TY - JOUR

T1 - Experimental research on influence of multi-level loading on axial compression behavior of concrete-filled circular steel tubular short columns

AU - Tong, Donghua

AU - Yu, Min

AU - Bao, Hao

AU - Ye, Jianqiao

PY - 2017/11/1

Y1 - 2017/11/1

N2 - In order to study the mechanical properties of early-age concrete-filled steel tube (CFST) under continuous construction process, an experimental investigation on six concrete-filled circular steel tubular short columns under multi-level loading was carried out. The influence of multi-level loading with different initial stress degrees, loading time intervals and loading levels on the deformation progression was analyzed. The bearing capacity of the columns was then tested at 28 days after the multi-level loading. The results show that creep deformation of the concrete-filled steel tubes under multi-level loading is significant and cannot be neglected. The deformation of the columns is significantly affected by the applied loading scheme. An increase of the initial stress degrees and increment of loading levels, or a reduction of loading time interval will all result in an increase of the deformation of the columns. However, the multi-level loading process has only small impact on the bearing capacity of the CFST short columns after 28 days.

AB - In order to study the mechanical properties of early-age concrete-filled steel tube (CFST) under continuous construction process, an experimental investigation on six concrete-filled circular steel tubular short columns under multi-level loading was carried out. The influence of multi-level loading with different initial stress degrees, loading time intervals and loading levels on the deformation progression was analyzed. The bearing capacity of the columns was then tested at 28 days after the multi-level loading. The results show that creep deformation of the concrete-filled steel tubes under multi-level loading is significant and cannot be neglected. The deformation of the columns is significantly affected by the applied loading scheme. An increase of the initial stress degrees and increment of loading levels, or a reduction of loading time interval will all result in an increase of the deformation of the columns. However, the multi-level loading process has only small impact on the bearing capacity of the CFST short columns after 28 days.

KW - Bearing capacity

KW - Concrete-filled steel tube

KW - Creep

KW - Early age

KW - Multi-level loading

U2 - 10.14006/j.jzjgxb.2017.S1.033

DO - 10.14006/j.jzjgxb.2017.S1.033

M3 - Journal article

AN - SCOPUS:85046851279

VL - 38

SP - 241

EP - 248

JO - Jianzhu Jiegou Xuebao/Journal of Building Structures

JF - Jianzhu Jiegou Xuebao/Journal of Building Structures

SN - 1000-6869

ER -