traffic guard load distribution
traffic guard load distribution
(OP)
i have a job whereby i have to account for vehicular barrier approx 4.5ft offset at p/l behind wall is approx 5.0ft high.
The owner Engineer has provided min 6000lbs load . My question is do i have to convert this concentrated load to lb/linear fit. The vehicular barrier wood post is encapsulated in a Concrete footing. How do i apply/disperse this load in my external stability calculation. The length of the wall is only 10.0ft
Without guard rail load my geogrid tie backs are approx 4.5ft long for a 5.5ft grading difference using LL surcharge 250psf.
The owner Engineer has provided min 6000lbs load . My question is do i have to convert this concentrated load to lb/linear fit. The vehicular barrier wood post is encapsulated in a Concrete footing. How do i apply/disperse this load in my external stability calculation. The length of the wall is only 10.0ft
Without guard rail load my geogrid tie backs are approx 4.5ft long for a 5.5ft grading difference using LL surcharge 250psf.





RE: traffic guard load distribution
If you were to design for the 6,000lb impact load I would use a 45deg distribution (in plan view) and apply it to that length of wall. So at 4.5' behind wall thats 2*4.5'=9', Then you'd have 6,000lb/9'=666plf of horizontal force.
EIT
RE: traffic guard load distribution
So in my External Stability calculation i will apply 666plf force & check my MSE wall against Base Sliding, Overturning the depth of Post footing wouldn't matter in this case as we are spreading this load uniformly longitudinally along wall length.
My concern is more of how would i transfer this load to the buried backfill.
RE: traffic guard load distribution
My assumptions are that the reinforced backfill will distribute the lateral force applied at the the gaurdrail post at a 45 degree angle. The distribution is through the soil and will act on the back of the wall. The wall then be restrained by the geogrid.
Not sure if that helps.
EIT
RE: traffic guard load distribution
I am wondering can i divide this load by depth of the post 6000lb/6ft=1000lb/ft assume this as a linear load & check for adequate external stability.
Thanks
RE: traffic guard load distribution
For your situation I would use the 45deg distribution along the length of the wall (in plan view) for external calculations. I am also assuming that the post (5'deep) will distribute to the total wall height, therefore I will use the total wall height to resit this force. I would apply the effective load (6,000lb/9ft) at the height of the gaurdrail and sum moments at the toe of the wall. I would not consider internal stability as the post is behind the reinforced zone. You could consider local unit connection or sliding but not pullout. I can go into more detail if I have time later today or tonight.
EIT
RE: traffic guard load distribution