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International Concrete Abstracts Portal

Showing 1-5 of 16 Abstracts search results

Document: 

SP208-03

Date: 

October 29, 2002

Author(s):

Denis mitchell, William D. Cook, Claudia M. Uribe and Sergio M. Alcocer

Publication:

Symposium Papers

Volume:

208

Abstract:

Results of experiments on a corbel, deep beams and a beam with dapped ends are presented to illustrate how strut-and-tie models are applied to these cases and to provide some experimental verification of the accuracy of the predictions. Both simple strut-and-tie models, as well as refined strut-and-tie models are presented.

DOI:

10.14359/12411


Document: 

SP208-02

Date: 

October 29, 2002

Author(s):

James G. MacGregor

Publication:

Symposium Papers

Volume:

208

Abstract:

This paper documents the decisions made by ACI Committee 3 18 to introduce strut-and-tie models into the 2002 ACI Code. Sections 3 and 4 of this paper review code statements concerning the layout of strut-and-tie models for design. The format and values of the effective compression strength of struts are presented in Sec. 5. The first step was to derive an effective compression strength which gave the same cross-sectional area and strength using Appendix A as required by another code for the same concrete strength and same unfactored loads. The final selection of design values of the effective compression strength considered test results, design values from the literature, values from other codes, and ACI Code design strengths for similar stress situations. A similar derivation of the effective compression strengths of nodal zones is summarized in Sec. 6 of the paper. The description of the geometry of nodal zones in code language proved difficult. The design of ties is described in Sec. 7 of this paper and requirements for nominal reinforcement are in Sec. 8. Nominal reinforcement is provided to add ductility, to improve the possibility of redistribution of internal forces, and to control cracks at service loads.

DOI:

10.14359/12410


Document: 

SP208-04Ex.1a

Date: 

October 29, 2002

Author(s):

Claudia M. Uribe and Sergio M. Alcocer

Publication:

Symposium Papers

Volume:

208

Abstract:

A deep beam, supporting two concentrated loads at the top, was designed in accordance with Appendix A of the ACI 318-2002, The analysis and design using the strut and tie model were performed in an efficient and straight forward manner. The strut and tie methodology provides a framework to understand and assess the flow of forces and the resisting mechanisms. Also, it is a valuable tool for achieving proper detailing of ductile concrete members.

DOI:

10.14359/12412


Document: 

SP208-04Ex.2

Date: 

October 29, 2002

Author(s):

David H. Sanders

Publication:

Symposium Papers

Volume:

208

Abstract:

At the ends of dapped-end beams, the transfer of load from the support into the beam is a D-region. The STM is excellent for modeling such a region. In a number of applications, for example parking structures, dapped-end beams are used in conjunction with inverted T-Beams. At each point where the load of the dapped-end beam sets on the inverted T-beam, a D-region is formed. The following example used ACI 318-02 Appendix A to design both the end region of thedapped-end beam as well as the tie back and vertical reinforcement needed for each point load on the inverted T-beam. Conventional B-regions in the dapped-end beam are designed using conventional AC1 beam design.

DOI:

10.14359/12414


Document: 

SP208-01

Date: 

October 29, 2002

Author(s):

Karl - Heinz Reineck

Publication:

Symposium Papers

Volume:

208

DOI:

10.14359/12409


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