1. Determine the initial stress at the bottom fibers due to prestressing force alone. 2. Determine the stress at the bottom fiber due to service load and prestressing force. 3. Calculate the additional load the floor can carry so that the stress at the bottom fibers at ti midspan is zero.

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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The flooring of a warehouse is made up of double – tee joints as shown in Figure-1. The joints
are simply – supported on a span of 8 m and are pre – tensioned with one tendon in each stem
with an initial jacking force of 750 kN each, located 75 mm above the bottom fiber, loss of
prestress at service loads is 20%. The properties of the section are as follows:
Total Area = 220,000 mm
1 = 1,890 × 10° mm*
DL = 2.5 kPa
LL = 6 kPa
yc = 24 kN/m
x = 2.5 m
y: = 90 mm
y: = 270 mm
ya = 75 mm
y1
N.A.
y2
Уз
Figure-1
1. Determine the initial stress at the bottom fibers due to prestressing force alone.
2. Determine the stress at the bottom fiber due to service load and prestressing force.
3. Calculate the additional load the floor can carry so that the stress at the bottom fibers at the
midspan is zero.
Transcribed Image Text:The flooring of a warehouse is made up of double – tee joints as shown in Figure-1. The joints are simply – supported on a span of 8 m and are pre – tensioned with one tendon in each stem with an initial jacking force of 750 kN each, located 75 mm above the bottom fiber, loss of prestress at service loads is 20%. The properties of the section are as follows: Total Area = 220,000 mm 1 = 1,890 × 10° mm* DL = 2.5 kPa LL = 6 kPa yc = 24 kN/m x = 2.5 m y: = 90 mm y: = 270 mm ya = 75 mm y1 N.A. y2 Уз Figure-1 1. Determine the initial stress at the bottom fibers due to prestressing force alone. 2. Determine the stress at the bottom fiber due to service load and prestressing force. 3. Calculate the additional load the floor can carry so that the stress at the bottom fibers at the midspan is zero.
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