首页|钢箱梁桁架式纵隔板疲劳开裂弹性阻尼支撑处治技术

钢箱梁桁架式纵隔板疲劳开裂弹性阻尼支撑处治技术

Application of Elastic-Damping Support Device to Treat Fatigue Cracking of Truss-Type Longitudinal Diaphragms in Steel Box Girder

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针对钢箱梁桁架式纵隔板中出现的早发性、多发性、再发性疲劳开裂病害,分析桁架式纵隔板病害原因,基于能量法,提出将端部刚接斜腹杆变为端部铰接的弹性阻尼支撑处治技术.研制弹性阻尼支撑装置(Elastic-Damping Support Device,EDSD),将斜腹杆局部切除并安装EDSD,通过EDSD中设置的弹性阻尼单元耗散外部荷载输入结构的大部分能量,保障结构在长期车辆荷载等作用下的安全性和正常使用性能.结合某斜拉桥钢箱梁桁架式纵隔板疲劳开裂处治需求,开展了该处治技术实桥应用,并对其进行有限元分析及实桥监测.结果表明:钢箱梁内斜腹杆局部改造安装EDSD后可大幅降低斜腹杆应力水平,有效降低斜腹杆疲劳易损部位开裂风险,增加疲劳寿命;安装EDSD的斜腹杆上的既有裂缝均无扩展.
The causes of early,multiple,and recurrent fatigue cracks in the truss-type longitudinal diaphragms in the steel box girder are analyzed,and based on the energy method,it is proposed to replace the original end rigid connections of diagonals to the hinged elastic-damping support devices(EDSDs).A portion of the original diagonals is cut off and replaced by the EDSD,utilizing the elastic damping units in the EDSD to dissipate most of the energy of external loads imposed on the structure,to ensure the service safety of the structure under long-term vehicle loads.The proposed method has been used in an existing cable-stayed bridge.The finite element analysis and field measurements indicate that after fitted with EDSDs,the stresses in the diagonals are greatly reduced,effectively mitigating the cracking risks of the fatigue vulnerable locations in the diagonals,thus extending the fatigue life of the structure.The existing cracks in the diagonals with EDSDs do not show sign of further propagation.

cable-stayed bridgesteel box girdertruss-type longitudinal diaphragmdiagonalfatigue crackingelastic-damping support devicetreating techniqueengineering application

桑毅彩、朱世峰、吴海军、暨仕瑀、邓扬

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中交特种工程有限公司,湖北武汉 430071

重庆交通大学土木工程学院,重庆 400074

北京建筑大学土木与交通工程学院,北京 102616

斜拉桥 钢箱梁 桁架式纵隔板 斜腹杆 疲劳开裂 弹性阻尼支撑装置 处治技术 工程应用

国家自然科学基金河北省省级科技计划中交集团青年创新项目

51878027225676104H2021-ZJKJ-QNCX08

2024

10.20052/j.issn.1671-7767.2024.03.018

世界桥梁
中铁大桥局集团有限公司

世界桥梁

CSTPCD北大核心
影响因子：0.928
ISSN：1671-7767
年,卷(期)：2024.52(3)
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