摘要
针对钢-UHPC组合桥面板使用传统机械剪力连接件的不足,提出一种装配式钢-UHPC组合桥面板。为给该装配式组合桥面板的设计和应用提供依据,以国内某大跨度扁平钢箱梁桥为依托,将该桥钢桥面板改为装配式钢-UHPC组合桥面板进行试设计,并采用ANSYS建立主梁节段空间有限元模型,对试设计的装配式组合桥面板的受力性能进行研究。研究结果表明:装配式组合桥面板中,UHPC层的横桥向拉应力和粘结层的横桥向剪应力是结构计算的控制指标;在装配式组合桥面板结构中,UHPC层受到的最大拉应力为10.87 MPa,粘结层受到的最大剪应力为0.97 MPa,材料均能满足结构的受力要求;装配式组合桥面板的钢面板最不利构造细节的最大应力幅仅为纯钢桥面板的1/5,说明装配式组合桥面板结构可满足实际桥梁需求且可有效地避免纯钢桥面疲劳开裂等病害。
In view of the deficiency of the steel and ultra-high performance concrete （UHPC） composite bridge deck using the conventional mechanical shear connectors, a type of the assembled steel and UHPC composite deck was proposed. To provide the design and application of the pro-posed composite deck with the basis, a domestic long span flat steel box girder bridge was taken as a reference, the steel deck of the bridge was replaced with the proposed composite deck and the tri-al design of the composite deck was carried out. The ANSYS was used to create the spatial finite element model for the segment of the main girder of the bridge and the mechanical performance of the composite deck of the trial design was studied. The results of the study demonstrate that for the assembled steel and UHPC composite deck, the transverse tensile stress of the UHPC layer and the transverse shear stress of the binding layer are the control indices of the structural calcula-tion. In the composite deck, the maximum tensile stress subjected by the UHPC layer is 10. 87 MPa, the maximum shear stress subjected by the binding layer is 0. 97 MPa and the materials men-tioned herewith can all meet the mechanical requirements of the structure. The maximum stress range of the worst structural detail of the steel deck in the composite deck merely accounts for 1/5 of that of the pure steel deck, showing that the structure of the composite deck can accommodate the requirements of the practical bridges and can effectively avoid the deteriorations like the fatigue cracking of the steel deck.
出处
《桥梁建设》
EI
CSCD
北大核心
2018年第1期94-99,共6页
Bridge Construction
基金
国家自然科学基金项目(51478120
U1305245)~~
关键词
钢桥
钢-混组合桥面
装配式结构
超高性能混凝土
试设计
受力性能
有限元法
steel bridge
steel and concrete composite bridge deck
assembled structure
ultra-high performance concrete
trial design
mechanical performance, finite element method
