The axial compression bearing capacity of reinforced recycled aggregate concrete filled square steel tube short column with dual constraints

Changjiang Liu , Yaojun Deng , Jian Liu , Chiyu Luo , Qigong Xu , Guangen Zhou , Wei Xiong , Hua Dong

Abstract

This paper focuses on investigating the axial bearing capacity of Reinforced Recycled Aggregate Concrete (RRAC) Filled Square Steel Tube (RRACFSST) short columns. The research takes into account the double constraints of square steel tubes and steel cages, conducting a nonlinear simulation study on RRACFSST. The compressive bearing capacity of square steel pipe in nonlinear simulation is determined. The axial bearing capacity of RRACFSST short columns is analyzed using the limit analysis method and the Ferrule theory. A formula is proposed to calculate the axial bearing capacity of RRACFSST short columns, considering factors such as the width to thickness ratio of the steel tube, recycled coarse aggregate replacement rate, reinforcement ratio, and constrained effect coefficient. These influencing factors are also analyzed. The formula's accuracy and applicability are verified by comparing it with literature experimental values and finite element simulation values based on theoretical derivation. The research findings provide a theoretical basis for designing the axial compression bearing capacity of square steel tube RRAC short columns. Additionally, the study proposes a novel steel pipe-constrained RAC system, combining steel with RAC to enhance ductility, compressive strength, and seismic resistance, offering significant social and economic benefits.

Key Words

axial bearing capacity; constrained effect coefficient; limit analysis method; recycled coarse aggregate replacement rate; RRAC Filled Square Steel Tube (RRACFSST) short columns

Address

Changjiang Liu — School of Civil Engineering and Transportation, Guangzhou University, Guangzhou 510006, China; Research Center of Complex Steel Structure Engineering Technology, Guangzhou University, Guangzhou 510006, China; Guangdong Provincial Key Laboratory of Earthquake Engineering and Applied Technology, Guangzhou 510006, China
Yaojun Deng — School of Civil Engineering and Transportation, Guangzhou University, Guangzhou 510006, China
Jian Liu — School of Civil Engineering and Transportation, Guangzhou University, Guangzhou 510006, China; Research Center of Complex Steel Structure Engineering Technology, Guangzhou University, Guangzhou 510006, China
Chiyu Luo — Guangdong Architectural Design and Research Institute Co., LTD, Guangzhou 510010, China
Qigong Xu — Guangdong Jianke Architectural Design Institute Co., LTD, Guangzhou 510599, China
Guangen Zhou — Southeast Space Frame Group Co., LTD, Hangzhou, 311209, China
Wei Xiong — Guangzhou Design Institute Group Co., LTD, Guangzhou 510620, China
Hua Dong — China Construction Third Engineering Bureau Co., LTD, Wuhan 430064, China

PDF Viewer

Preview is limited to the first 3 pages. Sign in to access the full PDF.

← Back to Volume 94, No. 6