As part of the ongoing push to use more timber in buildings, Skidmore, Owings & Merrill (SOM) has proposed the Concrete Jointed Timber Frame structural system, which recently underwent a series of physical load tests with successful results. This system employs mass timber for structural elements—beams, columns, shear walls, and floor planks—and reinforced concrete for connections. SOM's Benton Johnson says, "Almost every timber building utilizes a thin concrete topping slab for acoustic control. We think that you might as well make that slab structural and a composite, and then you can get longer spans that are more [typical] in construction."

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