What is a common effect of high heat conditions on building materials?

High heat conditions can significantly affect the structural integrity of building materials. When materials are exposed to elevated temperatures, they often experience changes that can diminish their strength and stability. For instance, many materials, such as steel, concrete, and wood, can lose their load-bearing capacity when subjected to extreme heat. Steel can lose up to 50% of its strength at around 1,100°F, which can lead to bending or deformity. In the case of concrete, intense heat can cause it to spall or crack, further compromising its structural integrity. As a result, these weakened materials can lead to a risk of collapse, especially in scenarios such as fires. Therefore, the potential for collapses due to the weakening caused by high heat conditions makes this answer particularly accurate.