Armadura Longitudinal (estim.)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
As
About this calculator
Longitudinal reinforcement is one of the main components of an steel beam, responsible for resisting longitudinal loads. To calculate the area of longitudinal reinforcement (As), it is necessary to know the moment of the section (Md), the yield strength of the steel (fyd) and the distance between the centroid of the section and the top of the beam (z).
The formula used to calculate the area of longitudinal reinforcement is As = Md/(0.85·fyd·z). This formula is based on the building codes for steel structures and takes into account the reduction of the steel strength due to the effect of compression.
Longitudinal reinforcement should be used in steel structure projects that support significant loads, such as bridges, high-rise buildings and other types of structures. In addition, it is important to consider common precautions when designing longitudinal reinforcement, such as choosing the type of steel and verifying the strength of the beam.
Frequently asked questions
What is longitudinal reinforcement?
Longitudinal reinforcement is the steel cover placed on the beam to resist longitudinal loads. It is essential to ensure the safety of the structure.
Why is it important to consider the strength of steel?
The strength of steel is essential to ensure the safety of the structure. If the steel does not have sufficient strength, the beam may not be able to withstand the loads and may collapse.
What is the moment of the section?
The moment of the section is the force that acts on the beam as a function of the distance between the centroid of the section and the top of the beam.
Why is it important to verify the strength of the beam?
It is essential to verify the strength of the beam to ensure that it can withstand the loads that the beam will support.