Final answer:
True. A two-way concrete slab can be more efficient with a rectangular grid of supports due to better load distribution and structural integrity.
Step-by-step explanation:
True. A two-way concrete slab can be more efficient with a rectangular grid of supports compared to other configurations. This is because a rectangular grid provides better load distribution and structural integrity. The load is evenly distributed among the supports, reducing the risk of failure and providing stability to the slab.
For example, if you have a concrete slab supported by columns arranged in a rectangular grid, the load from above is distributed evenly to the columns, resulting in a more efficient use of materials and reduced chances of collapse. On the other hand, a different grid arrangement may result in uneven load distribution and increased stress on certain supports, decreasing the efficiency of the slab.