Which structural failure mode was most common in poorly designed Roman arches built on unstable ground?

💡 Explanation

When an arch rests on unstable ground, uneven settling causes asymmetric loading, resulting in increased lateral thrust forces that overcome the shear strength of the joints. Therefore shear failure results, rather than spalling, cracking or buckling, which require different stress distributions or environmental conditions.

• Which risk increased as 18th-century shipbuilders maximized cargo capacity in wooden hulls?
• Which approximation method did Islamic mathematicians use to refine iterative solutions of polynomial equations?
• Which effect occurred due to Ibn al-Haytham's improved lens grinding techniques used for early reading stones?
• Which mechanism limited initial Wright Flyer flights despite achieving sufficient lift?
• Which limiting outcome did annual flooding most directly prevent in pre-Columbian chinampa agriculture of the Valley of Mexico?
• Which mechanism enables lenses in historical Islamic dioptrics to focus and magnify objects?