榫卯钢结构外包U型钢-混凝土组合梁抗弯性能试验及理论分析
引用文献：
舒兴平 刘筱钰 贺冉 张再华. 榫卯钢结构外包U型钢-混凝土组合梁抗弯性能试验及理论分析[J]. 建筑结构，2022，48（08）：80-87.
SHU Xingping LIU Xiaoyu HE Ran ZHANG Zaihua. Experimental and theoretical analysis of flexural performance of U-shaped steel-concrete composite beams covered by tenon and mortise steel structure[J]. Building Structure，2022,48（08）：80-87.
摘要：为研究一种新型抗剪连接的榫卯钢结构外包U型钢-混凝土组合梁的抗弯性能以及破坏模式，对6根此种形式的简支梁足尺试件进行了抗弯承载力试验。试验中主要考虑翼缘板内钢筋桁架焊接用作抗剪连接件，研究钢梁高度、内部纵筋等对组合梁抗弯刚度和抗弯承载力的影响。在试验的基础上提出了适应此种新型抗剪连接件的组合梁跨中挠度计算公式。研究结果表明：此种抗剪连接件的组合梁试件承载力良好，破坏形态均为正截面弯曲破坏，破坏后整个试件具有很大的挠度变形，满足试件延性设计要求；提出的修正刚度法计算跨中挠度结果与试验值吻合较好。
关键词：装配式结构，榫卯钢结构，组合梁，抗剪连接件，钢筋桁架，抗弯刚度
基金：国家自然科学基金项目(51778219)。
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[8] 张婷.新型外包U型钢-混凝土组合简支梁的变形计算和分析[J].山东英才学院学报，2018,14(3):113-117.
[9] 聂建国，李红有，唐亮.高强钢-混凝土组合梁受弯性能试验研究[J].建筑结构学报，2009,30(2):67-72.
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[11] WANG Y C.Deflection of steel-concrete composite beams with partial shear interaction [J].Journal of Structural Engineering,ASCE,1998,124(10):1159-1165.
[12] 聂建国，王洪全，谭英.钢-高强混凝土组合梁的试验研究[J].建筑结构学报，2004,25(1):59-63.
[13] JOHNSON R P,BUCKBY R J.Composite structures of steel and concrete[M].London:Crosby Lockwood Staples,1975.
[14] 聂建国，沈聚敏，延滨，等.冷弯薄壁型钢-混凝土组合梁的试验研究及应用[J].建筑结构，1988,18(1):54-56.
[15] HYEONJONG HWANG,TAESUNG EOM,HONGGUN PARK.Cyclic loading test for beam-column connections of concrete filled U-shaped steel beams and concrete encased steel angle columns [J].Journal of Structure Engineering,2015,141(11):04015020.
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Experimental and theoretical analysis of flexural performance of U-shaped steel-concrete composite beams covered by tenon and mortise steel structure
Abstract: In order to study the flexural performance and failure mode of a new type of shear-connected U-shaped steel-concrete composite beams covered by tenon and mortise steel structure, the flexural bearing capacity test was carried out on 6 full-scale specimens of this type of simply supported beam. In the test, the welding of steel bar trusses in the flange plate was mainly considered as the shear connector, and the influence of the height of the steel beam and the internal longitudinal reinforcement on the flexural stiffness and flexural bearing capacity of the composite beam was studied. On the basis of the test, a formula for calculating the mid-span deflection of composite beams suitable for this new type of shear connector was proposed. The research results show that the composite beam specimen of this shear connector has good bearing capacity, and the failure modes are normal section bending failure. After failure, the entire specimen has a large deflection deformation, which meets the ductility design requirements of the specimen. The mid-span deflection calculated by the stiffness method is in good agreement with the experimental value.
Keywords: prefabricated structure; tenon and mortise steel structure; composite beam; shear connector; steel truss; bending stiffness
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