A disposable plate is a type of plate that falls under the classification of plate. The other most popular type of card is the bidirectional card. The load distribution of the slab is the factor taken into account when classifying slabs.
Simply put, the load is distributed in one direction with the unidirectional plate, while the load with the bidirectional plate is distributed in both directions.
Plate classification
The following figure shows the two main types of disks
The main criterion for classifying the plate is the gap ratio, that is, the relationship between the large and small gaps.
If (long span / short span) > 2
These types of plates are classified as disposable plates.
If (long period/short period) ≤ 2
These plates are classified as biaxial plates.
As shown in the figure above, when the plate is tensioned in one direction, the load is transferred in one direction.
Design of uniaxial slab roofs
The design is not as complicated as the bidirectional plate because the charge transfer occurs in one direction. A simplified method or a computational analysis method could be used to calculate the bending moments.
A strip can be analyzed manually or using a computer to determine bending moments. The same can be used to calculate reinforcement requirements.
The deflection of the plate must be checked in the short direction. The other direction need not be taken into consideration. The main reinforcement must be provided in the short direction. Minimal reinforcement may be provided in the larger span.
The same reinforcement details apply to the single-axis plate elements and the two-axis plate.
Below are some important facts about disposable plates.
- Load transfer in one direction
- They are economical if the span is 3.5 m. Furthermore, they are not more economical.
- Categorized if the ratio of long to short spans is greater than 2.
- Reinforcement is carried out in the shortest direction of the flexural reinforcement.
