Download Design Guide for FRP Composite Connections by Ayman S., Ph.D. Mosallam PDF
By Ayman S., Ph.D. Mosallam
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Additional info for Design Guide for FRP Composite Connections
18 in. 5 depending on the percent moisture absorbed by a coupon [1 in. × 1/4 in. × 18 in. 0 for components under cover Cc = environmental factor varies with the FRP material’s exposure to chemicals, temperature levels, and sustained stress levels. Ca = physical aging factor varies with number of years of service of FRP component, type of resin and fiber, and the manufacturing method, including curing type Cst = sustained factor. It should be noted that the use of fire-retardant resins may lead to reduction in mechanical properties and durability reductions.
If the edge distance is increased until it is equal to the bolt pitch, an appreciable increase in both bearing and tensile strengths is expected, but not the resistance to shear-out failures. Thus, in designing bolted pultruded joints, the engineer should not rely only on increasing the e/d ratio to enhance shear-out resistance. , pitch or back pitch), is specified to preclude premature failures due to tensile stresses and to enable each bolt to develop its full strength. As with minimum edge distance criteria, minimum pitch distances are expressed as a function of bolt diameters and are best determined by testing.
2. , w/d ≥ 6), the likelihood of fatigue failure at the bolted joint increases rapidly. The washer size and thickness have a great impact on the fatigue life of bolted joints. The clamping pressure distribution that gradually diminishes from a high value directly under the bolt head to the outside edge of the washer appears to be advantageous. It should be noted that the above conclusions are based on investigating a specific type of composite, and it is expected that these conclusions may be changed for pultruded composite bolted joints.