【摘要】 研究目的：新建铁路大量采用框架墩跨越运营铁路，传统框架墩施工周期长、支架和模板存在倾覆及落物风险，对运营铁路影响大，为了保障铁路运营安全，研究新型结构以降低施工干扰和安全风险。本文提出钢混组合立柱、整体式钢立柱和钢混混合立柱等新型框架墩及连接结构，并开展理论计算、有限元分析和试验验证，以掌握其力学性能，满足工程应用需求。研究结论：（1）新型框架墩立柱与基础间采用钢筋-栓钉-螺栓组合连接结构，连接结构中外侧连接钢筋-栓钉提供的抵抗弯矩最大，其次为连接螺栓，两者之和占总承载力的80%～85%;(2)通过精细化有限元数值分析，在正常运营状态计算荷载作用下，连接结构各部件处于弹性状态，满足受力要求；（3） 1∶4.5缩尺模型拟静力试验结果表明，新型框架墩破坏模式为墩身钢板鼓曲，连接结构与墩身协同受力性能良好，结构水平承载力由墩身强度控制；与理论计算值相比，试验开裂弯矩为正常运营状态最大弯矩的1.47倍，屈服弯矩为地震作用最大弯矩的1.27倍，连接结构具有良好的静力和抗震性能；（4）本研究结论可为铁路框架墩设计和施工提供参考和借鉴。更多还原

【Abstract】 Research purposes: A large number of newly-built railways use frame piers to cross the operational railways. Traditional frame piers have a long construction period, and there is a risk of overturning and falling objects in the brackets and templates, which has a significant impact on the operation of railways. In order to ensure the safety of railway operations, a new type of structure is studied to reduce construction interference and safety risks. This paper proposes new frame piers and connection structures such as steel-concrete composite columns, integral steel columns,steel-concrete hybrid columns, and conducts theoretical calculations, finite element analysis, and experimental verification to grasp their mechanical properties and meet engineering application requirements.Research conclusions:(1) The new frame pier column and foundation are connected by a combination of steel bars, studs, and bolts. The outer connecting steel bars and studs provide the highest resistance bending moment in the connection structure, followed by the connecting bolts. The sum of the two accounts for approximately 80%～85% of the total bearing capacity.(2) Through refined finite element numerical analysis, under normal operating conditions, the components of the connecting structure are in an elastic state and meet the stress requirements under the calculated load.(3) The results of the 1∶4.5 scaled model quasi-static test show that the failure mode of the new frame pier is the bulging of the pier body steel plate. The joint structure and pier body have good collaborative stress performance, and the horizontal bearing capacity of the structure is controlled by the strength of the pier body; Compared with the theoretical calculation values, the experimental cracking bending moment is 1.47 times the maximum bending moment under normal operating conditions, and the yield bending moment is 1.27 times the maximum bending moment under seismic action. The connecting structure has good static and seismic performance.(4) The reseach results can provide reference and inspiration for the design and construction of railway frame piers.更多还原