Efficient Load-Bearing Capacity Assessment of a Degraded Concrete Manhole Using Sectional Homogenization.

Area of Science:

• Civil Engineering
• Structural Health Monitoring
• Materials Science

Background:

• Concrete manholes suffer severe, irregular deterioration, compromising structural integrity.
• Existing repair methods, like polyurea and polyurethane foam, restore shape but not full load-bearing capacity.
• Detailed 3D finite element analysis is computationally prohibitive for engineering assessments.

Purpose of the Study:

• To develop a practical and efficient approach for evaluating the load-bearing capacity of degraded concrete manholes.
• To assess the effectiveness of current repair strategies in restoring structural performance.
• To enable rapid, engineering-level assessments of infrastructure condition.

Main Methods:

• Surface scanning to create detailed and simplified models of damaged manholes.
• Application of internal/external polyurea and variable-thickness polyurethane foam for repair.
• Sectional homogenization technique to calculate effective parameters for simplified modeling.

Main Results:

• The proposed sectional homogenization method allows for rapid engineering-level assessment using minimal shell elements.
• Repair methods restore up to 76% of bending stiffness in heavily corroded sections.
• The repair strategy does not fully recover the original load-bearing capacity of the manholes.

Conclusions:

• A novel, computationally efficient method for assessing degraded manhole capacity has been established.
• Current repair techniques offer partial restoration of structural performance, highlighting a need for further optimization.
• The study provides a valuable tool for infrastructure maintenance and management decisions.