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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: 

SP208

Date: 

October 29, 2002

Author(s):

Editor: Karl-Heinz Reineck

Publication:

Symposium Papers

Volume:

208

Abstract:

SP-208 With the addition of the new Appendix A on strut-and-tie models in ACI 318-02, "Building Code Requirements for Structural Concrete," engineers have an alternative code procedure for designing structural concrete members where the usual sectional design assumptions for flexure and shear do not apply. ACI SP-208 contains selected papers presented at the 2002 ACI Fall Convention by members of ACI Subcommittee 445-A, Shear and Torsion: Strut-and-Tie Models. This publication shows engineers how to apply strut- and-tie modeling in accordance with Appendix A. The papers also trace the development of Appendix A of ACI 318-02 and summarize important tests that confirm strut-and-tie modeling as a rational basis for the design of structural concrete. Most of the examples have been taken from practice. In addition to explaining the approach of determining a model, they point out where problems can occur in dimensioning or in detailing and anchoring of the reinforcement and how the design can be improved.

DOI:

10.14359/14017

Document: 

SP208-04Ex.6

Date: 

October 29, 2002

Author(s):

Adolfo Matamoros and Julio A. Ramirez

Publication:

Symposium Papers

Volume:

208

Abstract:

The design of the end region of a prestressed beam according to Appendix A of the 2002 ACI Building Code is presented. Two alternatives are considered, the first with straight strands and debonding toward the ends of the member in order to control stresses at transfer. The second case is with draped strands. Strut-and-tie modles corresponding to each of the two alernatives are developed, analyzed, and the reinforcement is proportioned to reseist the calculated internal forces. Anchorage length requirements were a critical factor in selecting the configuration of the truss model.

DOI:

10.14359/12419

Document: 

SP208-04Ex.7

Date: 

October 29, 2002

Author(s):

Bob Anderson

Publication:

Symposium Papers

Volume:

208

Abstract:

Strut-and-tie models make the design of portions of complex structures transparent. This example, a pier table from a cable stayed bridge, is developed to show how strut-and-tie modeling can be used for an area that may be exposed to cyclic loading and how the results from alternate loads may be superimposed upon one another. The pier table transmits forces from the pylon, through an integral superstructure connection, to individual support legs. The pier table also creates an area for the transmission of superstructure forces. This example briefly describes the model development based upon the perceived flow of forces within the structure. The tie reinforcement is then detailed and the nodal zones checked.

DOI:

10.14359/12420

Document: 

SP208-04Ex.8

Date: 

October 29, 2002

Author(s):

Robert W. Barnes

Publication:

Symposium Papers

Volume:

208

Abstract:

In this example, application of the new strut-and-tie modeling provisions of ACI 318-02 to the design of a wall with openings is summarized. Because the openings constitute a significant portion of the wall, earlier Code versions provide little relevant guidance fro ensuring that the wall provides adequate resistance to the applied loads. Previous examples fo the application of strut-and-tie models (STM's) to multiple load cases and/or lateral loads are rare. The wall in this example is designed to resist multiple combinations of both gravity and in-plane lateral loads. Construction of the STM for each load eombination is outlined. In addition, employment of statically indeterminate STM's to improve the efficiency and serviceability of the wall design is discussed. The example also covers selection and anchorage of tie reinforcement, as well as capacity checks for struts and nodal zones.

DOI:

10.14359/12421

Document: 

SP208-04-Ex.9

Date: 

October 29, 2002

Author(s):

Gary J. Klein

Publication:

Symposium Papers

Volume:

208

Abstract:

The following example illustrates use of STM's for design of a pile cap. Two load cases are considered: 1) axial load only, and 2) axial load and overturning moment. The design is based on Appendix A of ACI 318-02 Results are compared to section design procedures per ACI 318-99. Compared to section design metods, STM design is more rational and leads to a more reliable structure. Because the reinforcing bars are located above the piles, overall footing depth is increased compared to traditional design in which the bars are placed between piles.

DOI:

10.14359/12422

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