Type HA loads first appeared in 1945 and the concept of HB load was introduced in BS 153 in 1954. Type HA loads is the normal loading for United Kingdom and covers vehicles up to 44 ton. HA loads are represented by a uniformly distributed load with a knife edge load. HA loads have covered the following situations:
(i) More than one vehicle occupying the width of a lane;
(ii) Overloading in normal vehicles;
(iii) Impact load induced when car wheel bounce when traveling crossing potholes.
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This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.
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Why is it that the transition slab of a bridge is doubly reinforced whereas the design moment does not exceed the ultimate moment of resistance?
Why is it that HA loading not HB loading is taken into consideration when designing a transition slab?