¿Qué son las correas en una estructura metálica?

Las correas en una estructura metálica son los elementos que soportan la cubierta y la fachada metálica, es decir, que soportan el paquete de cubierta o fachada. Las correas metálicas son fundamentales para proporcionar estabilidad y resistencia estructural, distribuyendo las cargas de la cubierta a los elementos principales del marco de la estructura.

¿Qué es el efecto sheeting?

El efecto sheeting, también conocido como efecto diafragma, es la rigidez aportada por el cerramiento de la cubierta. Este efecto se debe a la rigidez rotacional provocada por el cerramiento de la cubierta, el elemento de unión entre este cerramiento y la correa, y la propia distorsión del perfil de la correa. Este fenómeno es crucial para la estabilidad y el comportamiento dinámico de las estructuras metálicas.

¿Realizáis cálculo para correas de cubierta?

Sí, en Jansa Metal realizamos cálculo de correas para todo tipo de cubiertas metálicas. Nuestro equipo de ingenieros se asegura de que las correas sean diseñadas y dimensionadas correctamente para soportar las cargas específicas de cada proyecto, garantizando así la seguridad y durabilidad de la estructura.

¿Qué es una correa tipo Z, C y Sigma?

Una correa tipo Z, C y Sigma es un perfil laminado en frío obtenido a partir de una chapa galvanizada, conformado para tener unas propiedades mecánicas óptimas para su uso en fachadas o cubiertas. Estos perfiles se diferencian por su geometría: Correa tipo Z: Tiene una forma en "Z" y se utiliza comúnmente en aplicaciones donde se requiere solapamiento. Correa tipo C: Tiene una forma en "C" y es ampliamente utilizada en la construcción de marcos y refuerzos. Correa tipo Sigma: Tiene una forma en "Σ" y ofrece una combinación de alta resistencia y rigidez, adecuada para diversas aplicaciones estructurales. Estas correas son esenciales en la construcción de estructuras metálicas debido a sus propiedades mecánicas y facilidad de instalación.

¿Ofrecéis cálculo para cualquier tipo de cubierta metálica?

Sí. Dimensionamos correas para cubiertas ligeras, industriales, inclinadas, planas o curvas. Nos adaptamos a cualquier geometría.

¿El cálculo tiene en cuenta la normativa vigente?

Por supuesto. Todos nuestros cálculos cumplen la normativa estructural aplicable (CTE, Eurocódigo, NTP, etc.), y siempre se revisan por un ingeniero especializado.

Calculation of metal purlins with diaphragm effect (sheeting)

ENGINEERING AND DESIGN

Structural calculation

CALCULATION OF PURLINS
Z, C, ∑

Connection design and calculation

Schemplan design
(preliminary project)

IFC render and project

Executive manufacturing project

3D IFC model for assembly

FIRE RESISTANCE CALCULATION

The calculation of steel purlins allows no room for error.

A failure here compromises the entire stability of the structure.

At Jansa Metal, we design and calculate Z, C and Sigma (∑) type metal purlins applying the diaphragm effect (sheeting), improving the overall rigidity of roofs and façades.

We calculate purlins optimized to withstand wind, snow, accidental loads, and deformations, ensuring a structural behavior that is safe, efficient, and durable. We reduce risks, optimize materials, and increase the service life of the structure.

👉 Are you looking for a reliable technical calculation for your steel purlins?

Why choose Jansa Metal:

Because we combine engineering, experience, and common sense.
With over 35 years in the steel structure sector, we know what works on site and what doesn’t.

These are our strengths:

Specialized calculation with sheeting effect.

We master all types of purlins: Z, C, and Sigma (Σ).

Design adapted to the reality of each project.

Technical rigor with a practical vision.

How do we do it?

Our Step-by-Step Method

At Jansa Metal, the calculation of steel purlins is a professional service with a technical process validated by years of experience.

Initial Technical Study: We review the type of structure, roofing, expected loads, and regulatory requirements.

Selection of the Optimal Profile (Z, C, or Sigma): Based on geometry, overlaps, spans, and client needs, we select the most suitable profile type.

Structural Calculation with Sheeting Effect: We integrate the effect of the cladding and the rigidity of the connections to optimize the behavior of the purlin as part of the structural system.

Technical Report and Recommendations: We deliver drawings, calculations, and construction recommendations. Everything is prepared for fabrication and assembly without surprises.

Request your personalized structural calculation now >>

“There are details that cannot be left to chance. At Jansa Metal, every structural calculation is done with millimeter precision. And even though steel purlins aren’t always seen, they are key: they distribute the roof load and keep the entire structure firm. That’s why we don’t improvise. We perform a rigorous study, because we know that strength starts from within.”

FAQ’s

What are purlins in a steel structure?

Purlins in a steel structure are the elements that support the roofing and metallic facade—that is, they support the roof or facade package. Metal purlins are fundamental in providing stability and structural strength, distributing the roof loads to the main frame elements of the structure.

What is the sheeting effect?

The sheeting effect, also known as the diaphragm effect, is the rigidity contributed by the roof cladding. This effect is due to the rotational stiffness caused by the roof cladding, the connecting element between this cladding and the purlin, and the purlin profile’s own distortion. This phenomenon is crucial for the stability and dynamic behavior of steel structures.

Do you perform calculations for roof purlins?

Yes, at Jansa Metal, we perform purlin calculations for all types of metal roofs. Our team of engineers ensures that the purlins are correctly designed and dimensioned to support the specific loads of each project, thus guaranteeing the safety and durability of the structure.

What are Z, C, and Sigma-type purlins?

A Z, C, and Sigma type purlin is a cold-formed profile obtained from a galvanized steel sheet, shaped to have optimal mechanical properties for use on facades or roofs. These profiles differ in their geometry:

Z-type Purlin: Has a “Z” shape and is commonly used in applications where overlapping is required.
C-type Purlin: Has a “C” shape and is widely used in the construction of frames and reinforcements.
Sigma-type Purlin (Σ): Has a “Σ” shape and offers a combination of high strength and rigidity, suitable for various structural applications.

These purlins are essential in the construction of steel structures due to their mechanical properties and ease of installation.

Do you offer structural calculations for any type of metal roof?

Yes. We dimension purlins for light, industrial, pitched, flat, or curved roofs. We adapt to any geometry.

Are the calculations carried out in accordance with current regulations?

Of course. All our calculations comply with the applicable structural regulations (CTE, Eurocode, NTP, etc.), and are always reviewed by a specialized engineer.

Ready for the First Step? Contact us!

Every great project starts with a conversation. Contact us, and find out how we can bring your idea to reality, with metal structures that are as solid as your expectations.

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