Unusual Application of Prestressed Waffle Slabs and Composite Beams


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Title: Unusual Application of Prestressed Waffle Slabs and Composite Beams

Author(s): C. Andrew Pretzer

Publication: Journal Proceedings

Volume: 69

Issue: 12

Appears on pages(s): 765-769

Keywords: beams (supports);camber;composite construction (concrete and steel); concrete construction;concrete slabs;deflection;plate girders;post-tensioning-prestressed concrete;reinforced concrete;shear connectors;shear strength; shoring;structural design.

Date: 12/1/1972

A description is given of the design and construction of the two-way post-tensioned waffle slabs and the supporting steel plate girders used in the Boston Public Library Addition. The special steps required for deflection, camber control, tendon placement, installation of headed studs and concrete shear pockets to insure composite action are presented. Unbonded tendons were used for these 60 ft (18.3 m) slab spans.