体外预应力转向装置锚固性能研究
Anchorage Performance Study of the External Prestressing Steering Devices
钢内芯-超高性能混凝土(ultra-high performance concrete, UHPC)组合箱梁具有板件轻薄、质量轻、施工便捷等特点,工程应用中宜配套采用体外预应力体系。文中针对该组合箱梁,提出了一种体外预应力转向与锚固构造方案:在钢内芯预先开孔,将端部带钢榫的锚固钢腹板穿过开孔并嵌入UHPC,同时利用钢横隔板辅助受力。此外,对背景桥梁进行整体设计与计算,明确了体外预应力产生的转向分力。为研究有无钢横隔板时转向装置与主梁的锚固性能,设计了两组试件开展静力拔出试验研究。结果表明:两组试件均发生拔出破坏;增设钢横隔板可显著提升试件的极限承载力与抗拔刚度。针对文中提出的节点锚固构造方案,在背景工程设计转向力作用下,钢板与UHPC界面最大分离量不超过0.20 mm,结构无开裂与屈服风险,可满足桥梁正常使用极限状态下的受力要求。
The steel inner core-ultra-high performance concrete (UHPC) composite box girder is characterized by thin plates, lightweight, and convenient construction. For engineering applications, it is recommended to use the external prestressing system in combination. Therefore, based on the composite box girder, an external prestressing steering and anchorage design scheme was proposed. In the scheme, holes were pre-drilled in the steel core, allowing the anchored steel web with steel tenons at the ends to pass through the holes and embed into the UHPC. Then, the steel diaphragms were used to assist in load-bearing. The global calculations were conducted for the background engineering, clarifying the value of steering forces generated by the external prestressing. To investigate the anchorage performance at the connection between the steering device and main girder with or without steel diaphragm, two sets of static pull-out tests were designed. The results indicated that all specimens failed by pull-out. The addition of steel diaphragms can significantly improve the ultimate bearing capacity and pull-out stiffness. For the proposed scheme, under the action of the designed steering force, the maximum separation displacement at the interface between steel plate and UHPC does not exceed 0.20 mm. There is no risk of cracking or yielding in the structure, and it can meet the force requirements under the normal service limit states of the bridge.
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国家自然科学基金(52378236)
交通运输部重点科技项目(2022-MS5-124)
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