Techno Press
Techno Press

Steel and Composite Structures   Volume 22, Number 6, December30 2016, pages 1217-1238
DOI: http://dx.doi.org/10.12989/scs.2016.22.6.1217
 
Studies on restoring force model of concrete filled steel tubular laced column to composite box-beam connections
Zhi Huang, Li-Zhong Jiang, Wang-Bao Zhou and Shan Chen

 
Abstract     [Full Text]
    Mega composite structure systems have been widely used in high rise buildings in China. Compared to other structures, this type of composite structure systems has a larger cross-section with less weight. Concrete filled steel tubular (CFST) laced column to box-beam connections are gaining popularity, in particular for the mega composite structure system in high rise buildings. To enable a better understanding of the destruction characteristics and aseismic performance of these connections, three different connection types of specimens including single-limb bracing, cross bracing and diaphragms for core area of connections were tested under low cyclic and reciprocating loading. Hysteresis curves and skeleton curves were obtained from cyclic loading tests under axial loading. Based on these tested curves, a new trilinear hysteretic restoring force model considering rigidity degradation is proposed for CFST laced column to box-beam connections in a mega composite structure system, including a trilinear skeleton model based on calculation, law of stiffness degradation and hysteresis rules. The trilinear hysteretic restoring force model is compared with the experimental results. The experimental data shows that the new hysteretic restoring force model tallies with the test curves well and can be referenced for elastic-plastic seismic analysis of CFST laced column to composite box-beam connection in a mega composite structure system.
 
Key Words
    steel concrete composite connection; concrete filled steel tube (CFST); box-beam column connections; hysteretic restoring force model; seismic performance; connection behavior
 
Address
(1) Zhi Huang, Li-Zhong Jiang, Wang-Bao Zhou:
School of Civil Engineering, Central South University, Changsha 410075, China;
(2) Zhi Huang:
Department of Civil Engineering, The Pennsylvania State University, Middletown 17057, PA, USA;
(3) Shan Chen:
Hunan institute of nonferrous geological exploration and research, Changsha 410015, China.
 

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