The change from unreinforced brick to reinforced brick masonry buildings occurred when?

• A. 1920s
• B. 1950s
• C. Mid 1930s
• D. Early 1900s

Answer: (C)

The main idea here is when brick walls started being built with structural reinforcement to improve their ability to carry tensile and shear forces, not just compressive load. Unreinforced brick walls are strong in compression but brittle in tension, so they crack and can fail suddenly under bending, seismic, or dynamic loads. Introducing steel reinforcement—in bars, grids, or lattice within the masonry and grout—gives walls a ductile path to carry tension and better distribute forces, greatly improving overall performance.

That shift happened in the mid-1930s, when engineering practice and building codes began routinely incorporating reinforced brick masonry. This period marks the transition from relying on the mass and compressive strength of brick to actively resisting tensile stresses through reinforcement. By the 1950s, reinforced brick masonry was well established, but the changeover by then had already occurred.