ACI Concrete Strength Testing Technician Practice Test

What should the design of the spherically seated bearing block avoid when at maximum load?

1. Sliding between blocks

2. Permanent deformation of the contact area

3. Air entrapment

4. Excessive friction

The correct answer is: Permanent deformation of the contact area

The design of the spherically seated bearing block should specifically avoid permanent deformation of the contact area when at maximum load because permanent deformation can significantly affect the performance and safety of structural components. If the contact area between the bearing block and the supporting structure deforms permanently, it might lead to misalignment, increased wear, and could compromise the load transfer mechanism over time. This could adversely affect the overall integrity of the structure, resulting in potential failures or reduced lifespan. The avoidance of permanent deformation is crucial in ensuring that the bearing block maintains its designed load-carrying capacity and operates as intended throughout its service life. Ensuring the material used in the bearing block and the surface treatment allow for elastic deformation up to the maximum load can help preserve the functionality and structural stability of the component.