For slabs spanning in two directions for calculating the span to effec...
Answer:
Calculation of span to effective depth ratio for slabs spanning in two directionsWhen calculating the span to effective depth ratio for slabs spanning in two directions, the shorter span should be considered. This is because the shorter span is the critical span and will govern the design of the slab.
Reasons for considering the shorter span:1. Deflection: The shorter span will have a higher moment and therefore a higher deflection. The deflection of the slab is governed by the shorter span, and it is important to ensure that the deflection limit is not exceeded.
2. Crack width: The shorter span will also have a higher shear force, which can cause cracking in the slab. The crack width is also governed by the shorter span, and it is important to ensure that the crack width limit is not exceeded.
3. Load distribution: The shorter span is the critical span for load distribution. The loads from the longer span are transferred to the shorter span, and it is important to ensure that the loads are distributed correctly.
Conclusion:In summary, when calculating the span to effective depth ratio for slabs spanning in two directions, it is important to consider the shorter span. This is because the shorter span governs the design of the slab, including deflection, crack width, and load distribution.