American Society of Civil Engineers


Precast Concrete Roof Structure: Failure and Repair


by German Gurfinkel, F.ASCE, (Prof., Dept. of Civ. Engrg., Univ. of Illinois at Urbana-Champaign, IL 61801)

Journal of Performance of Constructed Facilities, Vol. 2, No. 3, August 1988, pp. 144-158, (doi:  http://dx.doi.org/10.1061/(ASCE)0887-3828(1988)2:3(144))

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Document type: Journal Paper
Abstract: Heavy concrete fragments crashing into the floor of a huge warehouse building, from an overhead precast structure, calls for an investigation to determine the cause of this phenomenon and stop it. Field observations show that the roof double-tees are bearing on the edge of improperly reinforced concrete flanges of precast I-girders. This causes cracking and eventual fallout of fragments of the girder flange. As a result, bearing of some of the double-tees is reduced to 1.5 in., an unacceptable amount. Such precarious support could cause sudden and catastrophic failure. The shortcomings of the original design are identified, and a correct design that would have prevented failure is presented herein. The latter would have included use of elastomeric bearing plates and additional reinforcement in the girder flange; actual details are shown. Repair is accomplished locally at the affected double-tees, using a simple solution made out of structural steel; a full description including details is given.


ASCE Subject Headings:
Connections
Cracking
Precast concrete
Rehabilitation
Reinforced concrete
Roofs
Spalling