大跨度自锚式悬索桥半封闭箱型加劲梁抗风性能试验研究  

Experimental Study on Wind Resistance Performance of Semi-closed Box Girder of Long-span Self-anchored Suspension Bridge

作　　者：陈逸群 CHEN Yiqun(Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,Shanghai 200092,China)

机构地区：[1]上海市政工程设计研究总院(集团)有限公司,上海200092

出　　处：《工程技术研究》2024年第6期1-4,共4页Engineering and Technological Research

摘　　要：文章以一拟建大跨度自锚式悬索桥为工程背景,通过ANSYS有限元分析和节段模型风洞试验,研究了半封闭箱型钢-UHPC组合加劲梁的抗风性能。研究结果表明,半封闭箱型钢-UHPC组合加劲梁在-3°、0°及3°风攻角下,颤振临界风速均大幅高于颤振检验风速,颤振稳定性满足规范要求,且安全储备较大。加劲梁在5°、3°和-3°风攻角下发生了超过规范允许幅值的竖向涡激共振,在3°风攻角下发生了超过规范允许幅值的扭转涡激共振。对原加劲梁进行气动外形改良后,竖向涡激共振和扭转涡激共振均消失,同时颤振稳定性也明显改善。Based on a proposed long-span self-anchored suspension bridge,the wind-resistant performance of semienclosed steel-UHPC composite stiffening girder is studied by ANSYS finite element analysis and wind tunnel test of segmental model.The results show that the flutter critical wind speed of the semi-closed box steel-UHPC composite stiffening girder is significantly higher than the flutter test wind speed at-3°,0°and 3°wind attack angles.The flutter stability meets the requirements of the specification and the safety reserve is large.The vertical vortexinduced resonance of the stiffening girder exceeds the allowable amplitude of the specification at the wind attack angles of 5°,3°and-3°,and the torsional vortexinduced resonance exceeds the allowable amplitude of the specification at the wind attack angle of 3°.After the aerodynamic shape improvement of the original stiffening beam,the vertical vortex-induced resonance and the torsional vortex-induced resonance disappear,and the flutter stability is also significantly improved.

关 键 词：自锚式悬索桥 钢-UHPC组合梁 节段模型试验 加劲梁 抗风性能 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]