Dynamic Load of airplanes on Bridge

[bridgesandtunnels]

I am reviewing a design for a major airport. The airport is extending one of the runways. To do this a concrete frame bridge is beign proposed. The roof of the frame structure will be covered with reinforced concerete pavement where the airplanes will land. Has this been done before?

 

[JedClampett]

I would be more worried about the load of the planes before they take off. I went to a presentation once regarding a rebuild of the first 1000 ft. (maybe 1500 ft.)of runway at O'Hare. The presenter kept on mentioning the loads of a plane taxiing before it takes off. I asked why he wasn't considering the load of a plane when it lands. His answer was that:
Planes weigh more when they take off than when they land since they're full of fuel.
The planes don't ususally touch down at the very beginning of the runway.
The pilots intentionally apply the load gradually to the runway to make a softer landing.
I know this doesn't answer your question, but maybe it will help.

 

[Ingenuity]

Part of this subject has been posted before in the BRIDGE ENGINEERING forum...check out

thread607-24641


HTH

 

[whymrg]

Table 5-10 of ACI 343R-95 shows Aircraft Loads and Wheel Spacings for different models. Section 5.10.2 statews that Impact for Touch-down areas of runways equal to 100 percent.

Also braking forces and failure load of the landing gear shall be considered.

Try to find or buy ACI 343R-95 "Analysis and Design of Reinforced Concrete Bridge Structures". Project budget should be able to cover this expense.

Good luck.

 

[austim]

I would use at leat 100% impact.

Under wet conditions, a good pilot will intentionally impact the runway quite severely, so as to avoid potential aqua-planing. I learnt that years ago when my plane landed at Hong Kong in a severe rainstorm. We barely knew when our plane had landed at Darwin, and were very impressed by the landing skill of the Qantas pilot; at Hong Kong we were violently shaken by the touch-down impact (and wrongly blamed it on misjudgement by the co-pilot).

And of course, human error and incompetence is always a possibility.