Some specimens were prestressed with
five %i6-in. diameter strands and others
with fifteen 1/4-in. diameter strands. All
strands in a specimen had the same cover, 1, 2, or 3 in. Some specimens were
made of normal weight concrete and
others of lightweight concrete. Load intensities (MD + L) during the tests
ranged between 40 and 60 percent of
the calculated ultimate capacities. During the fire tests, the steel temperatures
were monitored. The temperature of
the steel when collapse was imminent
was used in calculating the residual
moment capacity.