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Purlins Meet The Structural Requirements


The purlins are a building noun, along the length of the roof distribution of the horizontal components, located on the main rafters, supporting the secondary rafters. Purlins roughly divided into the main purlin and sub-purlin, mainly used in some housing decoration and other fields.

Purlin features

1, purlins are horizontal parts along the length of the roof distribution, located on the main rafters, supporting the secondary rafters. Ancient houses used to stir up rafters, Purlin made of roof of the crossbar, is one of the main building blocks, also known as truss

In the slope of the roof is often placed on the roof or inclined beam, Purlin which on the plate and waterproof layer, as the water along the dependent components.

Modern steel structure construction generally C / Z steel, H-shaped steel as the purlins, have better tolerance

Domestic purlins processing base mainly in Jiangsu Qianqiao, Purlin more well-known manufacturers have Bai'an of light steel structure Products Co., Ltd., Wuxi Hengchang Steel Co., Ltd., Wuxi United Steel Co., Ltd., etc.

2, purlin classification

Steel structure of the internal support components, high-strength galvanized steel plate by precision machining cold-rolled into C and Z steel.

Purlin with the main purlin and sub-purlin of the points.

The main purlins are connected to the roof and the external structure of the pillars. The purlins are used to connect the roof panels and the outer wall panels to the foundation structure. Purlin The main purlins are the main structural components commonly used in modern steel structure design.

Some construction measures of purlins

When the purlins span greater than 4m, should be in the purlin between the cross-set position. When the purlins span 6m, should be in the purlin span three points to set a bar.

The effect of the pull is to prevent the purlin from being laterally deformed and twisted and providing an intermediate fulcrum in the x-axis direction. The force of the intermediate fulcrum needs to be transmitted to a larger member. For this purpose, Purlin a stay and a stiff stay are required at the roof or cornice.

When the wind suction exceeds the permanent load on the roof, the lateral force points to the opposite. At this time Z-shaped steel sandbar of the oblique bar need to be set in the roof, while the curling groove purlins are required to be located in the eaves.

Therefore, in order to take into account the two cases, in the wind load in the area or in the roof and roof are set at the oblique bar, Purlin or the cross bar and the stay are made both tensile and pressure bearing rigid rod The

Strip is usually made of round steel, round bar diameter should not be less than 10mm. Round bar can be set in the purlin from the flange on the flange 1/3 height range.

When the wind suction under the purlin under the flange pressure, the roof should be directly with the self-tapping screws connected with the purlin, Purlin pull the bar should be located in the vicinity of the lower flange.

In order to take into account both windless and windy circumstances, can be in the upper and lower flange near the arrangement.

1, according to the characteristics of force, purlin should be two-way bending components for internal force calculation and cross-section design.

2, purlin In the internal force analysis, the internal force calculation and the arrangement of the bar, when the layout of one or two pull, Purlin the horizontal load qx under the action of two or three spans continuous beam calculation.

3. Strip arrangement should take into account the impact of wind load, according to the actual force to calculate the strip section, and meet the structural requirements.

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