We are going to see concrete staircase reinforcement details, as well as the reinforcement of rods for concrete stairs with rest. Let’s see…
Design of Reinforced Concrete Stairs Examples
Main Types of Reinforced Concrete Stairs
Let’s see what are the main TYPES OF STAIRS of reinforced concrete, that is, the stairs that are built the most.
- Straight reinforced concrete staircase.
- Reinforced concrete staircase with two U-shaped sections, with a straight landing.
- Staircase with 3 reinforced concrete branches, U-shaped, with 2 landings.
- Staircase with 2 reinforced concrete branches, L-shaped, with 1 intermediate landing.
Reinforcement of Concrete Stairs
Structural Design of Reinforced Concrete Stairs PDF
Reinforcement of Concrete Stairs with Landing
Staircase Reinforcement Details with Landing
Section 1 with Structural Design of Reinforced Concrete Stairs PDF
Reinforcing steel should be of the corrugated or ribbed type (grade G-42 steel). The mix for the concrete must guarantee a compressive strength of 25.0 MPa (R’bk=250kg/cm²) after 28 days.
The maximum size of the coarse aggregate will not be greater than 20mm. The water-cement ratio will be around 0.55.
It is essential to respect the location and positioning of each reinforcing steel bar.
Similarly, the reinforcement cover must always be 30mm for elements on the ground and 50mm for those buried.
The casting or casting of the concrete must be monolithic, to obtain the best results.
Section 2 of Staircase Reinforcement Details with Landing
But really, the staircase to be built is inside this HOUSE DESIGN.
It is important to point out that, in all cases, splice and anchorage lengths of steel reinforcing bars are recommended, from 500 to 600mm as a minimum.
When you have already defined the entire design of the concrete staircase, you can immediately use this CONSTRUCTION MATERIALS CALCULATOR to find out the volume of concrete that your staircase requires, including materials such as cement, sand and gravel.
Single Section Reinforced Concrete Staircase
L-Shaped Staircase Reinforcement Details
Reinforcement of Rods for Concrete Stairs in L with Landing
Reinforcing steel should be of the corrugated or ribbed type (grade G-42 steel). The TYPE OF CONCRETE to be used must guarantee a compressive strength of 25.0 MPa (R’bk=250kg/cm²) after 28 days.
The maximum size of the coarse aggregate will not be greater than 20mm. The water-cement ratio will be around 0.55.
It is essential to respect the location and positioning of each reinforcing steel bar.
Similarly, the reinforcement cover must always be 30mm for elements on the ground and 50mm for those buried.
The casting or casting of the concrete must be monolithic, to obtain the best results.
To carry out the design of the structural reinforcement of the upper enclosure (lower level +2.25) and the corridor slab (upper level of the slab +2.75), the particular support conditions of the surrounding structural elements must be taken into account.
To see straight reinforced concrete STAIRS PLANS, you can visit this link.
How to Calculate the Steps of a Concrete Stair?
To calculate the number of steps, the height is taken and divided by the value set for the riser. To do this, it is better to use the BLONDEL’S THEOREM.
How to read the Plans for the Construction of a Reinforced Concrete Staircase?
All construction must start from the reading of plans to know that a good job is being done.
In the plans for reinforced concrete stairs, seen previously, the following information appears:
- Planimetric and altimetric heights. The planimetric dimensions for the construction are usually in millimeters, achieving greater precision. While elevations, for example, NPT (Finished Floor Level), are usually displayed in meters.
- The location of the start and where it ends.
- Plans with plan views, sections and detailed details.
- The type of landing, which are usually straight concrete slabs.
- The stairwell, when it has perimeter walls.
Tips when Building Stairs:
- Care must be taken in interpreting the plans for the construction of a staircase.
- All countersteps and risers will have the same measurement.
- It is important that a ladder is square, guaranteeing safety and comfort.
- The casting of the concrete must be carried out in a monolithic way.
Slab for Stairs: How to make the Slab for Steps and Counterpasses?
What is the Forging of a Stair?
It is the lining of the steps and counter-steps of this structure. This procedure is done with mortar made up of coarse/fine sand, cement and water, using the technique of troweling and rubbing.
How is the Forging of Steps and Countersteps made?
Start by etching the lateral sides with a etching mortar. Start with the second section and then the first section. You must follow the measurements indicated on the plans.
The rules are placed in the steps and countersteps based on the size of the strokes, leveled for the step and counterstep. The veneer that the staircase will have later should also be considered when leveling.
Mistakes to avoid in the Forging of Steps and Counterpasses
- Don’t make the mistake of only using fine sand for the forging. The ideal is to use 50% fine sand and 50% coarse sand. This is important because it is a transit structure, so it has to be comfortable and safe, both going up and down.
- Don’t forget that the first top rail, the one that reaches the second level, has less height than the landing of the rails. This is because the top floor is still to be finished.
As you do the steps and countersteps you must control the horizontality and verticality.
How to avoid mistakes when making the Slab and Crossovers of the Stair?
Before finishing, I leave you these tips so that mistakes like the ones I have told you about do not happen to you:
- The general level of work on the stairs always runs. This will make it aesthetic, as well as comfortable when going up and down.
- Make the layout of the stands so that the forging of the steps and countersteps is correct.
- Likewise, it is necessary to clean all the steps of the stairs before starting the forging, this is important so that the area does not burst or end up boxed in later.
- Always check the verticality (plumb), square, alignment and measurements of the stands.
- Always consider the centimeters of the upper floor in the first step of the upper part.
By following these tips, you will be able to obtain the best INTERIOR STAIR DESIGN.