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Load Testing of GFRP Composite U-Shape Footbridge

机译：GFRP复合U形行人桥的负载测试

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The paper presents the scope of load tests carried out on an innovative shell composite footbridge. The tested footbridge was manufactured in one production cycle and has no components made from materials other than GFRP laminates and PET foam. The load tests, performed on a 14-m long structure, were the final stage of a research program in the Fobridge project carried out in cooperation with: Gdansk University of Technology (leader), Military University of Technology in Warsaw, and ROMA Co. Ltd.; and co-financed by NCBR. The aim of the tests was to confirm whether the complex U-shape sandwich structure behaves correctly. The design and technological processes involved in constructing this innovative footbridge required the solving of many problems: absence of standards for design of composite footbridges, lack of standardized material data, lack of guidelines for calculation and evaluation of material strength, and no guidelines for infusion of large, thick sandwich elements. Obtaining answers during the design process demanded extensive experimental tests, development of material models, validation of models, updating parameters and extensive numerical parametric studies. The technological aspects of infusion were tested in numerous trials involving the selection of material parameters and control of the infusion parameters. All scientific validation tests were successfully completed and market assessment showed that the proposed product has potential applications; it can be used for overcoming obstacles in rural areas and cities, as well as in regions affected by natural disasters. Load testing included static and dynamic tests. During the former, the span was examined at 117 independent measurement points. The footbridge was loaded with concrete slabs in different configurations. Their total weight ranged from 140 kN up to 202 kN. The applied load at the most heavily loaded structural points caused an effect from 89% to 120%, compared to the load specified by standards (5 kN/m~2). Dynamic tests included standard actions (walking, running, synchronous jumps) as well as aggressive tests, all designed to confirm the usability of the footbridge. The performed trials allowed the identification of the modal and damping parameters of the structure. The designated first natural frequency with a value of 7.8 Hz confirmed the correctness of the U-shape cross-section design due to its significant structural rigidity.
机译：本文介绍了在创新壳牌复合人行桥上进行的负载测试的范围。经过测试的行人桥在一个生产循环中制造，没有由GFRP层压板和PET泡沫以外的材料制成的部件。以14米长的结构执行的负载测试是与：华沙工业大学（Warma）和Roma Co.和Roma Co.和Roma Co.和Roma Co.和Roma Co. Ltd .;并由NCBR共同资助。测试的目的是确认复杂的U形夹心结构是否正确行为。构建这种创新行为桥的设计和技术过程需要解决许多问题：缺乏综合足桥设计的标准，缺乏标准化材料数据，缺乏计算和评估材料强度的准则，并没有注入指导原则大，厚三明治元素。在设计过程中获取答案需要大量的实验测试，材料模型的开发，验证模型，更新参数和广泛的数值参数研究。在涉及选择材料参数和输液参数的控制的许多试验中测试了输注的技术方面。所有科学验证测试都成功完成，市场评估表明，拟议产品具有潜在的应用;它可用于克服农村地区和城市的障碍，以及受自然灾害影响的地区。负载测试包括静态和动态测试。在前者期间，在117个独立的测量点检查跨度。行人桥用不同的配置装有混凝土板。它们的总重量从140 kn到202 kn。与标准规定的负荷相比，最重载的结构点的施加负荷导致89％至120％的效果（5KN / M〜2）。动态测试包括标准操作（行走，运行，同步跳转）以及攻击性测试，旨在确认人行桥的可用性。执行的试验允许识别结构的模态和阻尼参数。由于其显着的结构刚性，指定的第一自然频率具有7.8Hz的值为7.8 Hz的正确性。

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