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This paper testimonials the current study standing on the high-temperature resistance of CFRP cable anchorages. For starters, the high-temperature resistance of bonding epoxy resin and CFRP composites is summarized.
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It should be noted the tensile toughness and modulus at place temperature also exhibit substantial discreteness resulting from these types of defects [fifty seven,fifty eight]. Moreover, the final tensile toughness and modulus degradation ratios soon after comprehensive decomposition on the resin matrix are also not fully dependable while in the experiences by different reports. Theoretically, the ultimate energy retention ratio is dominated by probabilistic fiber defects as well as CFRP composite producing defects, such as fiber wrinkles, and the ultimate modulus retention ratio is mainly dominated by production defects, for instance fiber wrinkles [55,56].
Next, the temperature field calculation procedures along with the high-temperature resistance Evaluation methods for CFRP cable anchorage systems are summarized. Some conclusions can be drawn, as follows:
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Thermocouples are primarily Employed in experimental measurement on the temperature field, but They are really restricted for getting the temperature industry inside substantial-dimension parts a result of the constraints of thermocouple arrangement density and location correcting. Using thermocouple measurement, Wang et al. [sixty eight] verified considerable temperature difference between the surface and inside Heart of a metal cable anchorage. additional, Zhu et al. [sixty six] obtained the temperature field of the steel cable anchorage from the fire subject by setting up multiple thermocouples, as revealed in Figure six, in which the pink details depict the thermocouples fixed over the steel wires inside the anchorage. the final results indicated considerably different temperatures at different destinations Within the anchorage. Also, it should be famous that only component of those thermocouples efficiently gave helpful temperature measurement details, and many thermocouples failed through the specimen preparation and tests approach, and that is to mention that thermocouple measurement was somewhat technically confined in exercise.
Also, new temperature measurement systems like optical fiber sensing is usually utilized, serving because the experimental validation of the FEA temperature area calculation.
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Existing study has confirmed that the transverse compressive toughness from the unidirectional CFRP composites is nearly 10% with the longitudinal tensile toughness at place temperature [fifty nine]. contemplating the allowable clamping force around the CFRP composites in the mechanical or composite bonding–mechanical anchorages, this concern may well limit the anchorage efficiency, especially at elevated temperatures if the transverse compression Attributes substantially degrade [12]. Similarly, present high-temperature failure from the chilly-Forged socketing anchorage for metal cables has also validated which the softening of epoxy resin is fatal, primary the cable system to pull out through the anchorage machine.
consequently, clarifying the mechanical performance degradation law of bonding components and CFRP composites at elevated temperatures is essential for the high-temperature resistance of anchorage systems.