开孔钢箱-混凝土组合梁浇筑前后正截面受弯承载力研究  

The Study of Normal Section Flexural Capacity of Perforated Steel Box-concrete Composite Beams Before and After Concreting

作　　者：李帅科 甘文举[1] 张庆云 LI Shuaike;GAN Wenju;ZHANG Qingyun(School of Civil Engineering and Architecture,Hunan Institute of Science and Technology,Yueyang 414006,China)

机构地区：[1]湖南理工学院土木与建筑工程学院,湖南岳阳414006

出　　处：《湖南理工学院学报（自然科学版）》2024年第3期30-38,共9页Journal of Hunan Institute of Science and Technology(Natural Sciences)

基　　金：湖南省教育科学“十四五”规划教育财建研究专项重点资助项目(CJ210457)。

摘　　要：外包钢组合构件承载力高,但钢与混凝土容易滑移发生破坏.为有效防止钢与混凝土之间剥离,充分发挥材料强度,提出一种开孔钢箱-混凝土组合梁方案.首先研究开孔钢箱-混凝土组合梁浇筑前后的受弯性能,对共计四根试件进行四点弯曲试验,分析剪跨比对开孔钢箱-混凝土组合梁受弯承载力的影响,并建立ABAQUS模型进行有限元分析.研究结果表明:开孔钢箱梁受弯承载力与挠度均满足施工要求;随着剪跨比减小,受弯承载力增大;开孔钢箱-混凝土组合梁达到极限荷载时,界面未出现滑移,底部钢板屈服;所有试件均为受弯破坏,荷载-挠度曲线呈现弹性与弹塑性两个工作阶段,具有较好延性;ABAQUS有限元模型与实验数据吻合较好,可为试件在实际工程中的应用提供参考.Steel-encased composite members exhibit significant bearing capacity,however,slip failure between steel and concrete remains a critical concern.To effectively mitigate this issue and fully exploit the material strengths,this paper proposes a novel perforated steel box-concrete composite beam.Firstly,we investigate the bending performance of the box girder both before and after concreting,utilizing four-point bending tests on a total of four specimens.We subsequently analyze the effect of the shear span ratio on the bending capacity of the composite box girder.An ABAQUS model was developed for finite element analysis and validated against the experimental findings.The results indicate that both the bending capacity and deflection of the perforated steel box-concrete composite beam satisfy construction requirements.It was observed that a decrease in the shear span ratio leads to an increase in bending capacity.Upon reaching the ultimate load,no slippage was recorded at the interface;the bottom steel plate yielded,and all specimens failed due to bending.Load-deflection data displayed a two-stage response characterized by elastic and plastic behavior,demonstrating good ductility.Moreover,the ABAQUS finite element model correlated well with experimental data,offering valuable insights for the practical application of the specimens in engineering projects.

关 键 词：开孔钢箱-混凝土组合梁 受弯承载力 有限元模拟 

分 类 号：TU398[建筑科学—结构工程]