PBL抗剪传力钢筋连接接头受拉力学性能试验

Experimental investigation on the tensile capacity of steel bar connectors using PBL shear key

装配式混凝土构件间钢筋的连接是其适用性和经济性的关键环节,针对国内工程常用的灌浆套筒和约束浆锚钢筋连接技术存在施工难度大、效率低、质量不易检验等问题,本文提出了PBL-穿孔钢筋连接接头、PBL-穿孔钢管连接接头和PBL-U形钢筋连接接头3种钢筋连接接头,实现预制混凝土单元间钢筋应力的传递,具有施工简便、质量易保证、成本低等优势。对这3种钢筋接头进行了6组参数共18个钢筋接头试件的拉伸性能试验,研究了新型接头试件的破坏模式、承载力和变形能力等,得到各参数对新型接头拉伸强度的影响规律,并对不同接头的受拉力学性能进行对比分析。研究结果表明:3种钢筋连接接头能够实现钢筋应力的有效传递,验证了新型钢筋连接接头的可行性。

The connection of steel bars between prefabricated concrete components is crucial for the suitability and cost-effectiveness of constructing projects.In the Chinese engineering field,grouted sleeve connections and grouted spiral-confined lap connections are commonly used steel bar connection technologies.However,these two connection methods have shortcomings,including construction difficulties,low efficiency,and challenges in quality inspection.This paper proposes three kinds of steel bar connectors:the PBL-perforated rebar connection,the PBL-perforated tube connection,and the PBL-U rebar connection.The proposed steel bar connectors facilitate the reinforcement stress transfer between different precast concrete members while offering advantages like ease of construction,effective quality control,and reduced costs.Experimental investigations were conducted on 18 specimens,including all 3 connector types across 6 parameter groups.This study examined their tensile capacities,failure modes,bearing capacities,and deformation characteristics,deriving the influences of different factors on the tensile strength of the proposed steel bar connectors.Additionally,comparisons were made regarding the mechanical properties of tensile strength among the three steel bar connectors.The results show that all three steel bar connectors effectively transmit load through rebars,preliminarily verifying the validity of the proposed steel bar connectors.