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<p>The paper is based on a case study and findings highlighting the problem that generally occurs in cylindrical reinforced concrete (RC) silos with time and continuous use in industries. The findings are of two 2,200-ton capacity silos constructed side by side over an elevated RC platform and used for storing and disposing of fly ash generated from the thermal power plant. Damages in both the silo structures were detected as vertical and horizontal cracks in the RC shell walls and also at the junction of the silo roof slab and shell wall, which evolved after a decade of use. During operation, with an increase in storing height and subsequent load in the silos, the opening of the cracks in concrete increases and results in leakage of fly ash. To determine the cause of crack growth and compelling corrective action for rehabilitation of the silos, a thorough study was conducted using nondestructive test (NDT) and finite element analysis (FEA). NDT reveals the present physical and mechanical characteristics of the RC, which were used as material properties in FEA to determine the pattern of stress development in the silo walls with a designed load to locate the maximum stressed zone. The findings facilitate understanding the correlation between the storing load in silos and the nature of stress growth in the RC structures, which leads to the development of cracks. The study also helps to plan and design the retrofitting methodology of damaged silos for their further utilization with adequate safety.</p>

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Investigating Root Cause of Distress in Concrete Silos Through NDT and FEA: Design of Retrofitting Scheme Thereof

  • 期刊论文

  • 发表日期：

    2025年8月2日

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  • Swarup Ranjan Debbarma,
  • Debashis Das,
  • Abhishek Kumar,
  • Dayamay Bouri,
  • Sumanta Chatterjee,
  • Sumanta Banerjee

摘要

The paper is based on a case study and findings highlighting the problem that generally occurs in cylindrical reinforced concrete (RC) silos with time and continuous use in industries. The findings are of two 2,200-ton capacity silos constructed side by side over an elevated RC platform and used for storing and disposing of fly ash generated from the thermal power plant. Damages in both the silo structures were detected as vertical and horizontal cracks in the RC shell walls and also at the junction of the silo roof slab and shell wall, which evolved after a decade of use. During operation, with an increase in storing height and subsequent load in the silos, the opening of the cracks in concrete increases and results in leakage of fly ash. To determine the cause of crack growth and compelling corrective action for rehabilitation of the silos, a thorough study was conducted using nondestructive test (NDT) and finite element analysis (FEA). NDT reveals the present physical and mechanical characteristics of the RC, which were used as material properties in FEA to determine the pattern of stress development in the silo walls with a designed load to locate the maximum stressed zone. The findings facilitate understanding the correlation between the storing load in silos and the nature of stress growth in the RC structures, which leads to the development of cracks. The study also helps to plan and design the retrofitting methodology of damaged silos for their further utilization with adequate safety.