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# How to calculate load distrubution under concrete protection slab on pipe in trench

## How to calculate load distrubution under concrete protection slab on pipe in trench

(OP)
Hi

I should install a repartition concrete slab over pipe along the road. i have 2 problems:
1- how can i calculate trafic load/m² over slab
2- how can i calculate load distrubution generated by slab/m² over pipe.

Thank you for your help ,

### RE: How to calculate load distrubution under concrete protection slab on pipe in trench

I don't know the need of concrete slab over pipe along the road. It depends on depth of the buried pipe, type of the pipe, and material it conveys. For other 2 questions, you should check AASHTO code for traffic load, and I believe they have a section for distributing traffic load to the buried pipe.

### RE: How to calculate load distrubution under concrete protection slab on pipe in trench

(OP)
@r13 (Civil/Environmental)

I am thinking about the beahvior of slab installed at mid-depth of trench on stress distrubution above the pipe.

How the slab reduce the load distrubution above pipe??

### RE: How to calculate load distrubution under concrete protection slab on pipe in trench

sali123,

I don't not follow your statement "I am thinking about the beahvior of slab installed at mid-depth of trench on stress distrubution above the pipe." Can you elaborate, better with a sketch, on your another thread.

### RE: How to calculate load distrubution under concrete protection slab on pipe in trench

The slab should be thick enough to be considered rigid, then load below is equal pressure. As you go lower assume that effective width increases with depth and resulting pressure decreases.

See API 1102 "steel pipelines crossing roads", for more specifics.

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