Return to overview Purlin and side rails systems METSEC Structural system for efficient solution of secondary steel constructions made of thin-walled Z and C sections completed with wide array of braces, rods, angle clips and anchor shoes. Structural systems METSEC — a name you can trust and which is a synonym for the efficient solution of secondary steel structures of hall constructions. Our existing results include thousands of successful deliveries of purlin systems for halls of various use and with the size ranging from several hundred square meters to huge logistic and shopping centers.
The individual elements are connected at nodes; the connections are often assumed to be nominally pinned. The external forces applied to the system and the reactions at the supports are generally applied at the nodes.
When all the members and applied forces are in a same plane, the system is a plane or 2D truss. The principal force in each element in a truss is axial tension or compression. Overview of trusses [ top ]Use of trusses in buildings Trusses are used in a broad range of buildings, mainly where there is a requirement for very long spans, such as in airport terminals, aircraft hangers, sports stadia roofs, auditoriums and other leisure buildings.
Trusses are also used to carry heavy loads and are sometimes used as transfer structures. This article focuses on typical single storey industrial buildingswhere trusses are widely used to serve two main functions: To carry the roof load To provide horizontal stability.
Two types of general arrangement of the structure of a typical single storey building are shown in the figure below.
Typical truss building arrangements Lateral stability provided by portal trusses. Longitudinal stability provided by transverse wind girder and vertical cross bracings blue No longitudinal wind girder.
Building braced in both directions. Lateral stability provided by longitudinal wind girder and vertical bracings in the gables blue Longitudinal stability provided by transverse wind girder and vertical bracings green In the first case left the lateral stability of the structure is provided by a series of portal trusses; the connections between the truss and the columns provide resistance to a global bending moment.
Loads are applied to the portal structure by purlins and side rails. In the second case, right each truss and the two columns between which it spans, constitute a simple structure; the connection between the truss and a column does not resist the global bending moment, and the two column bases are pinned.
Bracing in both directions is necessary at the top level of the simple structure; it is achieved by means of a longitudinal wind girder which carries the transverse forces due to wind on the side walls to the vertical bracing in the gable walls.
Longitudinal stability is also provided by a wind girder in the roof and vertical bracing in the elevations. Under gravity loads, the top and bottom chords of the truss provide the compression and tension resistance to overall bending, and the bracing resists the shear forces.
A wide range of truss forms can be created. Each can vary in overall geometry and in the choice of the individual elements. Some of the commonly used types are shown below.
In a conventional Pratt truss, diagonal members are in tension for gravity loads. This type of truss is used where gravity loads are predominant see below left. An alternative Pratt truss is shown below right where the diagonal members are in tension for uplift loads.Metsec Z-section steel purlin profiles are manufactured from pre-hot dipped galvanised steel, G coating and with a minimum yield strength of N/mm².
Further information on all of the following zed purlin systems and their applications can be found in our Purlin Technical Manual. voestalpine Metsec the UK’s largest specialist cold roll forming company Providing products for the construction and manufacturing industries.
We focus on adding value through expert design, precision manufacturing and on-time in full product delivery. Lattice beam technical manual Joists, trusses and complete frame installation service.
1. Metsec plc Metsec plc is the UK’s largest specialist cold When used in conjunction with Metsec Z-section purlins the design of deep valley gutters can be simplified. torosgazete.comtion Manual v8i.
Slab on Grade Excel Sheet. Pinned Base Plate(Rs Shear Key) slab on grade reinforcement.
Handbook of Construction Tolerances. A Simple Guide to the Direct Analysis Method.
an eaves strut may also be required to suit the design of the Metsec eaves beam. 2. Lattice beam technical manual Joists, trusses and complete frame installation service. 1. Metsec plc Metsec plc is the UK’s largest specialist cold When used in conjunction with Metsec Z-section purlins the design of deep valley gutters can be simplified.
from design defects. Contact Steadmans for more information about the warranties. introduction. purlins, rails & eaves beams overview purlins, rails & eaves beams 04 Eaves beam Sleeve Wall cladding Roof cladding purlins, rails & eaves beams beam == C A C L.
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