STRC01 ReinforcedConcrete Part1 0715
January 30, 2017 | Author: Kevin | Category: N/A
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design (Part 1) Structural Engineering Review Course
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
1
Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Lesson Overview Reinforced Concrete Design (Part 1) • General Requirements
• Shear in Beams
• Strength Design Principles
• Deep Beams
• Strength Design of Reinforced Concrete • Corbels Beams • Beams in Torsion • Serviceability Requirements for Beams
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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2
Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Learning Objectives You will learn • reinforced concrete design theory • R/C beam design • R/C corbel design • efficient solution approaches • common terminology and practice • code nomenclature • short‐cuts and rules‐of‐thumb
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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3
Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Prerequisite Knowledge You should already be familiar with • statics • mechanics of materials • structural analysis • basic reinforced concrete terminology
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Referenced Codes and Standards • International Building Code (IBC, 2012) • Building Code Requirements for Structural Concrete (ACI 318, 2011)
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
General Requirements IBC adopts ACI by reference. Sec. 1905 of IBC modifies some sections of ACI.
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
General Requirements 2011 ACI follows strength design method • apply factored loads • determine required ultimate strength • calculate nominal strength • multiply by factor to get design strength • design strength ≥ required ultimate strength
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Strength Design Principles required strength • service load × load factor • check all load combinations • most critical combination governs
U Q = service load U = required strength γ = load factor Q = service load STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Strength Design Principles loads
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Strength Design Principles load combinations (ACI Sec. 9.2.1) STRM Sec. 1.2
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Example: Strength Design Principles CSCO Example 2.1 dead load
live load or roof live load
wind load
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Example: Strength Design Principles
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
12
12
Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Example: Strength Design Principles
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Strength Design Principles design strength nominal strength (theoretical ultimate) × strength reduction factor design strength Rn
ϕ
= reduction factor
Rn = nominal, or theoretical, strength
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Strength Design Principles reduction factors Multiply nominal strength by these values to get design strength.
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Strength Design of Reinforced Concrete Beams reinforcement bar sizes CSCO Table 1.1 Properties of Standard Reinforcing Bars (no. 14 and no. 18 omitted)
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Strength Design of Reinforced Concrete Beams typical assumptions • rectangular stress block • tension reinforcement has yielded • linear strain • max concrete strain of 0.003 • neglect concrete in tension
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Strength Design of Reinforced Concrete Beams Fig. 1.1 Rectangular Stress Block
Tu = Cu (assumes no axial force) Mu = Tu (d – a/2) = Cu (d – a/2) Cu = 0.85fc’(β1c)(b)
American Concrete Institute. Commentary on Building Code Requirements for Reinforced Concrete. Farmington Hills, MI: American Concrete Institute, 1985.
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Strength Design of Reinforced Concrete Beams nominal flexural strength • two basic concrete strength equations to calculate nominal flexural strength • very important concrete equations
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Strength Design of Reinforced Concrete Beams depth of equivalent rectangular stress block depth of portion of concrete that is effective in compression
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Strength Design of Reinforced Concrete Beams required reinforcement ratio amount of steel required when • concrete dimensions given • moment given
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Strength Design of Reinforced Concrete Beams tension‐controlled section • strain in compression fiber (concrete) = 0.003 • strain in tension steel ≥ 0.005 •
c/d ≤ 0.375
•
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Strength Design of Reinforced Concrete Beams compression‐controlled section • strain in compression fiber (concrete) = 0.003 • strain in tension steel ≤ 0.002 •
c/d ≥ 0.600
•
STRC ©2015 Professional Publications, Inc.
© 2015 Professional Publications, Inc.
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Structural Engineering Review Course
Reinforced Concrete Design (Part 1)
Reinforced Concrete Design Part 1
Strength Design of Reinforced Concrete Beams transition region between tension‐ and compression‐controlled sections • strain in compression fiber (concrete) = 0.003 • 0.002
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