预应力碳纤维板强化改造重载铁路桥梁成套技术

发布时间：2018-03-27 19:16

本文选题：碳纤维板　切入点：锚具　出处：《中国铁道科学》2014年05期

【摘要】：为满足我国铁路桥梁加固和重载强化改造工程的需求,以30t以上轴重重载铁路改造技术科研项目为依托,开展预应力碳纤维板加固重载铁路桥梁技术的研究以及预应力碳纤维板组装件等产品的研制、加固体系设计、模型梁加固试验、原梁加固试验等,解决了碳纤维板材的夹持、张拉和锚固等技术难题,提出了加固设计的原则及指标、产品质量检验以及施工验收的技术要求,形成了预应力碳纤维板加固重载铁路桥梁的成套技术。研究结果表明:研制的采用波形夹片式锚具和楔形夹片式锚具的碳纤维板组装件具有优异的力学性能,其锚固效率(组装件强度与材料强度的比值)均大于0.95;在200MPa疲劳应力幅作用下,经历200万~400万次疲劳加载后,其锚固效率仍大于0.95;100和1 000h的应力松弛率分别为1.156%和1.600%。通过对6m模型梁和32m预应力混凝土梁加固试验,验证了预应力碳纤维板加固重载铁路桥梁成套技术的可行性和可靠性,加固效果满足重载铁路设计要求,并已成功应用于朔黄铁路桥重车线上20m简支梁的加固。
[Abstract]:In order to meet the needs of railway bridge reinforcement and heavy-haul retrofit engineering in China, the technical scientific research project of heavy-haul railway reconstruction with axle load of more than 30 tons is used as the basis. In order to solve the problem of carbon fiber sheet clamping, the research on the technology of prestressed carbon fiber sheet strengthening heavy duty railway bridge, the development of prestressed carbon fiber plate assembly, the design of strengthening system, the strengthening test of model beam, the strengthening test of original beam, etc., are carried out. Some technical problems, such as tensioning and anchoring, are put forward. The principles and indexes of reinforcement design, the technical requirements of product quality inspection and construction acceptance are put forward. A complete set of techniques for strengthening heavy-duty railway bridges with prestressed carbon fiber sheets has been formed. The results show that the developed carbon fiber sheet assemblies with corrugated clamped anchors and wedge-clamped anchors have excellent mechanical properties. The anchoring efficiency (the ratio of the strength of the assembly part to the strength of the material) is greater than 0.95.After the 200MPa fatigue stress amplitude, after 2 million ~ 4 million times of fatigue loading, The stress relaxation rates of the anchoring efficiency are 1.156% and 1.600 h, respectively. The feasibility and reliability of the complete set of prestressed carbon fiber reinforced concrete (CFRP) reinforced heavy haul railway bridges are verified by the reinforcement tests of 6m model beams and 32m prestressed concrete beams. The reinforcement effect meets the design requirements of heavy-haul railway and has been successfully applied to the reinforcement of 20m simply supported beam on the heavy railway line of Shuohuang railway bridge.
【作者单位】：神华集团有限责任公司;
【基金】：国家科技支撑计划项目(2013BAG20B00)
【分类号】：U445.72

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