Lu Wenru, Li Donghui, Huang Yuanming, Wu Jun
School of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China.
Henan Urban Planning Institute & Corporation, Zhengzhou 450044, China.
Materials (Basel). 2023 Mar 13;16(6):2291. doi: 10.3390/ma16062291.
In order to improve the shear resistance and structural ductility of the perfobond rib (PBL) connector, a new PBL connector with steel-rubber tenon is proposed in this study, which aims to increase the shear load capacity of the connector while improving the ductility of the connector. First, models of new PBLs are established based on the validated finite element method, and their mechanical properties are compared with other shear connectors. The results show that the stiffness and shear load capacity of the proposed connector can be effectively improved when the steel ring is added, where the shear stiffness can be reduced, and the deformation capacity of the specimen can be improved when the rubber ring is added. When a steel ring with a thickness of 5 mm and a rubber ring with a thickness of 5 mm are involved, the shear load capacity of the connector with steel-rubber tenon is increased by 13.7%, and the shear stiffness is reduced by 37.3% compared to the conventional concrete tenon connector, while the ductility is increased by 75.1% compared to the connector with steel ring tenon. Subsequently, as for the connectors with steel-rubber tenon, the effects of the thickness of the steel ring, the thickness of the rubber ring, the diameter of perforated rebar, the strength of concrete and the strength of perforated steel plate are analyzed based on the finite element model of a PBL. The results show that an increase in the thickness of the steel ring, the diameter of the perforated rebar and the strength of the concrete will cause an increase in the shear stiffness and shear load capacity of the connector; however, an increase in the thickness of the rubber ring can cause a decrease in the shear stiffness and shear load capacity of the connector, while a change in the strength of perforated steel plate has little effect on the shear stiffness and shear load-carrying capacity. Finally, based on the finite element parametric analysis results and the damage mechanism of the proposed connector, a calculation equation applicable to the PBL connector with steel-rubber tenon is presented to predict the shear load capacity of the connector.
为了提高开孔板连接件（PBL）的抗剪能力和结构延性，本研究提出了一种新型带钢-橡胶榫的PBL连接件，旨在提高连接件的抗剪承载力的同时改善其延性。首先，基于经过验证的有限元方法建立新型PBL连接件模型，并将其力学性能与其他抗剪连接件进行比较。结果表明，增加钢环时，所提连接件的刚度和抗剪承载力能得到有效提高，增加橡胶环时，抗剪刚度会降低，试件的变形能力会提高。当采用厚度为5mm的钢环和厚度为5mm的橡胶环时，带钢-橡胶榫的连接件的抗剪承载力比传统混凝土榫连接件提高了13.7%，抗剪刚度降低了37.3%，而延性比带钢环榫连接件提高了75.1%。随后，对于带钢-橡胶榫的连接件，基于PBL有限元模型分析了钢环厚度、橡胶环厚度、开孔钢筋直径、混凝土强度和开孔钢板强度的影响。结果表明，钢环厚度、开孔钢筋直径和混凝土强度的增加会导致连接件的抗剪刚度和抗剪承载力增加；然而，橡胶环厚度的增加会导致连接件的抗剪刚度和抗剪承载力降低，而开孔钢板强度的变化对抗剪刚度和抗剪承载能力影响较小。最后，基于有限元参数分析结果和所提连接件的破坏机理，给出了适用于带钢-橡胶榫PBL连接件的计算方程，以预测该连接件的抗剪承载力。
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