摘要
为了降低大跨度和重载结构的质量及工程造价,提出一种差异化使用超高性能混凝土(UHPC)和普通混凝土并结合使用高强型钢的钢-混凝土组合梁,即预制装配部分包覆高强型钢-超高性能混凝土组合梁(PPECB)。设计5根配置蜂窝型钢的预制装配部分包覆高强型钢-超高性能混凝土组合梁(PPECCB)和2根配置实腹型钢预制装配部分包覆高强型钢-超高性能混凝土组合梁(PPESCB),并进行受弯性能静力试验,对其破坏模式、应变发展和受弯承载力进行分析,研究高强型钢翼缘厚度、高强型钢腹板形式、箍筋形式、混凝土翼缘叠合板形式对其受弯承载力的影响。研究结果表明:PPECB破坏模式包括叠合面的黏结破坏和典型的弯曲破坏,发生弯曲破坏的组合梁表现出更良好的延性和整体工作性能;当高强型钢翼缘厚度从6 mm增加到10 mm和14 mm时,PPECB的受弯承载力分别提高23.6%和25.8%;相较于PPECCB,PPESCB的受弯承载力和刚度均有显著提高;配箍形式对PPESCB开裂荷载无明显影响,但采用C形箍筋的PPESCB,其屈服荷载和峰值荷载均高于闭合箍筋PPESCB的;带键槽叠合板PPECCB的受弯承载力优于钢筋桁架叠合板PPECCB的。提出了PPECB的受弯承载力计算式,其计算结果与试验结果吻合良好。
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.
作者
郝宁
杨勇
薛亦聪
冯世强
于云龙
马慕达
曹燕妮
HAO Ning;YANG Yong;XUE Yicong;FENG Shiqiang;YU Yunlong;MA Muda;CAO Yanni(School of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance of the Ministry of Education,Xi’an University ofArchitecture&Technology,Xi’an 710055,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2024年第2期95-106,共12页
Journal of Building Structures
基金
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)。
