Crestbond shear connectors for load transfer in concrete filled tube columns

Abstract This paper presents an experimental study with numerical modeling of Crestbond shear connectors in concrete filled tube columns. The Crestbond, which consists in a steel plate with regular cuttings, was originally conceived for composite beams and is now being proposed as an alternative device for load introduction and shear transfer at the steel-concrete interface in concrete filled tube columns. The results achieved in this work were very favorable to the new application proposed for the connector as high values of shear strength were obtained. Moreover, the numerical and experimental results enabled comparative analysis and investigations regarding the influence of concrete conditions and the geometry of the column section on the mechanical properties of the connector.

摘要
本研究针对钢管混凝土柱（concrete filled tube columns）中的Crestbond抗剪连接件（Crestbond shear connectors）开展了结合数值模拟的试验研究。该连接件由带规则切口的钢板构成，最初专为组合梁设计，如今被提出用于钢管混凝土柱的钢-混凝土界面处，作为荷载引入与剪力传递的替代装置。本研究获得的试验结果有力支持了该连接件的新应用方案，所得抗剪强度数值可观。此外，借助数值模拟与试验结果，可针对混凝土工况及柱截面几何参数对连接件力学性能的影响开展对比分析与相关研究。