Structural design of polyurethane composite electric poles

1. Summary of the advantages and disadvantages of concrete pole and polyurethane resin pole: 1, the advantages and disadvantages of concrete pole a, concrete is widely used as a pole because of its low price, good insulation performance and no maintenance. B, but the concrete is a brittle material, low tensile strength, so that the bending resistance, seismic resistance and impact resistance of the pole is poor, in the effect of typhoon, it is easy to damage, causing economic losses and personnel injury, but also cause power supply interruption and power maintenance difficulties. C, the concrete structure is heavy and inconvenient to transport and install.(FRP centrifugal fan)
A, The molecular structure of polyurethane (PU) contains the carbamate group, -NH-COO-), has good mechanical properties (lightweight, high strength and high modulus, large fracture elongation, impact resistance), excellent resistance to acid and alkali, ultraviolet light and atmospheric aging performance; convenient molding, environmental protection (no styrene volatilization). B. Excellent performance of fiber wound polyurethane composite poles: light quality, easy to transport, transport and install; high bending strength, fracture elongation, resistance to typhoon bending stress; good insulation performance; good resistance to weather and sun.(What is FRP)
2. 1. Design characteristics of composite material products: integration of material structure design. A, performance design: fully consider the use purpose and use conditions of the final product, so that the design of composite material products and the same design requirements. B. Structure design: calculation of strength, stiffness and stability. According to the load and the use environment, the design to ensure the material safety, reliable and economical structure size. It is the repeated process of selecting different materials under the condition of mechanical calculation and laying under various load combination. C, process design: the structure should be as convenient to form as possible.(FRP centrifugal fan) these three are interrelated, can not be completely separated. Structural design includes all the contents of material design, and it is the key to the reasonable design and cost reduction of composite material products.
A. Although the geometry of the pole is simple, like all the composite material structures, the material is anisotropic, which is highly desigable. B, the pole has a large taper: 1 / 75; the winding process is different from the equal straight rod, which makes the material parameters and geometric parameters of different sections in the structure design different. In fact, different process parameters lead to different mechanical properties of materials, but also lead to different mechanical behaviors of structures. C. The specification requires that the mechanical properties of composite material poles are relatively high, which can only be achieved by strict pavement design to meet the process conditions. D, The bearing capacity of composite material poles generally needs to be determined experimentally. How to carry out the structure design according to the needs of the bearing capacity, to achieve the active design and optimization design. This is the highest level of composite structure design.(FRP anti-corrosion fan)
3. Structural design of winding polyurethane composite pole A: Preparation: by design conditions: climatic conditions (such as temperature and humidity), load, length, etc., the standard load level, manufacturing process and raw materials. Take the 12m long, M class pole as an example, with polyurethane resin