lecture15 - Lecture15Bar Development July11,2003 CVEN444...

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    Lecture 15- Bar  Lecture 15- Bar  Development Development July 11, 2003 CVEN 444
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    Lecture Goals Lecture Goals Bar Cut-off Points Splice Tension Splice Compression Splice
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    Determining Locations of Flexural  Determining Locations of Flexural  Cutoffs Cutoffs Given a simply supported beam with a distributed load.
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    Determining Locations of Flexural  Determining Locations of Flexural  Cutoffs Cutoffs Note : Total bar length = Fully effective length + Development length
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    Determining Locations of Flexural  Determining Locations of Flexural  Cutoffs Cutoffs ACI 12.10.3 All longitudinal tension bars must extend a min. distance = d (effective depth of the member) or 12 d b (usually larger) past the theoretical cutoff for flexure (Handles uncertainties in loads, design approximations,etc. .)
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    Determining Locations of Flexural  Determining Locations of Flexural  Cutoffs Cutoffs Development of flexural reinforcement in a typical continuous beam. ACI 318R-02 - 12.10 for flexural reinforcement
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    Bar Cutoffs - General Procedure Bar Cutoffs - General Procedure Determine theoretical flexural cutoff points for envelope of bending moment diagram. Extract the bars to satisfy detailing rules (from ACI Section 7.13, 12.1, 12.10, 12.11 and 12.12) Design extra stirrups for points where bars are cutoff in zone of flexural tension (ACI 12.10.5) 1. 2. 3.
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    Bar Cutoffs - General Rules Bar Cutoffs - General Rules Bars must extend the longer of d or 12d b past the flexural cutoff points except at supports or the ends of cantilevers (ACI 12.11.1) All Bars Rule 1. Rule 2. Bars must extend at least l d from the point of maximum bar stress or from the flexural cutoff points of adjacent bars (ACI 12.10.2 12.10.4 and 12.12.2)
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    Bar Cutoffs - General Rules Bar Cutoffs - General Rules Structural Integrity Simple Supports At least one-third of the positive moment reinforcement must be extend 6 in. into the supports (ACI 12.11.1). Continuous interior beams with closed stirrups . At least one-fourth of the positive moment reinforcement must extend 6 in. into the support (ACI 12.11.1 and 7.13.2.3) Positive Moment Bars Rule 3.
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    Bar Cutoffs - General Rules Bar Cutoffs - General Rules Structural Integrity Continuous interior beams without closed stirrups. At least one-fourth of the positive moment reinforcement must be continuous or shall be spliced near the support with a class A tension splice and at non-continuous supports be terminated with a standard hook. (ACI 7.13.2.3). Positive Moment Bars Rule 3.
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    Bar Cutoffs - General Rules Bar Cutoffs - General Rules Structural Integrity Continuous perimeter beams. At least one- fourth of the positive moment reinforcement required at midspan shall be made continuous around the perimeter of the building and must be enclosed within closed stirrups or stirrups with 135 degree hooks around top bars. The required
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This note was uploaded on 10/03/2011 for the course CVEN 444 taught by Professor Staff during the Summer '08 term at Texas A&M.

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lecture15 - Lecture15Bar Development July11,2003 CVEN444...

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