Concrete-encased concrete-filled steel tube (CFST) composite columns provide high bearing capacity, good seismic performance and an easier connection with arbitrary angle beams, which are widely used in high-rise buildings. Considering the frequency of building fires, experimental research investigated axial compressive behavior columns’ exposure to temperature this paper. Fourteen specimens after temperatures different parameters, including heating temperature, diameter concrete cover...

Concrete-filled steel tube (CFST) widely applied in engineering structures due to its superior behavior requires monitoring and assessment for damage level. Here, the acoustic emission (AE) technique was used monitor fracture process of concrete core CFST stub columns subjected axial compression. Test analyzed results show that specimens can be divided into four stages: compaction, elastic-plastic stage, strengthening secondary strengthening. In evolutionary features AE event rate,...

The bond strength between materials is the basis of cooperative work composite structures. This study aims to investigate bonding performance push-out tests conducted on self-compacting rubberized concrete-filled steel tubes (SCRCFST). rubber content, particle size, interface length, and water–cement ratio were varied evaluate their impact strength. failure mode mechanism analyzed. damage energy consumption capacity investigated. Moreover, this reveals characteristics stress–slip curve...

Summary Modern traditional‐style steel (MTS) structure is an innovative architecture that widely used in China. This paper explores the possibility of using viscous damper, which can be conveniently installed between beam and column, to replace “sparrow brace” at beam–column joints improve its seismic capability. Three 1/2.6 scaled MTS double joints, one without damper two with were fabricated tested under dynamic cyclic loading. The results indicated primary failure modes cracking base...

Summary This paper innovatively designs polyvinyl chloride tube (PVCT) with high‐strength concrete (HC) and presents the results of cyclic loading tests on new reinforced short columns, including three concrete‐filled PVCT (HC‐PVCT) one steel column HC column. The main objective this research was to evaluate seismic behaviors columns based quasistatic test columns. design parameters in experiments were axial compression ratio, reinforcement measures, strength, stirrups configuration,...

This paper mainly focused on the seismic performance and shear calculation method of steel reinforced high-strength concrete (SRHC) columns with rectangular helical hoops. An experimental investigation was performed in this paper. Eleven SRHC hoops one ordinary were constructed at laboratory Guangxi university. The failure modes, hysteresis loops, envelope curves, characteristic loads displacements cumulative damage analysis are presented investigated. It can be seen from test results that...

Rubberised concrete is a type of light, green building material, which prepared by mixing rubber powder or crumb into ordinary in certain proportion. Similarly, using vibration-free technology, can be added to self-compacting (SCC) prepare (SCRC). Uniaxial compression tests were carried out on SCRC made with two particle sizes at different strain rates, and the effects rate content dynamic mechanical properties studied. The microstructure specimens before after damage was analysed. Compared...

The existing method to improve the coordination performance of inner and outer parts concrete-encased concrete-filled steel tube (CFST) composite columns by increasing volume-stirrup ratio causes difficulties in construction due over-dense stirrups. Thus, this paper proposes an open polygonal stirrup with high strength ductility CRB600H reinforced rebar, seventeen specimens were constructed, their axial compressive was tested. main parameters considered ratio, size, type strength. test...

Summary To investigate the seismic behavior of high‐strength concrete‐encased concrete‐filled steel tube (HSC‐encased CFST) composite column, eight specimens with a high axial compression ratio were tested under lateral cyclic loading and constant compressive in this paper. Key points on load–displacement skeleton curve columns obtained based experimental results. The test parameters include ratio, volume stirrup form, diameter‐width ratio. All failed flexural mode, crushing concrete losing...