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International Concrete Abstracts Portal

Showing 1-5 of 16 Abstracts search results

Document: 

SP273-10

Date: 

September 20, 2010

Author(s):

Daniel Kuchma, Sukit Yindeesuk, and Tjen Tjhin

Publication:

Symposium Papers

Volume:

273

Abstract:

This example presents a strut-and-tie design for a storey-high propped cantilever beam that supports a single concentrated load near midspan and has a large rectangular opening between this point of loading and the fixed-ended support. The internal truss that is selected to carry the imposed loading to the supports is both externally and internally indeterminate. This creates a condition in which the calculated capacity of the STM designed region is affected by the relative stiffness of truss members and the degree of plasticity attributed to the truss. The design is investigated and validated by plastic and non-linear truss analyses, finite element analysis, and the results from a scale model test of the designed structure. This paper examines the influence of design and analysis assumptions on the performance of this structure under service and factored loads.

DOI:

10.14359/51682298


Document: 

SP273-03

Date: 

September 20, 2010

Author(s):

Leonard P. De Rooy, Timothy C. DenHartigh, and Robert B. Anderson

Publication:

Symposium Papers

Volume:

273

Abstract:

This example illustrates strut-and-tie detailing techniques used to produce a practical and constructible design. Information presented herein is based on a 34 story post-tensioned concrete structure in Grand Rapids, Michigan that utilized deep concrete grade beams for its foundation system. The River House condominium project used over 1,900 cubic yards (1,400 cubic meters) of concrete and 380,000 lb (172,000 kg) of reinforcement for the grade beams alone. The grade beam illustrated in this example cantilevers over an existing caisson and a 60 in. (1,500 mm) brick sanitary sewer.

DOI:

10.14359/51682291


Document: 

SP273-02

Date: 

September 20, 2010

Author(s):

Christopher S. Williams, Michael D. Brown, and Oguzhan Bayrak

Publication:

Symposium Papers

Volume:

273

Abstract:

The design of a statically indeterminate bent cap is presented. The cap resists six concentrated loads and is supported on four columns. Analysis, design, and detailing are all presented. Each of these steps is based on the ACI 318-08 Appendix A Strut-and-Tie Modeling (STM) provisions. Two load cases are considered and the controlling forces in the STMs are used to develop the final design. The objective of the example problem is to help familiarize engineers with the basic STM procedure through a fairly simple beam design.

DOI:

10.14359/51682290


Document: 

SP273-12

Date: 

September 20, 2010

Author(s):

Richard J. Beaupre, Robert B. Anderson, and Velvet Bridges

Publication:

Symposium Papers

Volume:

273

Abstract:

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.

DOI:

10.14359/51682300


Document: 

SP273-11

Date: 

September 20, 2010

Author(s):

Widianto and Oguzhan Bayrak

Publication:

Symposium Papers

Volume:

273

Abstract:

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.

DOI:

10.14359/51682299


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