三面包柱梁式钢筋混凝土柱托换节点受力性能研究Study-山东农业大学.PDFVIP

山东农业大学学报 自然科学版( ),2017,48(2):178-185 VOL.48NO.22017 Journal of ShandongAgriculturalUniversity (Natural ScienceEdition ) doi:10.3969/j.issn.1000-2324.2017.02.004 三面包柱梁式钢筋混凝土柱托换节点受力性能研究 1* 1 2 余 潇 吴二军 王 婷, , 1. 河海大学 土木与交通学院, 江苏 南京 210098 2. 河海大学 港口海岸与近海工程学院, 江苏 南京 210098 摘 要: 结构托换工程中，常遇到混凝土柱一侧施工空间狭小情况，常规的四面包柱梁式柱托换方法不适用。本文结 合工程实例，介绍了一种三面包柱梁式钢筋混凝土柱托换节点，通过有限元计算对其进行受力分析，验证了设计的 可靠性，并通过试验考察其破坏形态、受力机理以及预应力大小对其承载能力的影响规律。试验结果表明，三面包 柱梁式柱托换节点有良好的承载能力和延性，破坏形态为新旧混凝土界面滑移与托换梁底冲切破坏；托换节点的承 载能力与施加的预应力大小呈高度线性关系；当本文试件每个面施加30kN 的预应力时，极限承载力可提高约78.84%。 关键词 柱托换 三面包柱梁 有限元 预应力 受力性能: ; ; ; ; 中图法分类号:TU746.6 文献标识码:A 文章编号: 1000-2324(2017)02-0178-08 StudyonPerformanceofUnderpinningJointwithThreeSidesBeams EnclosedRCColumn 1* 1 2 YUXiao ,WU Er-jun ,WANGTing 1.Collegeof Civiland TransportationEngineering/Hohai University,Nanjing 210098,China 2.Collegeof Harbor,Coastaland OffshoreEngineering/Hohai University,Nanjing 210098,China Abstract: In structural underpinning projects, the construction space of one side’s concrete column could often be narrow, thus the common underpinning method four sides beams enclosed RC column of is not applicable. This paper introduced a kind ofunderpinningjoint with three sidesbeams enclosedRC column column in combination with aproject case, andmade force analysis on that through finite element calculation which verified the reliability of the design, and inspected the influence rule of its failure mode, stress mechanism and prestress size on its carrying capacity via experiments. The experiment results showed that the underpinning joint with three sides beams enclosed RC column has a good bearing capacity and drawability,and the destruction pattern isthenew-old concrete interface