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为研究开孔板(PBL)连接件的受剪承载力,在已有试验和理论研究的基础上,分析了单孔PBL连接件的破坏模式及受剪承载力的主要影响因素,并建立开孔钢板厚度不小于9 mm时,单孔PBL连接件考虑侧向约束力的受剪承载力模型。该模型考虑了开孔钢板周围的混凝土包裹、贯通钢筋和试件底面摩擦对PBL连接件提供的较强约束作用,以及由此导致的单孔PBL连接件受剪承载力的提高。通过大量的单孔PBL连接件的受剪试验数据拟合得到单孔PBL连接件的受剪承载力计算公式。该计算公式和已有计算公式的计算值与试验值的对比分析表明,未设置贯通钢筋的试件受剪承载力的离散性较大,而设置贯通钢筋的试件受剪承载力的离散性相对较小;该计算公式能合理考虑混凝土包裹、贯通钢筋和试件底面摩擦对PBL连接件受剪承载力的影响,其计算结果与试验值总体吻合得较好。
In order to study the shear capacity of perforated plate (PBL) connectors, based on the existing experimental and theoretical studies, the main influencing factors of failure mode and shear capacity of single-hole PBL connectors were analyzed and established When the thickness of the hole plate is not less than 9 mm, the model of lateral restraining shear capacity is taken into account for the single-hole PBL connector. The model takes into account the concrete wrap around the perforated steel plate, the strong restraint provided by the rubbing between the reinforcing steel bar and the bottom surface of the specimen to the PBL joint, and the consequent increase of the shear capacity of the single-hole PBL joint. The calculation formula of the shear capacity of single-hole PBL connector is obtained by fitting the shear test data of a large number of single-hole PBL connectors. The comparison between the calculated value and the calculated value of the calculated formula and the experimental value shows that the shear strength of the specimen without through rebar is larger and the shear capacity of the specimen with through- The calculation formula can reasonably consider the influence of the concrete package, the penetration of the friction between the steel bar and the specimen on the shear capacity of the PBL connector, and the calculation results are in good agreement with the experimental values.