板桁组合结构钢-混结合段的受力性能

Mechanical Property of Steel-concrete Joint Section of Plate-truss Composite Structure

为研究某公路、铁路两用斜拉桥公路桥面钢-混结合段的受力性能,对其进行了非线性有限元分析。同时依据相似性原则设计了钢-混结合段的大比例试验模型,测试了荷载作用下试验模型的控制断面和主要构件的应变和位移。理论分析与试验测试结果表明:钢-混结合段中钢结构、混凝土结构及栓钉的应力水平较低,具有较强的安全储备;钢与混凝土之间相对滑移量较小,钢结构荷载比较顺畅地传递到混凝土结构,钢-混结合段的工作性能良好,构造设计合理。本文的研究结果可供板桁组合结构钢-混结合段的设计参考。

To get the mechanical property of steel-concrete joint section of a highway-railway cable stayed bridge deck, the nonlinear finite element analysis is performed, and a large-scale test model of steel-concrete joint section is designed based on the similarity principle. The strain and displacement of the control section and main components of the test model under loading are tested. The theoretical analysis and test result show that （1） the steel structures, concrete structures and studs of the steel-concrete composite joint have low stress levels and a strong safety reserve; （2） the relative slippage between steel and concrete is small, and the steel structure load is smoothly passed to the concrete structure. The steel-concrete composite joint has excellent work performance and reasonable structural design. The result could be a reference for design of the subject structures.