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Yes.
The weak point will be how the decor panels are attached to the carcasses, because this is where the combined weight of the shelves and books will be held. I usually use 6 4 X 25mm screws. Bear in mind it's not just the screws holding the weight though as the screws are pulling the panels into the side of the cabinet and create a fair amount of friction.
As far as the pins go chipboard handles compression forces very well, it's basically chips of wood glue together under a lot of pressure. This means there is no grain to split 5mm shelf pins have a stated maximum load of 12.5 kg per pin so if you put 6 pins per shelf in then the shelf+ load can be 75kgs. Would strongly recommend you make a jig for the holes from a bit of 2x1" or an offcut. This guarantees that all the pins will be at the same height.
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Bobbo
You say shelf pins - could that really work for 220 x 570 x 37mm blocks of worktop?
So basically I could just drill parallel holes in the sides and shove in a couple of shelf pins?