What Is a Steel-Plate Composite Shear Wall?
A steel-plate composite (SPC) shear wall sandwiches a steel plate between concrete wythes (or fills a steel sandwich with concrete) — combining steel's tensile ductility with concrete's compressive strength and stiffness. The composite action delivers exceptional seismic performance: high strength, high stiffness, and ductility in a thin profile. Used in high-seismic high-rises, nuclear facilities, and protective structures.
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How composite walls work
The steel plate carries tension and shear; the concrete prevents the plate's buckling (the concrete's restraint lets the thin plate reach its full yield strength — the composite advantage over bare steel plate walls); shear studs or tie bars bond the materials. In earthquakes, the steel yields in a stable, ductile manner while the concrete provides the stiffness and fire protection. The wall is thinner than reinforced concrete for the same strength — leasable area gained.
Variants
Concrete-filled steel sandwich (two steel faceplates with concrete between — the nuclear-plant standard, AISC N690), steel plate with one-sided concrete (retrofit application — plating existing concrete walls), and double-skin composite (the high-rise variant). Each has its connection detailing (the plate-to-boundary connections, the stud layouts) and its design provisions (AISC 341 for seismic, AISC N690 for nuclear).
Design and construction
The engineer designs the composite section (plate thickness, concrete strength, connector layout for full composite action), the boundary elements (collecting the wall's forces), and the connections (welded or bolted plate splices — the QC-intensive work). Concrete placement between plates needs self-consolidating concrete (vibration is impossible in the sandwich) and pour sequencing preventing plate deformation. Special inspection covers welding, stud installation, and concrete consolidation.
The bottom line
Steel-plate composite walls combine steel ductility with concrete stiffness in thin profiles — for high-seismic high-rises and nuclear facilities. Design per AISC 341/N690; place concrete as SCC.
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