What is created by sandwiching steel between two wooden beams?

The correct answer is a Flitch Plate Girder. This type of girder is specifically designed by combining the compressive strength of wood with the tensile strength of steel. In a Flitch Plate Girder, a steel plate (the flitch) is sandwiched between two wooden beams, which provides increased strength and stability. The steel plate helps to resist bending forces while the wood provides compressive strength. This combination is particularly effective in applications where additional support is needed, such as in longer spans or heavier loads.

The design also allows for a more efficient use of materials, as it leverages the strengths of both components. By using a Flitch Plate Girder, structures can achieve greater load capacities without significantly increasing the weight or size of the beams. This makes them ideal for situations where space is limited or where reducing material costs is a priority.