铆接钢桁梁论文：铆接连续钢桁梁承载能力及病害整治研究_36601.doc

铆接钢桁梁论文：铆接连续钢桁梁承载能力及病害整治研究 【中文摘要】采用桥梁的常规试验,对某桥外观检查、静载实验和动载实验,然后与桥梁的理论计算得到结构静载位移、应力、结构自振特性等进行比较,对该桥的运营状态有明确的认识。主要研究内容及成果包括：(1)对某铆接连续钢桁梁桥进行了外观检查、上拱度检查、线桥偏心检查、结构布置检查、钢梁裂纹和锈蚀及铆钉检查、支座检查以及墩台检查,通过midas等有限元软件对桥梁进行理论分析。对本桥进行静载实验和动载实验,然后与桥梁的理论计算得到结构静载位移、应力、结构自振特性等进行比较,评估该桥的运营状态。(2)理论和计算表明,某桥的整体承载能力、竖向刚度、横向刚度满足规范要求,抗洪能力满足规范要求。采用40Hz滤波,钢梁横向加速度不满足要求；采用25Hz滤波,钢梁横向加速度不满足要求。1#墩顶横向振幅不满足《桥检规》通常值要求,下平纵联以及纵梁间水平及横向联接系杆件病害较严重,铆钉烂头多,涂装脱落面积大,部分纵梁横联下横撑角钢水平肢锈蚀殆尽。中跨跨中伸缩纵梁处铰板拉断,纵梁活动端上下跳动明显。1#和2#桥墩裂缝宽度超过《桥检规》限值。(3)对铆接连续钢桁梁的病害原因进行了分析。某桥工作环境恶劣和失修导致涂装失效、铆钉严重锈蚀失效、杆件锈断。板铰的钢板厚度薄,导致断裂。(4)建议病害整治方案为：钢梁全面油漆,钢桥主体采用《铁路钢桥保护涂装》TB/T1527-2004的第6体系进行涂装。更换中跨跨中伸缩纵梁处铰板。更换部分下平纵联的斜杆和纵梁横联的下横撑杆。将失效铆钉更换为高强度螺栓。 【英文摘要】Routine use of the bridge test, visual inspection of a bridge, static load test and dynamic load test, and then calculated with the theoretical structure of the bridge static displacement, stress and vibration characteristics were compared, the operational state of the bridge has a clear understanding.Main contents and results, including:(1) Row of a riveted steel truss bridge for a visual inspection to check on the arch, cable bridge eccentric inspection, structural layout inspection, steel beams and rivets, cracks and corrosion checks, bearing checks and pier inspection, such as finite element software by midas Theoretical analysis of the bridge. Dead load of the bridge test and dynamic load test, and then calculated with the theoretical structure of the bridge static displacement, stress and vibration characteristics were compared to assess the operational status of the bridge(2) Theory and calculations show that the overall carrying capacity of the bridge, vertical stiffness, lateral stiffness to meet the regulatory requirements, flood control capacity to meet regulatory requirements. With 40Hz filter, beam lateral acceleration does not meet the requirements; with 25Hz filter, beam lateral acceleration does not meet the requirements. Pier 1, the lateral amplitude does not meet the “bridge inspection rul