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 bottomfibers at the midspan is zero. The flooring of a warehouse is made up of double – tee joints as shown in Figure-1. Thejoints are simply – supported on a span of 7.5 m and are pre – tensioned with one tendonin each stem with an initial jacking force of 745 kN each, located 75 mm above the bottomfiber, loss of prestress at service loads is 18%. The properties of the section are asfollows:• Total Area = 200,000 mm²• I = 1,880 x 106 mm*• DL = 2.3 kPa (excluding self – weight)LL = 6 kPakNYe= 24 KN/m3:2.4 m88 mmNA267 mm75 mmFigure-1

eb (eccentricity from bottom) = 267-75 = 192mm

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.

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.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

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.

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 7.5 m and are pre – tensioned with one tendon
in each stem with an initial jacking force of 745 kN each, located 75 mm above the bottom
fiber, loss of prestress at service loads is 18%. The properties of the section are as
follows:
• Total Area = 200,000 mm²
• I = 1,880 x 106 mm*
• DL = 2.3 kPa (excluding self – weight)
LL = 6 kPa
kN
Ye
= 24 KN/m3:
2.4 m
88 mm
NA
267 mm
75 mm
Figure-1

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