TGPSC HMWSSB Manager 2015 Paper 2 · Question 21

Question 21 of the TSPSC Manager (Engineering), HMWSSB, 2015: Paper 2 (Civil Engineering) (1 November 2015). Try it first, then open the answer and explanation.

1. Manager 2015 Paper 2 (Civil) · Q21 · Transportation Engineering · Highway Engineering

   In the rigid pavement fatigue analysis, the ratio of flexural stress due to load and the flexural strength due to concrete is less than 0.45 indicates

   1. the allowable number of repetitions of the axle loads is infinity
   2. the allowable number of repetitions of the axle loads is zero
   3. the allowable number of repetitions of the axle loads is 4500
   4. the allowable number of repetitions of the axle loads is 45000
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   Answer: (1) the allowable number of repetitions of the axle loads is infinity

   In IRC:58 fatigue analysis, when the stress ratio (flexural stress/modulus of rupture) is below 0.45 the concrete can withstand an unlimited number of load repetitions. Such axle loads therefore consume no fatigue life.

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