One RCC 8 Storeyed building(frame_structure) served morethan 20years now found some cracks in the cloumns and twisting of the columns are also noticed. if we tab the column we can hear the hollow sound. we afraid of that is due to the overload causes buckling. but i wonder why it occured after more than 20 years. could u tell me how the columns can be repaired and the reasons for these failures.
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