Believe it or not the barn pictured below holds 12000 bu of corn on one side of it. Built similar to yours, only 60 years older probably, it has two foot concrete walls with 8 foot of plywood on top of that. Walls are 2x6 with an old hay loft so it is tied together by the floor of the hay loft. We pile grain 10 foot high. If I remember correctly most of the weight of the grain is down (to the floor not outward). But still you should be able to tie your walls together with cable every 2 foot. I would build some sort of bracket to bolt to each stud on both sides and run a cable with a turn buckle to hold everything together.
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How much load can my shop walls take for grain storage?
