建筑结构学报2024，Vol.45Issue(2)：95-106,12.DOI:10.14006/j.jzjgxb.2022.0378
预制装配部分包覆高强型钢-超高性能混凝土组合梁受弯承载力试验研究
Experimental study on flexural bearing capacity of precast and assembled partially encased HSS-UHPC composite beam
摘要
Abstract
In order to reduce the weight and construction cost of large span and heavy load structures,a type of steel-concrete composite beam was proposed,that is,precast and assembled partially encased high strength steel-ultra high performance concrete(HSS-UHPC)composite beam(PPECB).Seven specimens,including five PPECBs with castellated steel(PPECCBs)and two PPECBs with solid-web steel(PPESCBs),were designed for the static test to investigate their flexural behavior under positive bending moment,and the failure mode,strain development and flexural capacity were mainly analyzed.The influences of steel flange thickness,steel web form,stirrup form and laminated slab form on the flexural capacity of PPECB were revealed.The results show that the failure modes of PPECB include bonding failure of the laminated surface and typical bending failure.The specimens that failed in bending failure show better ductility and overall working performance.With the increase of steel flange thickness from 6 mm to 10 mm and 14 mm,the flexural capacity of PPECB increases by 23.6％and 25.8％,respectively.Compared with PPECCBs,the flexural capacity and stiffness of PPESCBs are significantly higher.The stirrup form has no obvious effect on the cracking resistance of PPESCB.However,the yield and peak flexural capacities of PPESCB with C-stirrups are higher than those of PPESCB with closed stirrups.The flexural capacity of PPECCB with keyways laminated slab is higher than that of PPECCB with reinforced trusses concrete laminated slab.Finally,the calculation formula of the flexural capacity of PPECB was given,and the calculation results are in good agreement with the experimental results.关键词
高强型钢-超高性能混凝土组合梁/部分包覆/预制装配/静力试验/受弯性能Key words
HSS-UHPC composite beam/partially encased/precast and assembled/static loading test/flexural performance分类
建筑与水利引用本文复制引用
郝宁,杨勇,薛亦聪,冯世强,于云龙,马慕达,曹燕妮..预制装配部分包覆高强型钢-超高性能混凝土组合梁受弯承载力试验研究[J].建筑结构学报,2024,45(2):95-106,12.基金项目
陕西省自然科学基础研究计划(2019JC-30),国家自然科学基金面上项目(51978565). （2019JC-30）
