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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
Document:
SP273-07
Date:
September 20, 2010
Author(s):
Gary J. Klein
Publication:
Symposium Papers
Volume:
273
Abstract:
This example describes the design of the support region of dapped-end double-tee beam, the type of beam typically used in parking structures. The strut-and-tie model (STM) employs curved-bar nodes, the bend region of a continuous reinforcing bar (or bars) whose straight extensions form two ties in a strut-and-tie model.
DOI:
10.14359/51682295
SP273-05
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.
10.14359/51682293
SP273-11
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.
10.14359/51682299
SP273-12
Richard J. Beaupre, Robert B. Anderson, and Velvet Bridges
This example demonstrates strut-and-tie principles to design an internal diaphragm for a segmental concrete girder bridge. The diaphragm carries vertical shear and torsion from the webs of the box girder around the access opening to the bearings on the pier cap. Tie forces are determined, and reinforcing steel is selected. Stress checks for the struts and nodal zone are provided.
10.14359/51682300
SP273-01
Robin G. Tuchscherer, Michael D. Brown, and Oguzhan Bayrak
The design of a hammerhead bent cap is presented. The design is performed according to the ACI 318 Appendix A Strut-and-Tie Modeling (STM) provisions. The objective of this paper is to present a design example for designers who do not have a large amount of experience with strut-and-tie modeling. Strut-and-tie modeling is relatively new to ACI 318 as provisions were first included in the 2002 edition. The procedure may be used for the design of both reinforced and prestressed concrete structures. The following example is intended to supplement the basic example problems available in textbooks. For additional background information, a review of textbook-level material [ACI SP 208 (2002), Schlaich et al. (1987)] is recommended.
10.14359/51682289
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