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Finite Element Simulation and Multi-Factor Stress Prediction Model for Cement Concrete Pavement Considering Void
Bangyi Liu1, Yang Zhou2, Linhao Gu1
1School of Transportation, Southeast University, Nanjing 211189, China.
Materials (Basel, Switzerland)
|November 26, 2020
Summary
Voids beneath concrete slabs cause significant tensile stresses, leading to damage. Increasing slab thickness effectively reduces these stresses, and a new function can predict stress based on void size, thickness, and load.
Area of Science:
- Civil Engineering
- Materials Science
- Structural Engineering
Background:
- Voids beneath concrete slabs cause uneven support, leading to high tensile stresses.
- These stresses can result in concrete pavement damage like cracking and faulting.
Purpose of the Study:
- To investigate the impact of voids on concrete slab stresses using three-dimensional finite element models.
- To develop a predictive function for maximum tensile stress considering void size, slab thickness, and vehicle load.
Main Methods:
- Development and verification of three-dimensional finite element models.
- Mesh convergence analysis for optimal element type and size.
- Validation against Chinese design standards and field measurements.
Main Results:
- Stresses are more pronounced at slab corners than edges.
- Maximum tensile stress increases significantly with void size (≥0.4 m), reaching 183.7% for a 1.0 m void.
- Increased slab thickness effectively mitigates maximum tensile stress.
Conclusions:
- Void size and depth significantly influence concrete slab stress distribution.
- Slab thickness is a critical factor in reducing tensile stress.
- A reliable function has been established for calculating maximum tensile stress in concrete slabs with voids.
Keywords:
concrete pavementfinite element modelmaximum tensile stresspredictive functionvoid underneath the slabMore Related Videos
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