超大类矩形复合管节使用阶段受力状态研究

Research on Stress State of Ultra-large Rectangular Composite Pipe Segment in Service Stage

摘要:

钢混凝土复合管节在超大断面类矩形顶管工程中越来越多地得以推广应用。因受钢混凝土界面性能的影响，复合管节受力状态复杂，因此对于钢混凝土复合管节在使用阶段的受力性能进行分析具有非常重要的意义。结合上海市轨道交通某车站工程顶管法施工项目，采用有限元软件模拟分析复合管节在使用阶段受载状态下的受力性能。通过完全连接模型和栓钉连接模型这2种不同计算模型的对比，对复合管节应力、变形和界面滑移等方面进行分析。分析结果表明：采用栓钉连接模型更符合实际情况，钢结构及栓钉的最大应力出现在腰部，混凝土部分最大应力出现在顶部，管节变形主要为竖向变形，钢结构与混凝土结构界面存在局部滑移，采用横纵向肋板设计、界面设置栓钉等措施，可有效增强界面连接性能。

Abstract:

Steel-concrete composite pipe segments are increasingly being promoted and applied in super-large section rectangular pipe jacking projects. Influenced by the steel-concrete interfacial properties, the stress state of composite pipe segments is complex. Therefore, it is of great significance to analyze the stress performance of steel-concrete composite pipe segments during the service stage. Based on a pipe-jacking constructed metro station project in Shanghai, the finite element software is used to simulate and analyze the stress performance of composite pipe segments under load condition during the service stage. By analyzing and comparing two different calculation models such as full connection and stud connection, the stress, deformation and interface slip of the composite pipe segments are analyzed. The analysis results show that the use of stud connection model is more in line with the actual situation. The maximum stress of the steel structure and the studs occurs at the waist, and the maximum stress of the concrete part occurs at the top. The main deformation of the pipe segment is vertical. There is local slippage at the interface between steel structures and concrete structures. The taken measures such as designing transverse and longitudinal rib plates and setting stud bolts at the interface can effectively enhance the interface connection performance.