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Deflection determination method for BFRP prestressed concrete beams under fatigue loading

机译：疲劳荷载下BFRP预应力混凝土梁挠度确定方法

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摘要

This paper presents a study on concrete beams prestressed with basalt fiber reinforced polymer (BFRP) tendons subjected to dynamic loading. Usually, structures such as bridge decks, parking garages, offshore structures, are forced to withstand not only static load induced deformations, but also deformations caused by dynamic loading. In this study cyclic creep of concrete phenomena is reviewed. Literature survey on latest models or cyclic creep evaluation techniques such as Balaguru, Bazant and Hubler, Jiang et al., is provided. Based on twelve experimentally tested PC beam results, presented in previous paper (Atutis et al., 2018), a modified cyclic creep of concrete model (CCRM) adopted from Jiang et al. (2017) is presented. Extension to previous experimental tests on basalt fiber reinforcement, performed by the author, is given in the form of equation, evaluating the decrease of elasticity modulus of BFRP reinforcement during cyclic loading. Neveretheless, cyclic load is evaluated thru structural dynamics point of view, using singe-degree-of-freedom system and CCRM. Solution of equation of motion for a four-point loading scheme is being discussed and presented. This study serves validation analysis of proposed model together with proposals for future model developments.
机译：本文对玄武岩纤维增强聚合物（BFRP）筋预应力混凝土梁进行了动态载荷研究。通常，诸如桥面甲板，停车场，海上结构之类的结构不仅被迫承受静载荷引起的变形，而且还要承受由动态载荷引起的变形。在这项研究中，对混凝土现象的循环蠕变进行了综述。提供了有关最新模型或循环蠕变评估技术（如Balaguru，Bazant和Hubler，Jiang等）的文献调查。根据先前论文（Atutis等人，2018）中提出的十二个经过实验测试的PC光束结果，采用了Jiang等人的修改后混凝土循环蠕变模型（CCRM）。介绍（2017）。作者以公式的形式扩展了作者先前对玄武岩纤维增强材料进行的实验测试，评估了循环加载过程中BFRP增强材料的弹性模量的降低。但是，使用单自由度系统和CCRM可以从结构动力学的角度评估循环载荷。讨论并提出了四点加载方案的运动方程解。这项研究将对建议的模型进行验证分析，并为将来的模型开发提供建议。

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