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BEIHAI YUEDA FRP PRODUCTS
Methods to Improve the Bending Performance of Pultruded Fiberglass Grating
Release time:
2021/01/28
Pultruded fiberglass grating is a flat panel made by assembling three different cross-sectional shapes of pultruded fiberglass profiles in a specific manner, creating spaces within the panel. Due to its excellent properties such as corrosion resistance, flame retardance, lightweight high strength, aging resistance, insulation, slip resistance, safety, and aesthetic appeal, it is widely used in industries such as chemical, petroleum, papermaking, metallurgy and power generation, aquaculture, and wastewater treatment. However, in practical applications and performance testing, it has been found that although pultruded grating has better structural integrity and strength compared to molded grating, there are still issues of insufficient strength and significant deformation in certain special usage scenarios. During installation, it is necessary to appropriately increase the support.
Pultruded fiberglass grating is a flat panel with spaces, assembled in a specific way using three different cross-sectional shapes of pultruded fiberglass profiles. Due to its excellent properties such as corrosion resistance, flame retardance, lightweight high strength, aging resistance, insulation, slip resistance, safety, and aesthetics, it is widely used in industries such as chemical, petroleum, papermaking, metallurgy and power generation, aquaculture, and wastewater treatment.
However, in practical applications and performance testing, it has been found that although pultruded grating has better strength than molded grating due to its structural characteristics, there are still issues of insufficient strength and significant deformation in some special usage scenarios. During installation, it is necessary to appropriately increase the number of metal beams to reduce deformation, which causes unnecessary trouble in construction. Excessive deformation gives a sense of insecurity when the grating is used as a pedestrian walkway or platform, severely affecting the performance of the grating and expanding its application areas. Therefore, improving the bending performance of pultruded fiberglass grating is the primary issue that needs to be addressed.
1,Choose a reasonable cross-sectional shape for the pultruded profile.
The pultrusion process for fiberglass is particularly suitable for manufacturing products with I-shaped, angle-shaped, channel-shaped, tubular, and round rod cross-sectional shapes. These products are all slender structures.In use, they can be regarded as rods or beams. Pultruded fiberglass grating takes advantage of the characteristics of pultruded profiles, optimizing them into a new type of mesh structure product. Therefore, the performance of pultruded fiberglass grating mainly depends on the bending performance of the pultruded profiles, namely bending strength and bending stiffness. The load-bearing bars in the grating are the main load-bearing components in practical use and can be regarded as simply supported beams, subjected to bending forces, resulting in a certain degree of deflection..
It can be seen that,under the same cross-sectional shape, considering strength, I-shaped is better than rectangular, rectangular is better than square, and square is better than round. As a combination product of several pultruded profiles, the grating should also consider various factors such as material properties, stiffness, and manufacturing processes. I-shaped cross-sections are better than rectangular cross-sections, but their forming process is difficult to control, so the reasonable shape and size of the cross-section should be comprehensively considered based on specific technical requirements, bending strength, deflection conditions, and processing difficulty..
2,Choose an appropriate grating combination method.
Different cross-sectional shapes of pultruded profiles,their combination structures also vary slightly. Currently, the commonly used types are wedge-shaped and tubular..
3,Reasonably configure the reinforcement materials for the pultruded profiles.
As the load-bearing bars of the pultruded profiles,the reinforcement materials should not only include alkali-free and untwisted coarse yarn but also be covered with a layer of continuous glass fiber mat on the outside. For example, I-shaped profiles can be fully covered with mat on the surface, or the two sides of the I-shaped profiles can be separately covered with mat; while hollow pipes can have reinforcement materials arranged in two ways: adding mat to the inner and outer layers and adding untwisted coarse yarn to the middle layer, or winding circumferential yarn in the middle layer. These forms are very effective in improving the transverse strength of the pultruded profiles and the overall bending performance of the grating..
4,Determine reasonable assembly process parameters for the grating.
(1)承重条立面打孔工艺要求
圆孔的圆心一定要在I字形型材或矩形型材的截面形心位置。这样可以减少承重件强度和刚度损失。圆孔大小要适中,过大的圆孔径造成承重件强度降低；而过小的圆孔径则不利于中间联接条的插人,影响组装.
（2）联接条的间距及格栅空隙率的设计
联接条的间距大小决定着承重件立面打孔的疏密的程度及整个格栅的性能,一般根据实际使用情况及理论计算,选择150mm或是30mm为最佳,既能保证格栅的性能要求,又能节省材料,降低成本。格栅的空隙率是指格栅板上表面的空隙面积与格栅板表面积之比,与承重条之间的中心距有关。一般来说,中心距越小。格栅的强度和刚度越好,但还应根据具体的使用条件灵活掌握。如果作为人行栈道、平台使用,可将两个工字钢边缘距离选在于20-30mm之间,通过实际应用,效果很好.
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