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Post-tensioning glulam timber beams with basalt FRP tendons

机译:玄武岩FRP筋的后张胶合木梁

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摘要

Improvements in the structural performance of glulam timber beams by the inclusion of reinforcing materials can increase both the service performance and ultimate capacity. This paper describes a series of four-point bending tests conducted, under service loads and to failure, on unreinforced, reinforced and post-tensioned glulam timber beams, where the reinforcing tendon used is 12 mm dia. basalt fibre-reinforced polymer. The research is designed to evaluate the benefits offered by including an active reinforcement in contrast to the passive reinforcement typically used within timber strengthening works, in addition to establishing the effect that bonding the reinforcing tendon has on the material's performance. Further experimental tests have also been developed to investigate the long-term implications of this research, with emphasis placed upon creep and loss of post-tensioning; however, this is ongoing and is not presented in this paper. The laboratory investigations establish that the flexural strength and stiffness increase for both the unbonded and bonded post-tensioned timbers compared to the unreinforced and reinforced beams. Timber that is post-tensioned with an unbonded basalt fibre-reinforced polymer tendon shows a flexural strength increase of 2ṡ8% and an increase in stiffness of 8ṡ7%. Post-tensioned beams with a bonded basalt fibre-reinforced polymer tendon show increases in flexural strength and stiffness of 15ṡ4% and 11ṡ5% respectively.
机译:通过包含增强材料来改善胶合木梁的结构性能,可以提高使用性能和极限承载力。本文介绍了在未加筋,加筋和后张紧的胶合木梁上,在使用载荷和破坏作用下进行的一系列四点弯曲测试,其中使用的钢筋束直径为12 mm。玄武岩纤维增强聚合物。该研究旨在评估与通常在木材加固工作中使用的被动加固相比,包括主动加固所带来的好处,此外还可以确定粘合加固筋对材料性能的影响。还开发了进一步的实验测试来研究这项研究的长期意义,重点是蠕变和后张应力的损失。但是,这是正在进行的,因此不在本文中介绍。实验室研究表明,与未加固和加固梁相比,未粘结和粘结后张木材的抗弯强度和刚度均增加。用未粘合的玄武岩纤维增强聚合物腱后张的木材显示出抗弯强度增加了2ṡ8%,刚度增加了8ṡ7%。结合玄武岩纤维增强聚合物腱的后张梁的抗弯强度和刚度分别提高了15ṡ4%和11ṡ5%。

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