采用增强槽钢连接件的双钢板-混凝土组合梁受弯性能研究

为了解决常规双钢板-混凝土组合结构整体性不足的问题，提出了一种采用增强槽钢连接件的双钢板-混凝土组合结构。为研究该组合结构受弯性能，对6根采用增强槽钢剪力连接件的双钢板-混凝土组合梁开展四点弯曲试验。研究参数为核心混凝土种类(超高性能混凝土及普通混凝土)、剪跨比、钢板厚度及连接件间距。试验结果表明：合理控制距厚比和剪跨比，试件将呈现弯曲破坏形式，并展现出良好的延性，增加钢板厚度和核心混凝土强度，截面受弯承载力得到提升。提出了该双钢板-混凝土组合梁受弯承载力理论分析模型，与试验结果比较表明，该理论分析模型能较好计算该组合梁承载力。同时，基于ABAQUS软件建立采用增强槽钢连接件双钢板-混凝土组合梁精细化有限元分析模型，与试验结果验证表明，该分析模型能精确模拟组合梁受力性能，可为该种组合结构的设计与应用提供基础。

Study on flexural behavior of steel-concrete-steel sandwich composite beams with enhanced C-channels

In order to solve the problem of insufficient integrity of conventional steel-concrete-steel (SCS) sandwich composite structures, an SCS sandwich composite structure with enhanced C-channels (SCSCS-ECs) was developed. In order to study the flexural behavior of this composite structure, bending tests on six SCS sandwich composite beams with enhanced C-channels (SCSCB-ECs) were carried out. The investigated parameters were the type of core concrete (ultra-high performance concrete or normal concrete), shear span ratio, thickness of steel faceplate and spacing of ECs. The test results show that with the properly designed spacing of connectors and shear span ratio, the SCSCB-ECs fail in flexural mode and show good ductility. Increasing the thickness of steel faceplate and the strength of concrete improves the bending resistance of SCSCB-ECs. Theoretical models were developed to predict the ultimate load of SCSCB-ECs. The predictions by the developed theoretical models against the test results show the reasonable estimations. In addition, a finite element model for SCSCB-ECs was developed using general software ABAQUS. The finite element model is proved to be able to simulate the bending behavior of SCSCB-ECs,which provides foundation for the design and application of such composite structure.