No abstract

The present paper deals with the reevaluation of design stresses and assessment of safety margins available for an underground reinforced cement concrete (RCC) duct. For stress analysis, a two-dimensional mathematical model has been adopted to appropriately represent the structure. The structure has been analyzed for both static and seismic loads. The seismic analysis has been carried out for site-specific response spectra. The design checks have been performed using available international standards and, accordingly, the safety margins have been evaluated. The structure has been found to possess sufficient safety margins under all the postulated design loadings. The seismic reassessment methodology conforms to the available international standards.

The present paper deals with the re-evaluation of design stresses and assessment of safety margins available for an underground RCC duct. For stress analysis, a 2-D mathematical model has been adopted to represent the structure appropriately. The structure has been analyzed for both static and seismic loads. The seismic analysis has been carried out for site-specific response spectra. The design checks have been performed using available international standards and accordingly the safety margins have been evaluated. The structure has been found to possess sufficient safety margin under all the postulated design loadings. The seismic reassessment methodology conforms to the available international standards.