Abstract：Research purposes: A straddle monorail project is the first project using the continuous beam turned from simply supported beam in China. The post-pouring area is the combined cross-section form of "concrete beam with overlying steel plate", and its longitudinal rebars are connected by a kind of "auxiliary short rebar" whose binding length is lower than that required by the specification. The structure above is obviously different from the conventional structure. To clarify the mechanical behavior of this area, the numerical simulations of various related FEM theories were carried out under different parameters. Its bearing capacity and crack resistance were emphatically studied, and reasonable analysis methods were given. Research conclusions: (1) Comparing to the dispersive crack and fracture mechanics model, the discrete crack model is the most reasonable method. (2) Comparing to the model using the rebar-concrete solid element or the simple truss element, the model with implantable interface element is the most reasonable method. (3) The rebar stress decreases with the increase of diameter, but its stress safety factor increases first and then decreases, hence a larger diameter is not necessarily better. (4) The modeling method and crack formula proposed in this paper can guide the design of this kind of structure and reduce the workload of FEM analysis.
樊健生,聂建国,张彦玲. 钢-混凝土组合梁抗裂性能的试验研究[J]. 土木工程学报, 2011(2):1-7.Fan Jiansheng, Nie Jianguo, Zhang Yanling. Experimental Study of Crack Resistance of Steel-concrete Composite Beams[J]. China Civil Engineering Journal, 2011(2):1-7.
[2]
蒋梅玲, 金贤玉, 田野, 等. 基于断裂力学和损伤理论的混凝土开裂模型[J]. 浙江大学学报:工学版, 2011(5):948-953.Jiang Meiling, Jin Xianyu, Tian Ye, etc. New Concrete Cracking Model Established Based on Fracture Mechanics and Damage Theory[J]. Journal of Zhejiang University:Engineering Science, 2011(5):948-953.
[3]
周帅,聂建国,方聪,等. 群钉连接装配式组合轨道梁受力特性研究[J]. 中国铁道科学, 2021(2):59-65.Zhou Shuai, Nie Jianguo, Fang Cong, etc. Investigation of Mechanical Characteristics for Assembled Composite Track Beam Connected by Group Studs[J]. China Railway Science, 2021(2):59-65.
[4]
曾永平,陈克坚,庞林,等. 近断层高速铁路典型桥梁抗震优化设计研究[J]. 铁道工程学报, 2020(8):51-58.Zeng Yongping, Chen Kejian, Pang Lin, etc. Optimization Design of Typical High-speed Railway Bridge in Near-fault Seismic Zone[J]. Journal of Railway Engineering Society, 2020(8):51-58.
[5]
赵明, 苏三庆, 周希茂, 等. 钢筋混凝土粘结滑移相关问题[J]. 施工技术, 2009(S1):5-9.Zhao Ming, Su Sanqing, Zhou Ximao, etc. Discussion on Bond-slip Behavior of Reinforced Concrete[J]. Construction Technology, 2009(S1):5-9.
[6]
陈克坚,谢海清,何庭国,等. 复杂艰险山区高速铁路桥梁设计技术[J]. 高速铁路技术, 2020(2):112-117.Chen Kejian, Xie Haiqing, He Tingguo, etc. Design Technology for High-speed Railway Bridge in Complex and Dangerous Mountainous Area[J]. High Speed Railway Technology, 2020(2):112-117.
2022, Vol. 39 
版权所有 © 2014 《铁道工程学报》编辑部