【摘要】 为研究栓钉剪力连接件受力机理及其在不同强度混凝土中的有效受力长度，进行不同长度栓钉剪力连接件推出试验和精细化有限元参数分析。基于精细化数值模型，分析栓钉及其周围混凝土受力机理，得到栓钉周围混凝土主应力迹线，揭示混凝土力流传递路径。研究结果表明：栓钉受力分为弹性和塑性两个阶段，混凝土强度不变时，栓钉长度变化对栓钉抗剪性能影响较小。基于应力分布规律，栓钉周围混凝土分为三个受力区域，即栓帽上方受压拔区、栓帽下方受拔区和栓钉根部下方受压区。栓钉有效受力长度随混凝土抗压强度增加而减小。以直径19 mm栓钉为例，当混凝土抗压强度为20、30、40和50 MPa时，栓钉有效受力长度为4.42d(d为栓钉直径)、4.00d、3.68d和3.42d。更多还原

【Abstract】 In order to study the force transfer mechanism of stud shear connectors and effective force transfer length in different concrete strength,push-out test with different stud lengths and refined finite element parametric analysis were carried out.Based on the refined numerical model,the force transfer mechanism of the studs and its surrounding concrete was analyzed,the concrete main stress trajectory was obtained,and the concrete force flow transfer path was revealed.The results show that the shear behavior of studs consists of two stages,namely elastic stage and plastic stage.Stud’s length has little influence on the shear performance of the studs.The concrete can be divided into three zones,namely compression zone underneath the stud,compression-uplift zone above the stud and uplift zone underneath the stud.The stud effective force transfer length decreases as the concrete compressive strength increases.When the compressive strength of concrete is 20,30,40 and 50 MPa,the stud effective force length is 4.42d(d is the diameter of the stud),4.00d,3.68d and 3.42d.更多还原