ML24358A128
| ML24358A128 | |
| Person / Time | |
|---|---|
| Issue date: | 10/30/2024 |
| From: | Aliyeva G, Cesare M, Gupta A NRC/RES/DE/SGSEB |
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| https://usnrc-my.sharepoint.com/personal | |
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| Download: ML24358A128 (22) | |
Text
Modeling the Non-linear Behavior of ASR-affected Concrete Structures 1
Gunay Gina Aliyeva, Mark Cesare, Abhinav Gupta DOE/NRC Natural Phenomena Hazards Meeting October 30, 2024
2 What is Alkali-Silica Reaction (ASR) in concrete?
Outline:
New approach: FE-based non-linear concrete damage plasticity model to simulate ASR Conclusions & Future work Results: Comparison with experimental data Aging and degradation in nuclear structures ASR?
Literature New approach Results Conclusions
3 What is Alkali-Silica Reaction (ASR) in concrete?
Outline:
New approach: FE-based non-linear concrete damage plasticity model to simulate ASR Conclusions & Future work Results: Comparison with experimental data Aging and degradation in nuclear structures What is Alkali-Silica Reaction (ASR) in concrete?
ASR?
Literature New approach Results Conclusions ASR?
4 What is Alkali-Silica Reaction (ASR) in concrete?
ASR?
Literature New approach Results Conclusions ASR?
Thomas, Michael DA, et al. Alkali-silica reactivity field identification handbook. No. FHWA-HIF-12-022. United States. Federal Highway Administration. Office of Pavement Technology, 2011.
Reactive silica in aggregate Alkali in concrete Slow-evolving chemical reaction Gel expands in volume Cracking + degradation in mechanical properties of the concrete Taken from Technical Report FHWA-HIF-09-004, Federal Highway Administration (2010)
5 What is Alkali-Silica Reaction (ASR) in concrete?
Outline:
New approach: FE-based non-linear concrete damage plasticity model to simulate ASR Conclusions & Future work Results: Comparison with experimental data Aging and degradation in nuclear structures Aging and degradation in nuclear structures ASR?
Literature New approach Results Conclusions Literature
6 ASR?
Literature New approach Results Conclusions Literature Past and ongoing research: Aging and degradation in nuclear structures Seabrook Nuclear Power Plant is the first plant in the U.S. where ASR-induced degradation was observed.
ASR-induced degradation in nuclear power plants has been observed in the reinforced concrete foundation of Ikata nuclear power plant in Japan.
In Belgium, concrete degradation due to ASR was observed in containment building of Tihange 2 reactor.
In Canada, ASR was identified in one of the plants of CANDU 6 reactor and investigation was performed in order to establish the means of accounting for ASR.
Concrete containment structure of Gentilly-2 nuclear power plant in Canada was also affected by ASR-induced degradation and was investigated as part of the preparation for the license renewal process.
Taken from https://en.wikipedia.org/wiki/Seabrook_Station_Nuclear_Power_Plant#/media/File:Seabrook_2009-2.jpg Simulation of ASR-affected concrete structure behavior is necessary to evaluate the structural resiliency.
7 What is Alkali-Silica Reaction (ASR) in concrete?
Outline:
New approach: FE-based non-linear concrete damage plasticity model to simulate ASR Conclusions & Future work Results: Comparison with experimental data Aging and degradation in nuclear structures New approach: FE-based non-linear concrete damage plasticity model to simulate ASR ASR?
Literature New approach Results Conclusions New approach
8 New approach: FE-based non-linear concrete damage plasticity model to simulate ASR ASR?
Literature New approach Results Conclusions New approach Description of Experimental Data ASR-Affected Panel Specimens (Anca-Cristina Ferche, 2020) 10 RC panel specimens (2 panels x 5 cast) were cast with either reactive or non-reactive concrete Conditioned at 50°C and 97% relative humidity for 200 days.
Conditioned panels were then tested to failure to investigate the response of ASR-affected reinforced concrete panel specimens subjected to shear stresses Varying amounts of reinforcement in x, y and z directions.
Cast with non-reactive, reactive fine (Jobe-Newman),
or reactive coarse (Spratt) aggregate
9 New approach: FE-based non-linear concrete damage plasticity model to simulate ASR ASR?
Literature New approach Results Conclusions New approach ASR-Affected Panel Specimens (Anca-Cristina Ferche, 2020) 890x890x70 mm panels 75x75x285 mm plain concrete prisms in X dir in Y dir in Z dir x (%)
y (%)
z (%)
CAST 1 Non-reactive PANELS AF1 40-D8 10-D4 3.31 0.42 AF2 40-D8 20-D4 3.31 0.84 PRISMS 3 prisms - ASTM C1293 CAST 2 Reactive fine agg.
(Jobe-Newman)
PANELS AF3 40-D8 10-D4 3.31 0.42 AF4 40-D8 20-D4 3.31 0.84 PRISMS 3 prisms - ASTM C1293 CAST 3 Reactive coarse agg.
