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IMPACT RESPONSE OF OVERHEAD SIGN BRIDGES MOUNTED
WIND LOADS ON LOUVERED SIGNS
3-lb single 45 Head AASHO Specifications accelerometers AISC angle of attack base bending breakaway supports cantilever beam collision column crash tests crash vehicle critical buckling stress critical stress formula curved louver curved-louver damage dead-load deflections Engineering equation factor of safety Federal Highway Administration field tests flange flat-plate ft-kip full-scale head-on Highway Research highway sign hits truss Ek impact forces impacting vehicle installations Krefeld Lateral buckling lift force light poles limit load distributors louver angle louver models louver width louvered sign maximum monotubular normal-force coefficient obtained overhead sign bridge overhead sign structures pipe plate Post hits truss post penetration prototype structure reduce sections shown in Figure sign bridge support sign marker sign supports Simca speed steel straight louver straight-louver models Support Structures test results Texas A&M University Texas Transportation Institute tion torsional Vehicle after Test weight wind loads yielding sign