Numerical study of concrete-encased CFST under preload followed by sustained service load

Li, Gen1; Hou, Chao2; Han, Lin-Hai3; Shen, Luming1

2020-04-10

10.12989/scs.2020.35.1.093

STEEL AND COMPOSITE STRUCTURES   影响因子和分区

1229-9367

1598-6233

Developed from conventional concrete filled steel tubular (CFST) members, concrete-encased CFST has attracted growing attention in building and bridge practices. In actual construction, the inner CFST is erected prior to the casting of the outer reinforced concrete part to support the construction preload, after which the whole composite member is under sustained service load. The complex loading sequence leads to highly nonlinear material interaction and consequently complicated structural performance. This paper studies the full-range behaviour of concrete-encased CFST columns with initial preload on inner CFST followed by sustained service load over the whole composite section. Validated against the reported data obtained from specifically designed tests, a finite element analysis model is developed to investigate the detailed structural behaviour in terms of ultimate strength, load distribution, material interaction and strain development. Parametric analysis is then carried out to evaluate the impact of significant factors on the structural behaviour of the composite columns. Finally, a simplified design method for estimating the sectional capacity of concrete-encased CFST is proposed, with the combined influences of construction preload and sustained service load being taken into account. The feasibility of the developed method is validated against both the test data and the simulation results.

concrete-encased CFST construction preload sustained service load numerical analysis sectional capacity

SCI ; EI

英语

通讯

National Natural Science Foundation of China (NSFC)[51678341]

Construction & Building Technology ; Engineering ; Materials Science

Construction & Building Technology ; Engineering, Civil ; Materials Science, Composites

WOS:000523612900007

TECHNO-PRESS

20201708509268

Structural analysis

Structural Design, General:408.1 ; Concrete:412

ENGINEERING

Web of Science

1.Univ Sydney, Sch Civil Engn, Sydney, NSW 2006, Australia
2.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen 518055, Peoples R China
3.Tsinghua Univ, Dept Civil Engn, Beijing 100086, Peoples R China

Li, Gen,Hou, Chao,Han, Lin-Hai,et al. Numerical study of concrete-encased CFST under preload followed by sustained service load[J]. STEEL AND COMPOSITE STRUCTURES,2020,35(1):93-109.

Li, Gen,Hou, Chao,Han, Lin-Hai,&Shen, Luming.(2020).Numerical study of concrete-encased CFST under preload followed by sustained service load.STEEL AND COMPOSITE STRUCTURES,35(1),93-109.

Li, Gen,et al."Numerical study of concrete-encased CFST under preload followed by sustained service load".STEEL AND COMPOSITE STRUCTURES 35.1(2020):93-109.