design utilizing diagonal reinforcement incorporates parts of ACI 318-08 chapter 21.9; however, for moderate seismic zones, section 21.9 need not apply.
Matthias F. Andermatt and Adam S. Lubell
A simply supported stepped beam having multiple disturbed regions is designed. The beam, consisting of a 3’-5” (1041 mm) cantilever span and a 16’-10” (5131 mm) back-span, is required to support an intensive green roof on the tenth floor of a 14 storey office building. The cantilever and part of the back-span support the roof. The remainder of the back-span is 16” (406 mm) deeper and supports the office floor. The beam is subjected to tributary area loads from the green roof and the offices. A spandrel beam is indirectly supported on the cantilever section of the stepped beam. Since the disturbed regions at the column supports, indirect support, and at the step render the majority of the beam as disturbed, the entire beam is designed using strut-and-tie models in accordance with Appendix A of ACI 318-08. This design example considers multiple load combinations resulting in different strut-and-tie truss analysis models.
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