西班牙首座超高性能纤维混凝土人行桥的设计与施工

发布时间：2018-10-10 17:59

【摘要】：西班牙阿利坎特修建的一座全长43.5m的人行桥采用超高性能纤维混凝土(UHPFRC),是世界上第一座UHPFRC桁架人行桥。该人行桥采用变高度U形断面,由2片华伦式桁架组成,底部用X形撑杆连接,桥面板位于桁架中间高度处;结构计算表明,人行桥的结构安全性能满足承载能力和正常使用极限状态的要求,并验证了相关设计的合理性;通过对2%纤维含量的混凝土在潮湿和干燥状态力学特性的研究,研发出UHPFRC配合比。人行桥分5个阶段(2片桁架→上弦杆和纵向加劲肋→下弦杆、X形撑杆和支座处大体积混凝土墙→横肋→桥面板)施工。在预制工厂里进行的荷载试验结果表明,试验结果与有限元结果吻合较好,人行桥力学性能较好。相比钢结构方案,采用UHPFRC降低了人行桥的施工和维护成本,增加了耐久性,延长了使用寿命,同时使桥梁更美观。
[Abstract]:The super high performance fiber reinforced concrete (UHPFRC),) is the first UHPFRC truss footbridge in the world, which is built by Alicante, Spain, with a total length of 43.5 m. The footbridge adopts U-shaped section with variable height, which consists of two Warren trusses, the bottom of which is connected with X-shaped brace, the deck plate is located at the middle height of the truss, and the structural calculation shows that, The structural safety performance of footbridge meets the requirements of bearing capacity and limit state of normal use, and verifies the rationality of the related design. The mechanical properties of concrete with 2% fiber content in wet and dry state are studied. UHPFRC mix ratio was developed. The footbridge is divided into five stages (2 pieces of truss chords and longitudinal stiffened ribbed chords, X-shaped braces and large volume concrete walls with transverse ribs and deck slabs). The load test results in the prefabricated factory show that the experimental results are in good agreement with the finite element results and the mechanical properties of the footbridges are better. Compared with the steel structure scheme, UHPFRC reduces the construction and maintenance cost, increases the durability, prolongs the service life and makes the bridge more beautiful.
【作者单位】：江苏省交通科学研究院股份有限公司;
【分类号】：U448.11

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