Florida Building Code Practice Exam

The minimum specified compressive strength of concrete in footings for structures in Seismic Design Category A must be at least?

1. 2,000 psi

2. 2,500 psi

3. 4,000 psi

4. 5,000 psi

The correct answer is: 2,500 psi

The minimum specified compressive strength of concrete in footings for structures in Seismic Design Category A must be at least 2,500 psi. This requirement is foundational to ensure that the concrete can adequately support structures while accommodating potential seismic forces, even when the seismic risk is relatively low compared to higher seismic categories. Choosing 2,500 psi aligns with the general guidelines established in the Florida Building Code, which considers both safety and economic factors. This strength level is necessary to ensure that footings can effectively transfer loads from the structure into the ground, maintaining stability and structural integrity. The other options suggest higher strengths that may be applicable in more critical seismic design categories, but the emphasis for Category A, where lower risks are present, is on achieving sufficient strength without overly excessive material usage, thus promoting efficiency and sustainability in construction practices.