WEB SESSIONS - concrete.org1 WEB SESSIONS ACI Spring 2014 Convention March 23 - 25, Reno, NV...
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1 WEB SESSIONS ACI Spring 2014 Convention March 23 - 25, Reno, NV Unconventional Reinforced Concrete Bridge Columns WEB SESSIONS Confinement Model for Bridge Columns Using Cross Spirals by Riyadh A. Hindi, Associate Professor, Saint Louis University, Saint Louis, MO Confinement Model for Bridge Columns Using Cross Spirals Riyadh Hindi, PhD, PEng Jonathan West, MS Objectives Modification of model parameters Prediction model for normal strength concrete Prediction model for high-strength concrete Theoretical stress-strain relationship for normal and high-strength concrete Model Development Proposed Model Model Parameters Normal Strength Data High Strength Data Model Parameters Core Area Effective Core Area Confinement Effectiveness Ratio Confinement Pressure Confined Compressive Strength
Transcript of WEB SESSIONS - concrete.org1 WEB SESSIONS ACI Spring 2014 Convention March 23 - 25, Reno, NV...
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WEB SESSIONS
ACI Spring 2014 ConventionMarch 23 - 25, Reno, NV
Unconventional Reinforced Concrete Bridge Columns
WEB SESSIONS
Confinement Model for Bridge Columns Using Cross Spirals
by
Riyadh A. Hindi, Associate Professor, Saint Louis University, Saint Louis, MO
Confinement Model for Bridge Columns Using Cross Spirals
Riyadh Hindi, PhD, PEng
Jonathan West, MS
Objectives
Modification of model parameters
Prediction model for normal strength concrete
Prediction model for high-strength concrete
Theoretical stress-strain relationship for normal and high-strength concrete
Model Development
Proposed Model
Model Parameters
Normal Strength
Data
High Strength
Data
Model Parameters
Core Area
Effective Core Area
Confinement Effectiveness
Ratio
Confinement Pressure
Confined Compressive
Strength
2
Core Area
Effective Core Area
Confinement Effectiveness
Ratio
Confinement Pressure
Confined Compressive
StrengthCore Area
Core Area
Effective Core Area
Confinement Effectiveness
Ratio
Confinement Pressure
Confined Compressive
StrengthCore Area
Core Area
Effective Core Area
Confinement Effectiveness
Ratio
Confinement Pressure
Confined Compressive
StrengthCore Area
Core Area
Effective Core Area
Confinement Effectiveness
Ratio
Confinement Pressure
Confined Compressive
StrengthConcrete Core Area
Core Area
Effective Core Area
Confinement Effectiveness
Ratio
Confinement Pressure
Confined Compressive
Strength Hoops
Core Area
Effective Core Area
Confinement Effectiveness
Ratio
Confinement Pressure
Confined Compressive
Strength Hoops
3
Core Area
Effective Core Area
Confinement Effectiveness
Ratio
Confinement Pressure
Confined Compressive
StrengthSingle Spiral
Core Area
Effective Core Area
Confinement Effectiveness
Ratio
Confinement Pressure
Confined Compressive
StrengthSingle Spiral
Core Area
Effective Core Area
Confinement Effectiveness
Ratio
Confinement Pressure
Confined Compressive
StrengthSingle Spiral
Method 1
Method 2
Core Area
Effective Core Area
Confinement Effectiveness
Ratio
Confinement Pressure
Confined Compressive
StrengthDouble Spiral
Core Area
Effective Core Area
Confinement Effectiveness
Ratio
Confinement Pressure
Confined Compressive
StrengthDouble Spiral
Method 1
Method 2
Core Area
Effective Core Area
Confinement Effectiveness
Ratio
Confinement Pressure
Confined Compressive
Strength
4
Core Area
Effective Core Area
Confinement Effectiveness
Ratio
Confinement Pressure
Confined Compressive
Strength
Two Data Sets
High Strength
Normal Strength
Core Area
Effective Core Area
Confinement Effectiveness
Ratio
Confinement Pressure
Confined Compressive
Strength
Normal Strength
4 Single Spiral
6 Double Spiral
High Strength
7 Single Spiral
14 Double Spiral
Normal Strength Data Series
Normal Concrete
Single Spiral
39.2 MPa
36.1 MPa
Double Spiral
39.2 Mpa
36.1 MPa
Normal Strength Data Series High Strength Data Series
High Strength
Single Spiral 67.3 MPa
Double Spiral 67.3 MPa
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High Strength Data Series Octahedral Stress
Normal Strength Concrete High Strength Concrete
Normal and High Strength Data Normal and High Strength Data
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Stress-Strain Relationships
Mander et al. (1988)
Bing et al. (2001)
Normal Strength 25X6-1
Normal Strength 35X6-1 Normal Strength 70X6-2
High Strength 50X8 High Strength 100X8
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High Strength 55X10 Conclusions
Mander et al. model modification
Normal strength concrete follows Mander et al. prediction model
High-strength concrete does not follow the Mander et al. or Bing et al.
Stress-Strain relationship for normal strength is best described by Mander et al.
Stress-Strain relationship for high-strength is best described by Bing et al.
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