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Book ChapterDOI

Issues on Design Shear Strength of RC Deep Beams

01 Jan 2019-pp 107-117
Abstract: In this paper, a simple analytical expression is proposed for limiting the design shear strength of RC deep beams, by considering following facts. The maximum shear strength equation of ACI code is same for both concentrated and uniformly distributed loading cases. The effect of \( \frac{a}{d} \) needs to be accounted for properly. Second, the effect of size, tension reinforcement and limitations on compressive strength of concrete result in either overestimation or high underestimation of shear strength of beams with a/d ratio ranging between 1.0 and 2.0. The proposed equation is validated with the test data of 413 deep beams segregated from literature and design provisions of various codes. The proposed model overestimates only, a meagre fraction, 5% of the collected data, whereas the ACI 318-14 code equation overestimates 18.4% of collected data.

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Topics: Shear strength (60%), Compressive strength (56%)
References
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01 Jan 2011-
Abstract: The “Building Code Requirements for Structural Concrete” (“Code”) covers the materials, design, and construction of structural concrete used in buildings and where applicable in nonbuilding structures. The Code also covers the strength evaluation of existing concrete structures. Among the subjects covered are: contract documents; inspection; materials; durability requirements; concrete quality, mixing, and placing; formwork; embedded pipes; construction joints; reinforcement details; analysis and design; strength and serviceability; flexural and axial loads; shear and torsion; development and splices of reinforcement; slab systems; walls; footings; precast concrete; composite flexural members; prestressed concrete; shells and folded plate members; strength evaluation of existing structures; provisions for seismic design; structural plain concrete; strut-and-tie modeling in Appendix A; alternative design provisions in Appendix B; alternative load and strength reduction factors in Appendix C; and anchoring to concrete in Appendix D. The quality and testing of materials used in construction are covered by reference to the appropriate ASTM standard specifications. Welding of reinforcement is covered by reference to the appropriate American Welding Society (AWS) standard. Uses of the Code include adoption by reference in general building codes, and earlier editions have been widely used in this manner. The Code is written in a format that allows such reference without change to its language. Therefore, background details or suggestions for carrying out the requirements or intent of the Code portion cannot be included. The Commentary is provided for this purpose. Some of the considerations of the committee in developing the Code portion are discussed within the Commentary, with emphasis given to the explanation of new or revised provisions. Much of the research data referenced in preparing the Code is cited for the user desiring to study individual questions in greater detail. Other documents that provide suggestions for carrying out the requirements of the Code are also cited.

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1,964 citations



Journal ArticleDOI
Randall W. Poston, Charles W. Dolan1Institutions (1)
TL;DR: ACI Committee 318 has taken a fresh perspective and reorganized the Code to provide a more user-friendly back bone for design and it is believed that changes made to future versions of the Code will be more transparent and obvious such that designers do not miss new requirements.

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Abstract: The structure of the current ACI Building Code has remained essentially unchanged since 1963 when ultimate strength was added. Knowledge has expanded with time through practice and research. In str...

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376 citations


Journal ArticleDOI
01 Mar 1967-
Abstract: FOUR SERIES OF TEST BEAMS WITH DEPTHS OF 6, 12, 24, AND 48 INCHS WERE TESTED AT THE UNIVERSITY OF TORONTO AND THE RESULTS COMPARED CONSIDERABLE INFLUENCE OF THE ABSOLUTE DEPTH BECAME APPARENT TO SUCH AN EXTENT THAT THE SAFETY FACTOR FOR THE LARGEST BEAMS WAS APPROXIMATELY 40 PERCENT LOWER THAN THE OTHERWISE SIMILAR SMALLER BEAMS THIS TREND INDICATES THAT, WITH A FURTHER INCREASE IN DEPTH, A CORRESPONDINGLY FURTHER DECREASE IN THE SAFETY FACTOR CAN BE EXPECTED /AUTHOR/

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288 citations


Journal ArticleDOI

138 citations