Shear and Pull-Out Performance of Ribbed Straight-Hooked Rebar Shear Connector
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摘要:
为简化钢壳-混凝土组合索塔结构构造并提升建造效率，对新型的带肋直钩钢筋剪力键进行研究. 首先，对该新型剪力键设计推出与拔出荷载试验，得到各试件的剪切承载力、拔出承载力及相应破坏特征；其次，结合有限元软件进行分析，建立试件破坏模式与承载力之间的对应关系；最后，在分析模型基础上，进一步探讨埋深对剪力键性能的影响，并提出直钩钢筋剪力键的剪切与拔出承载力计算式. 研究结果表明：直钩钢筋剪力键在剪切荷载下表现为加劲肋屈服，在拔出荷载下表现为混凝土冲切破坏，并伴随着直钩钢筋屈服，破坏模式的不同使剪力键的承载力差距最大可达5倍；推出荷载下钢混黏结力占总承载力的30%；直钩钢筋的位置决定了其在拔出荷载下的受力特点及失效模式；减小直钩钢筋与加劲肋间距后，剪力键的拔出承载力提升了35%，增大1倍剪力键埋深后，拔出承载力提升了1倍.
Abstract:To simplify the steel shell–concrete composite pylon structure and improve construction efficiency, a novel ribbed straight-hooked rebar (RSHR) shear connector was studied. Firstly, the push-out and pull-out tests of the shear connector were designed. The shear bearing capacity, pull-out bearing capacity, and failure characteristics of each specimen were obtained. Secondly, the corresponding relationship between the failure mode and the bearing capacity of the specimen was obtained by using finite element analysis software. Finally, based on model analysis, the influence of the burial depth on the shear connector performance was further discussed, and the formula for calculating the shear and pull-out bearing capacity of the RSHR shear connector was proposed. The results show that under shear loading, the RSHR shear connector undergoes yielding of its stiffening ribs, while under pull-out loading, concrete punching failure occurs. Along with the yielding of the straight-hooked rebar, the difference in failure modes can cause the shear connector’s bearing capacity to vary by up to five times. Under push-out loading, the steel–concrete bonding force accounts for 30% of the total bearing capacity. The position of the straight-hooked rebar determines its stress characteristics and failure modes under pull-out loading. Reducing the spacing between the straight-hooked rebar and stiffening ribs increases the pull-out bearing capacity of the shear connector by 35%, while doubling the burial depth of the shear connector makes the pull-out bearing capacity increase by one time.
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Key words:
- composite structure /
- connector /
- shear loading /
- pull-out test /
- bearing capacity
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图 2 组合索塔剪力键受力特征
Figure 2. Stress characteristics of shear connector for composite pylon
表 1 试件参数
Table 1. Specimen parameters cm
荷载类型 编号 D 推出 S0 0 S40 40 S80 80 拔出 T0 0 T40 40 T80 80 
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表 2 承载力公式结果与试验结果对比
Table 2. Comparison between bearing capacity calculated by formula and obtained from test
kN 试件名 试验值 公式 S0 932 797 S40 871 797 S80 771 797 T0 191 193 T40 198 182 T80 142 171
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