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The Supporting System In Portal Frame

- Jul 10, 2019 -
50% of constructional steel used is in portal frame construction. They are very efficient for enclosing large volumes, therefore they are often used for industrial, storage, retail and commercial applications as well as for agricultural purposes. This article describes the composition and function of Supporting system in portal frame.
The Function Of Supporting System In Portal Frame

1. Forming a longitudinal frame with the load-bearing frame to ensure the overall stability and longitudinal stiffness of the main frame during installation and usage.
2. Provide reliable support for the outer plane of the rigid frame or reduce the calculated length outside the plane of the rigid frame.
3. Bear the wind load on the gable at the end of the house, the horizontal load on the longitudinal direction of the crane and other longitudinal forces (such as temperature stress).
4. Bear the Longitudinal horizontal seismic action of houses in earthquake zones

The Composition Of Supporting System In Portal Frame
1. Horizontal support. The solid web frame should be supported horizontally on the upper flange of the beam. The horizontal support should adopt the X shape, and the components can be made of tensioned round steel or a thicker section steel,  such as angle steel.
2. Support between columns. It is necessary to design inter-column support in the plane of the longitudinal frame of the house. The supportbetween columns should also adopt an X shape, and the angle between the cross slanting bar and the horizontal plane should not be greater than 55°; I there is f no crane, or only a suspended crane, or only a non-heavy duty crane with a weight of not more than 5t, the column The inter-support can be made of tensioned round steel. In other cases, the inter-column support should be supported by a single-piece steel support or a double-piece steel support, and the intermediate cross-node plate and the two end joint plates should be welded firmly. When there is a crane beam or the height of the house is large, the inter-column support should be layered.
3. Horizontal tie rods. At the turning point of the steel structural member, that is, the joint between the beam and the column , it should be design with tie rod. The purlin that meets the slenderness ratio requirements can also be used as a horizontal tie rod.
Angle bracing. When the lateral flanges of the beams and columns need to be provided with lateral support points, the rafters or wall beams connected to the outer flanges can be used to set the struts. Angle bracing should be made of angle steel, which can be connected to the web near the inner flange, or can be connected to the inner flange. Usually, it is connected by a single bolt. The angle between the angle bracing and the webs of the rigid frame should not be less than 45°.

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