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剪力键的荷载-滑移特征是混合结构简化有限元分析的基础。为研究混合结构PBL剪力键(Perfobond strip connectors)群的剪力传递,基于三批24组较大规模的PBL剪力键静载试验,借助于分布式光纤传感测试技术,深入分析了PBL剪力键的受力机理及影响其荷载-滑移的重要因素,提出了PBL剪力键极限承载力的计算公式;根据总体标准差的估算原理及回归分析,归纳出PBL剪力键弹性极限及承载能力极限状态下的荷载-滑移特征,得到了剪力键加载过程的荷载-滑移全曲线表达式。试验研究表明:设置穿孔钢筋的混合结构PBL剪力键具有较高的极限承载力和良好的延性性能,穿孔钢筋对PBL剪力键的荷载-滑移特征影响显著,开孔钢板与外围混凝土间的剪力-摩擦效应是PBL剪力键承载力构成的重要部分;PBL剪力键的弹性极限荷载对应于0.35倍的承载能力极限荷载,其屈服荷载约为极限承载力的0.695倍;荷载-滑移全曲线中弹性段可由直线表征,非线性段曲线服从对数分布。
The shear-key load-slip characteristics are the basis for the simplified finite element analysis of hybrid structures. In order to study the shear transfer of the PBL shear-resistant PBLs in a hybrid structure, based on the batch test of 24 groups of larger PBL shear keys, the PBL The force mechanism of shear bond and the important factors that affect its load-slip are put forward. The formulas for calculating the ultimate bearing capacity of PBL shear bond are deduced. Based on the estimation principle of total standard deviation and regression analysis, the elastic limit of PBL shear bond And the load-slip characteristics under the ultimate capacity of load-bearing capacity, the expressions of load-slip total curve during the shear stress loading process are obtained. The experimental results show that the PBL shear bond of the hybrid structure with perforated reinforcement has higher ultimate bearing capacity and good ductility, and the perforated reinforcement has a significant effect on the load-slip characteristics of the PBL shear bond. Between the perforated steel plate and the surrounding concrete The shear-friction effect of PBL is an important part of the bearing capacity of PBL shear bond. The elastic ultimate load of PBL shear bond corresponds to 0.35 times the ultimate load of ultimate bearing capacity, and the yield load is about 0.695 times the ultimate bearing capacity. The load- The elastic section in the full slip curve can be characterized by a straight line, while the non-linear section curve follows a logarithmic distribution.