STEPS FOR SAFE DESIGN AND CONSTRUCTION OF MULTISTOREY REINFORCED CONCRETE BUILDINGS - PART 2 2.5 Heavy Water Tanks on the Roof: Heavy water tanks add large lateral inertia forces on the building frames due to the so called ‘whipping’ effect under seismic vibrations, but remain unaccounted for in the design. See the fall of such water tank in Fig.10 Fig.10 - 5 storey R.C., collapse of open plinth, water tank at top dislocated (Bhuj) Recommendation :- All projected systems above the roof top behave like secondary elements subjected to roof level horizontal earthquake motions which act as base motions to such projecting systems. To account for such heavy earthquake forces, IS:1893-2002 (Part 1) provides in clause 7.12 that their support system should be designed for five times the design horizontal seismic co-efficient A h specified in clause 6.4.2. Similarly any horizontal projections as the balconies or the cantilevers supporting floating col...
Engineering & interesting stuff !!!