(Spratt)
PANELS AF5 40-D8 10-D4 3.31 0.42 AF6 40-D8 20-D4 3.31 0.84 PRISMS 3 prisms - ASTM C1293 Description of Experimental Data
10 New approach: FE-based non-linear concrete damage plasticity model to simulate ASR ASR?
Literature New approach Results Conclusions New approach Concrete Damaged Plasticity Model Plasticity-based damage model for concrete Two failure mechanisms: tensile cracking and compressive crushing of concrete.
Dilation angle (): Controls an amount of plastic volumetric strain developed during plastic shearing.
Dilation angle () as a function of volumetric plastic strain rate and axial plastic strain rate. (Vermeer and De Borst, 1984)
Development of Finite Element Based Approach
11 New approach: FE-based non-linear concrete damage plasticity model to simulate ASR ASR?
Literature New approach Results Conclusions New approach Development of Finite Element Based Approach Non-Reactive Panels Proposed "a" and "b " values 0.2 and 7 Syed and Gupta "a" and "b " values 0.4 and 2 (Syed and Gupta, 2015)
12 New approach: FE-based non-linear concrete damage plasticity model to simulate ASR ASR?
Literature New approach Results Conclusions New approach Reactive Panels: Determining ASR Strains Step 1: ASR modeling parameters are determined using ASTM prism strains Step 2: Weights are determined for different reinforcement ratios Step 3: ASR-induced strains in each direction are calculated for all reactive panels at each loading step using calculated ASR parameters and weights
13 New approach: FE-based non-linear concrete damage plasticity model to simulate ASR ASR?
Literature New approach Results Conclusions New approach Reactive Panels Step 1: Expansion Analysis ASR expansion is modeled using orthotropic thermal expansion.
Concrete was expanded to replicate prestrain due to ASR.
The bars were pulled with the expanded concrete.
Step 2: Shear Model A similar analysis to AF1 model is conducted:
- Initial elasticity modulus degraded using the ASR expansion strain.
- Concrete material properties are changed.
- Expanded model is used as the initial boundary conditions of the shear analysis.
= 0.003
1
=
0.003 +
= 1 Modulus degradation captured by d d depends on ASR-induced strain (Capra and Sellier, 2003)
14 New approach: FE-based non-linear concrete damage plasticity model to simulate ASR ASR?
Literature New approach Results Conclusions New approach Observations from Preliminary Analysis Observation 1: Effect of Tensile Strength of Concrete Behavior at first crack is predicted better with the experimental tensile strength.
At high strains other improvements are needed.
15 New approach: FE-based non-linear concrete damage plasticity model to simulate ASR ASR?
Literature New approach Results Conclusions New approach Observations from Preliminary Analysis Observation 2: Selection of Tension Stiffening in Concrete Behavior is predicted well with the updated tension stiffening equation based on experimental data.
16 New approach: FE-based non-linear concrete damage plasticity model to simulate ASR ASR?
Literature New approach Results Conclusions New approach Observations from Preliminary Analysis Observation 3: Consideration of Tension and Compression Damage The final validated model only uses the tension damage, dt, as ASR expansion creates tensile stresses.
17 New approach: FE-based non-linear concrete damage plasticity model to simulate ASR ASR?
Literature New approach Results Conclusions New approach Observations from Preliminary Analysis Observation 4: Selection of Appropriate Dilation Angle Proposed update:
Select input Conduct analysis with input and output strains.
Use strains in the dilation angle equation and find calculated If calculated = input then use this dilation angle for the given loading step If not, then repeat the procedure by updating input in Step 1 until input = calculated Repeat the procedure for the next loading steps
18 What is Alkali-Silica Reaction (ASR) in concrete?
Outline:
New approach: FE-based non-linear concrete damage plasticity model to simulate ASR Conclusions & Future work Results: Comparison with experimental data Aging and degradation in nuclear structures Results: Comparison with experimental data ASR?
Literature New approach Results Conclusions Results
19 Results: Comparison with experimental data ASR?
Literature New approach Results Conclusions Results
20 What is Alkali-Silica Reaction (ASR) in concrete?
Outline:
New approach: FE-based non-linear concrete damage plasticity model to simulate ASR Conclusions & Future work Results: Comparison with experimental data Aging and degradation in nuclear structures Conclusions & Future work ASR?
Literature New approach Results Conclusions Conclusions
21 Conclusions & Future work ASR?
Literature New approach Results Conclusions Conclusions Tensile strength Initial cracking and post-cracking behavior.
Model with the experimental tensile strength accurately captures the post-cracking stress-strain behavior.
Tension stiffening based on experimental data works well.
Using only tension damage (dt) in the CDP model is sufficient.
If the applied loading can lead to compression damage Both dc and dt Dilation angle does not remain constant. In finite element analysis, it needs to be estimated at each loading step.
22 Thank you!
Any questions?