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A load-bearing building system employing a plurality of standard steel columns and a plurality of precast reinforced concrete slabs of certain standard room sizes. A plurality of such slabs are mounted at every floor elevation in side by side relationship. Concrete is then poured between adjacent sl

A load-bearing building system employing a plurality of standard steel columns and a plurality of precast reinforced concrete slabs of certain standard room sizes. A plurality of such slabs are mounted at every floor elevation in side by side relationship. Concrete is then poured between adjacent slabs to provide, together with ribs of the slabs, a load-resisting space frame and floor decks serving simultaneously as horizontal diaphragms and room ceilings. The slabs are two-way flat plates having perimeter ribs reinforced with bars and light gauge corrugated steel which serve as shear reinforcement and as non-reuseable framework for the ribs. The slabs are each supported at four points. The space frame\s composite girders comprises steel reinforcement together with poured-in-place and prefabricated concrete acting integrally. This construction has special moment connections, providing positive bending in the girders, regardless of the horizontal load direction. A small variety of sizes of standard slabs and steel columns are capable of being assembled to form a large variety of different buildings.

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A load-bearing modular building system, comprising: a plurality of steel columns, a plurality of room-size prefabricated reinforced concrete slabs having depending ribs along the periphery arranged with adjacent slabs disposed in substantially edge abutting spaced relation, each of said slabs having

A load-bearing modular building system, comprising: a plurality of steel columns, a plurality of room-size prefabricated reinforced concrete slabs having depending ribs along the periphery arranged with adjacent slabs disposed in substantially edge abutting spaced relation, each of said slabs having a plurality of corners, each corner being supported from a column, said slabs being two-way reinforced concrete slabs having only perimeter ribs and a flat underside surface between said ribs, said underside surface suitable for use as a ceiling, said ribs being corrugated in a vertical direction on the outer surface thereof; and cast-in-place concrete poured between said adjacent slabs to form after hardening an integral horizontal diaphragm together with said slabs.