If the middle pin support is not placed in the model, then the resulting moments and shears match up closer to that of the soil spring support condition. See reactions below for supports below each wall. no net zero support forces), and moments and shears that are slightly different (5-10%) from that of a model that uses soil spring supports. If a pin support support is placed below the middle wall it results in forces at the pin support (i.e. If doing the method where an equal but opposite reaction is applied, is a pin support placed below the middle wall? or is it left out like shown below. ![]() My question is how to go about this approach when modelling a double cell box culvert. (The assumption is that the soil below provides a uniform reaction force).įor a single cell box culvert, this method gives resulting moments and shears that are virtually identical (within 0.1%) to if you were to place soil springs underneath the bottom slab as the support conditions, and apply no external upwards reaction force.įor the single cell culvert with pin supports, the equal but opposite upwards force in a net zero change at the supports, thus there is no reaction. ![]() When analyzing a box culvert I know the trend is to apply an equal but opposite upwards force on the bottom slab to model the reaction of the downwards forces and to place a pin support below the walls.
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