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논문 기본 정보

자료유형
학술저널
저자정보
Haibo Jiang (Guangdong Univ. of Technology) Haozhen Fang (Guangdong Univ. of Technology) Jinpeng Wu (Guangdong Univ. of Technology) Zhuangcheng Fang (Guangdong Univ. of Technology) Shu Fang (Guangzhou University) Gongfa Chen (Guangdong Univ. of Technology)
저널정보
국제구조공학회 Steel and Composite Structures, An International Journal Steel and Composite Structures, An International Journal Vol.45 No.6
발행연도
2022.12
수록면
797 - 818 (22page)

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Steel–precast ultra-high-performance concrete (UHPC) composite beams with demountable high-strength friction grip bolt (HSFGB) shear connectors can be used for accelerated bridge construction (ABC) and achieve excellent structural performance, which is expected to be dismantled and recycled at the end of the service life. However, no investigation focuses on the demountability and reusability of such composite beams, as well as the installation difficulties during construction. To address this issue, this study conducted twelve push-out tests to investigate the effects of assembly condition, bolt grade, bolt– hole clearance, infilling grout and pretension on the crack pattern, failure mode, load–slip/uplift relationship, and the structural performance in terms of ultimate shear strength, friction resistance, shear stiffness and slip capacity. The experimental results demonstrated that the presented composite beams exhibited favorable demountability and reusability, in which no significant reduction in strength (less than 3%) and stiffness (less than 5%), but a slight improvement in ductility was observed for the reassembled specimens. Employing oversized preformed holes could ease the fabrication and installation process, yet led to a considerable degradation in both strength and stiffness. With filling the oversized holes with grout, an effective enhancement of the strength and stiffness can be achieved, while causing a difficulty in the demounting of shear connectors. On the basis of the experimental results, more accurate formulations, which considered the effect of bolt–hole clearance, were proposed to predict the shear strength as well as the load–slip relationship of HSFGBs in steel–precast UHPC composite beams.

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