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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:
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
SP208-04Ex.6
Adolfo Matamoros and Julio A. Ramirez
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.
10.14359/12419
SP208-04Ex.4
Lawrence C. Novak and Heiko Sprenger
The example problem of a deep beam with a rectangular opening represents a strong example of the application of Strut-and-Tie modeling of reinforced concrete structures. Since the entire beam constitutes a D-region, this example demonstrates the principles and methods that can be utilized to solve a wide range fo problems. Example #4 has been fully evaluated per the requirements of Appendix A of ACI 318-02.
10.14359/12417
SP208-01
Karl - Heinz Reineck
10.14359/12409
SP208-02
James G. MacGregor
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.
10.14359/12410
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