摘要
为提升钢-混组合连续桥结构主梁墩顶负弯矩区混凝土桥面板抗裂性能,基于北京市延庆奥林匹克园区三号桥,采用多尺度有限元模型,对该桥主梁与Y墩结合处构造设计进行了精确建模计算分析,通过有限元模型计算结果与实际监测应力值相比较分析综合表明,在组合梁负弯矩区采用普通混凝土+8cm厚超高性能混凝土(UHPC)组合桥面板形式,能够提高墩顶主梁负弯矩区混凝土的桥面板抗裂性能,并对普通混凝土+UHPC组合桥面板构造设计及施工要点进行了详细阐述,可为类似桥梁的设计以及计算分析方法提供借鉴。
To improve the crack resistance of concrete bridge decks in the negative moment zone of pier top of steel-concrete composite continuous girder bridges,this paper investigated Yanqing Olympic Park No.3 Bridge in Beijing.A refined multi-scale finite element model(FEM)was developed to accurately simulate the structural configuration at the interface between the main girder and Y-shaped pier.Through the comparison be-tween the finite element analysis results and the monitored stress value,it is comprehensively shown that using the composite deck form of"ordinary concrete topped with an 8cm layer of ultra-high performance concrete(UHPC)"can effectively enhance the crack resistance of the concrete deck in the negative moment zone above the pier of the composite girder.The paper also presented a detailed explanation of the structural design and key construction considerations for the ordinary concrete-UHPC composite deck system,providing valuable reference for the design and analytical modeling of similar bridge structures.
作者
欧阳嵩
李娟
Ouyang Song;Li Juan(Beijing General Municipal Engineering Design&Research Institute Co.,Ltd.,100082,China;China Academy of Transportation Science,Beijing 100029,China)
出处
《特种结构》
2025年第6期63-68,共6页
Special Structures
关键词
钢-混组合梁桥
多尺度有限元模型
超高性能混凝土(UHPC)
负弯矩区
抗裂性能
Steel-concrete composite girder bridge
Multi-scale finite element model
Ultra-high performance concrete(UHPC)
Negative moment zone
Crack resistance
