Pc endurance board (solid board) wind and snow load bearing parameters

The load-bearing capacity and wind and snow loads of C solid board (PC endurance board)

Regarding the shape and size ratio of conventional daylight windows:

Daylight window panes come in many shapes, with quadrilaterals being the most common and usually rectangular. The size ratio of the four sides (width) a and (length) b of a rectangle is a crucial condition for determining the load-bearing capacity of the daylighting window pane (or any load-bearing component in any plane).

When a=b (i.e. square), all four load-bearing edges of the daylighting window evenly share the load, which is the best plan for the shape of the window pane. The stiffness and load-bearing strength of the daylighting window should preferably be in both directions. In fact, circular daylight windows have better performance because they do not have far corners.

As the ratio of a: b becomes smaller (such as 1:1.5), the impact of more support on the load-bearing capacity of the daylight window becomes smaller and smaller, until when a: b=1:2, the short edge has only a small impact on the load-bearing capacity of the daylight window and can be ignored. In such a ratio of length to width, it can be considered that the daylight window is only supported by two long edges and their ends, while the latter can only be considered as an additional safety supplement.

Regarding the load-bearing capacity of fixed lighting windows on four sides, three sides, and both sides:

In fact, daylighting windows not only need to be supported, but also need to be firmly clamped (fixed) along their edges. Clamping and fixing have a significant effect on the load-bearing capacity of daylighting windows. Daylighting windows that are clamped and fixed on all sides have the maximum load-bearing capacity. Reducing the number of edges for clamping and fixing will reduce the load-bearing capacity of the daylight window. When the design only requires clamping and fixing on both or three sides of the daylight window, the thickness of the daylight window should be increased or the allowable span should be reduced.

Table A. Wind/Snow Load Table. Conditions: Flat, four sided fastening, single layer board, single span.

The maximum recommended span of daylight windows with different aspect ratios between supports and under gradually increasing (from light to heavy) wind/snow loads (for shorter sized daylight windows):

Maximum Support Span and Daylight Window Width of Endurance Plates with Different Aspect Ratios for Uniformly Distributed Wind/Snow Load Kg/㎡ with a Thickness of mm (mm)

Aspect ratio 1:1 to 1:1.2 Aspect ratio 1:1.2 to 1:1.5 Aspect ratio 1:5 to 1:1.8

450120011501050

80115010501000

12010801020920

1501020980880

200980880800

650165015801520

100148014201350

150132012501180

200120011201020

2501080980880

300920850750

850205019201780

80182017501620

120175016201480

150162014801320

200148013501180

250135012001050

30012201080920

1250205020502050

100205020502050

150205019201880

200118017201150

250172015801400

300155014201220

1. For daylight windows with a width to length ratio less than 1:1.8, refer to "Table B. Load Table for PC Endurance Panels with Flat and Two Faces Tightened"

The thickness of the board in the table starts from 4mm, which is the minimum thickness that can ensure the permanent quality of the daylighting window. Thinner boards can be used in places such as billboards, advertisements, vacuum forms, agricultural structures, and temporary tents.

Table B. Wind/Snow Load Table. Conditions: flat, two sided fastening, single layer board, single span.

The maximum recommended span of daylight windows with different aspect ratios between supports and under gradually increasing wind/snow loads: Note: The previous overall description of daylight windows and the description in Table A are also applicable to this table.

Uniform load (kg/㎡)

Maximum support spacing (width of daylight window mm)

Thickness type (mm)

4mm5mm6mm8mm10mm12mm

507809801120180019502050

806808201150168018502050

1006207001080155017802020

120580620980140017001950

150420580850118016001780

200 not applicable 420 650 1050 1480 1550

250 not applicable not applicable 450 950 1280 1350

300 N/A N/A 820 1080 1200

Notes to the conventional load table:

① When the middle part of each span bears the specified load, the PC solid flat panel table below is based on the widely accepted maximum deflection of the daylight window, which is 1/20 or 5% of the span. This ratio does not cause the daylighting window panel to malfunction or damage in a short period of time, and is also applicable to plastic daylighting windows. The span mentioned in the table already includes the impact of a safety factor of 1.7.

② The high elasticity and extrusion properties of plastic result in a higher deflection ratio compared to other conventional building materials such as glass. However, this deflection ratio does not cause any damage to the daylight window, and when the load disappears, the daylight window will return to its original position.

③ The high elasticity of plastic requires larger grooves and joint depths to be reserved for PC solid flat panel lighting windows, ensuring reliable reserved positions for installation and preventing the lighting windows from being out of place due to improper deflection and shortening.

④ The higher thermal expansion rate of plastics requires a larger gap margin to be reserved for PC solid flat plates to ensure sufficient thermal expansion, prevent distortion and possible deformation.

⑤ The installation details of other daylighting windows (such as clamping, sealing, etc.) are similar to the common methods of glass daylighting windows, in addition to the special installation points of plastic materials mentioned elsewhere in this instruction.

⑥ The data in the table is based on professional skills and expert opinions, integrating knowledge and experience. Actual experiments were conducted using sample daylight window panels, and performance, interpolation, and empirical estimation were similar to other products.

⑦ The PC solid flat panel table starts with a thickness of 4 millimeters and uses this thickness as the minimum recommended thickness for permanently using quality daylight windows. 1 to 3mm boards are suitable for signage, advertising, vacuum form objects, agricultural structures, exhibition tents, etc.

⑧ A PC solid flat panel can withstand a greater load before deformation, but improper shortening caused by excessive deflection may occur when the load-bearing framework is pulled out when the edge of the daylight window slides out.

⑨ Additional internal supports, such as those perpendicular to the main rafters or arched supports, can enhance the carrying capacity of snow loads when needed, but remain unchanged when there is an upward wind load. This structure is suitable for heavy snow areas where the upward wind pressure is relatively gentle.

When making this selection, each item should be calculated separately according to the relevant conditions.