GATE CE 2019 Set 1 — Question 58
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Transportation Engineering → Pavement Design → Rigid Design (IRC)
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Question
Tie bars of diameter are to be provided in a concrete pavement slab. The working tensile stress of the tie bars is , the average bond strength between a tie bar and concrete is , and the joint gap between the slabs is . Ignoring the loss of bond and the tolerance factor, the design length of the tie bars (in mm, round off to the nearest integer) is ________
Correct answer
700 to 700
Solution
The total length of a tie bar () is the sum of the development lengths required on both sides of the joint plus the width of the joint gap.The development length () is given by:Where:
(diameter of bar)
(working tensile stress)
(average bond strength)Total length
Substituting the values:The design length of the tie bars is .
(diameter of bar)
(working tensile stress)
(average bond strength)Total length
Substituting the values:The design length of the tie bars is .
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