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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 16 Abstracts search results
Document:
SP-273
Date:
September 20, 2010
Author(s):
Editors: Karl-Heinz Reineck and Lawrence C. Novak / Sponsored by Joint ACI-ASCE Committee 445
Publication:
Symposium Papers
Volume:
273
Abstract:
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. SP-273
DOI:
10.14359/51682323
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
SP273-07
Gary J. Klein
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.
10.14359/51682295
SP273-08
Katrin Habel, Matthias F. Andermatt, and Adam S. Lubell
The load carrying capacity of the hinge region of an existing highway overpass is evaluated using the strut-and-tie modeling techniques of ACI 318-08 Appendix A. The overpass consists of a series of drop-in span girders supported at the center by doubly cantilevered pier girders. The hinge is achieved through the use of an incorporated steel piece, the so-called Cazaly hanger, in the ends of the span girders. This example examines the disturbed end regions of both the span girders and the pier girders. The strut-and-tie model demonstrates how the Cazaly hanger can be incorporated into the model. In addition, the girders are prestressed which is taken into account by modeling the prestressing as equivalent forces applied to the concrete. This example demonstrates how to evaluate the load carrying capacity of an existing concrete structure and how to develop a strut-and-tie model based on the existing reinforcement configuration.
10.14359/51682296
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