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Chapter One APPLICATIONS Commercial Ladders The Fiber Technology Corporation is an example of a company that has adapted an aluminum ladder design for a customer to produce a nonconductive FRP replacement. The intricate angles and flares incorporated into the aluminum design precluded the use of a pultrusion process. Additionally, the design incorporated unique hinges to give the ladder added versatility. All these features were maintained while the objective of producing a lighter, nonconductive alternative was achieved. Major ladder manufacturers, such as R.D. Werner and Lynn Manufacturing also produce step and extension type ladders using rails made from pultruded glass/polyester structural sections. Indeed, ANSI has developed standard A 14.5-1982 for ladders of portable reinforced plastics. Figure 1-47 Table 1-10 lists the minimum mechanical properties with Composite Rails [ANSI required for compliance with the ANSI standard. standard A14.5-1982] Table 1-10 Minimum Composite Properties of Ladder Rail Sections [American National Standards Institute standard A14.5-1982] Stepladder Material Property Flange Web Web Web Lengthwise Lengthwise Cross Wet 150 F Weather Tensile Strength, psi 45,000 30,000 - 23,000 21,000 23,000 Tensile Modulus, 106 psi 2.8 2.0 - 1.5 1.4 1.5 Compressive Strength, psi 40,000 28,000 10,000 21,000 19,000 22,000 Compressive Modulus, 106 psi 2.8 2.0 - 1.5 1.4 1.6 Flexural Strength, psi 38,000 35,000 5,000 26,000 26,000 28,000 Flexural Modulus, 106 psi 2.0 1.8 0.70 1.4 1.4 1.4 Ultimate Bearing Strength, psi - 30,000 - - - - Izod Impact, ft-lb/inch - 20 - - - - Aerial Towers In 1959, the Plastic Composites Corporation introduced an aerial man-lift device used by electrical and telephone industries. The bucket, upper boom and lower boom insulator are all fabricated of fiberglass. The towers, known today as cherry pickers, are currently certified to 69 kVA in accordance with ANSI standards and are periodically verified for structural integrity using acoustic emission techniques. 55PDF Image | Marine Componsites
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