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Prestressed foundation resists roof thrusts
Foundation problem of Holy Trinity Church near Pittsburgh, Pa, arises from fact that roof structure is unsymmetrical about all centerlines but one; thrusts are resisted partly by steel ties located below grade between piers and partly by internal shear resistance of piers; ties (cables) were prestressed to keep piers from being overstressed and were placed at varying elevations at four piers in order to balance overturning forces caused by shell thrusts; stress values, converted from strain measurements, were higher than would be expected due to temperature differential itself (3860 psi at gage No. 1); to prevent overstressing of structure during decentering of formwork, it was necessary to shorten shores in progressive increments.
Prestressed foundation resists roof thrusts
Foundation problem of Holy Trinity Church near Pittsburgh, Pa, arises from fact that roof structure is unsymmetrical about all centerlines but one; thrusts are resisted partly by steel ties located below grade between piers and partly by internal shear resistance of piers; ties (cables) were prestressed to keep piers from being overstressed and were placed at varying elevations at four piers in order to balance overturning forces caused by shell thrusts; stress values, converted from strain measurements, were higher than would be expected due to temperature differential itself (3860 psi at gage No. 1); to prevent overstressing of structure during decentering of formwork, it was necessary to shorten shores in progressive increments.
Prestressed foundation resists roof thrusts
Arch Rec
Gensert, R.M. (author)
Architectural Record ; 142
1967
4 pages
Article (Journal)
English
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