Can a two-story commercial building be designed and built to be tornado-proof without unusual precautions or expense ?
Tornado-proofness could be assured only by a structural designer, but some of the findings in a Portland Cement Association report by Donald M. Schultz, Mark Fintel and John Cherry may be helpful. It was found that cast-in-place reinforced concrete construction is highly effective in resisting tornadoes because it provides continuity, mass and ductility. Reinforced concrete is therefore a good choice of material with which to design for tornado resistance. Precast concrete buildings also can be highly tornado-proof provided they embody connection details that will resist high overload stresses. By using concrete it is possible to obtain higher than normal tornado resistance without any increase in cost.