What is the difference between h20 and hs20 loading

A comparison of old versus new indicates that the difference is very small. The extra pound wheel load is not a large increase and will only affect those designs that did not have excess capacity. Wheel loads affect the top slab design more than wall and bottom slab. This is especially true where the slab is less than 2 feet below grade. The effect of the wheel load on the slab decreases as depth of cover increases.

It can be concluded that the new loads may affect existing designs, but the difference between old and new does not mean that all designs need to be updated. The small increases will not affect designs that have excess capacity. Those designs that minimized reinforcing steel and slab thickness to create a structure that was just good enough may need to be reviewed. These conclusions are based on a comparison of wheel loads and do not include the many other factors used in design.

Items such as impact, depth of cover, load and resistance coefficients all play a part in the final design. Some of the steel areas required in the newer specifications are less than steel areas required in the older specification. This comparison confirms that the new HL93 loading is not meant to cause redesign of underground precast structures.

Gary K. Munkelt is a consulting engineer with Gary K. Contact him at [email protected]. Dear Gary I wish could exchange some thoughts about prestressed concrete beams for pre cast bridges of span as such 50 feett span and width 30 feet and what size of beam is more apppropriate to use as per the HS loading. I saw some table ,maybe I will use it. I am from Brazil Thank you Merru Easter. What should be the thickness of slab and size of reinforcing steel bars for a pipe trench concrete cover, wherein, a truck with total axle loads of 45 tons will pass over it?

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