Portal Frame Roof Structure

Portal steel frame refers to the use of welded or hot rolled h section steel as the main load bearing framework and cold formed thin wall steel c z section steel or channel steel as purlins and wall girt.

Portal frame roof structure.

The bearing structure of portal frame formed by h section steel frame and foundation portal frame bearing frame bracing roof purlin wall girt and corrugated single color sheet connected with each other formed enclosured building portal frame according structural plan could divided as single clearly span and multi span single clearly span max wide could reach 60m multi span each wide could reach 30m. Portal frames are generally low rise structures comprising columns and horizontal or pitched rafters connected by moment resisting connections. Typical portal steel frame. To ensure longitudinal stability which column bracing and roof bracing will arrange.

Steel portal frames in particular are a cost effective structural system to support building envelopes such as warehouses and shopping complexes requiring large column free spaces. It is a light weight building structure that uses corrugated single color sheet as the roof wall panel. Portal frame structures can be constructed using a variety of materials and methods. Portal frame structures are designed to span between supports and rely on fixed joints with moment resisting capacity where vertical supports connect to horizontal beams or trusses.

These include steel reinforced concrete and laminated timber such as glulam. The portal frame divided into several forms 1. Types of portal frame pitched roof symmetric portal frame generally fabricated from ukb sections with a substantial eaves haunch section which may be cut from a rolled section or fabricated from plate. In general the loads and consequent deformations for these frames are in the plane of the structure and hence these are a plane frame structure.

They tend to be lightweight and can be fabricated off site then bolted to a substructure. Portal frames can be a simple and rapid form of structure to erect creating a wide clear span weather proof enclosure at low cost with little material. The portal frame structure is mainly composed of steel columns and roof beams and the frame is a plane loading system.