Achieving a strong and stiff bolted connection with concrete filled steel tube (CFST) has been challenge to structural engineers, therefore enhance the performance, blind-bolts that are extended anchor in core have recently developed. Though some experimental tests investigate performance of were conducted, holistic understanding hollo-bolts remains be at scarce because certain limitations prog...

In terms of load transfer, the design joints in concrete-filled steel tubular (CFST) arch bridges is more critical than that buildings due to higher likelihood steel–concrete-interface debonding. To improve contact at steel–concrete interface, a novel rib was manufactured by longitudinally welding perfobond-rib-shear connectors inner surface tube and then filling with concrete. this study, exte...

Concrete-filled steel tubular X-column (CFST X-column) is a novel structural member, which of potential in the diagrid systems and cooling tower support systems. In this paper, stability slender CFST experimentally numerically investigated. Firstly, three X-columns are constructed tested subjected to axial compression. The failure modes load–deformation curves respectively recorded during these...

Incorporating waste byproducts into concrete is an innovative and promising way to minimize the environmental impact of material while maintaining and/or improving concrete’s mechanical characteristics strength. The proper application sawdust as a pozzolan in building industry remains significant challenge. Consequently, this study conducted experimental evaluation fill material. In particular,...

Due to complexities from the interaction between steel tube and concrete filling of concrete-filled tubular (CFST) columns, their strengths are very complicated, which is a highly nonlinear relation with material geometry. Categorical gradient Boosting (CatBoost), advanced boosting machine, presented solve problems. A total 3103 tests, divided in four datasets, trained tested learners determine...

This paper presents an experimental and numerical study on the lateral impact behavior of rubberized-fibrous concrete-filled steel tubular (CFST) columns. Four types concrete were utilized in program infilled columns: normal (NC), rubberized (RuC), fiber (SFC), hybrid RuC-SFC. Twelve specimens tested using drop-weight with fixed-sliding boundary conditions. Three different transverse energies p...

Abstract Stress concentration factors (SCFs) are used to quantify the hot-spots stress in tubular joints with circular hollow section for fatigue assessment, which always obtained by finite element analysis or specimens testing. According design specifications, complex formulas recommended calculate SCFs at special locations of intersection lines weld toe individual load cases. To improve perfo...

This paper presents eight experimental tests on circular concrete-filled steel tubular (CFST) beam-columns loaded under unequal eccentricities at both ends. loading scheme has not been widely studied yet in previous research works CFST columns, but it may be very common into industrial or residential multi-storey frames, where ends are subjected to different bending moments. Tests results revea...

Eurocode EN 1994-1-1 currently covers design of concrete-filled steel tubular (CFST) columns using normal strength materials with nominal yield (fy) not more than 460 MPa and concrete characteristic cylinder less 50 MPa. As high have been increasingly used in construction, this paper aims to extend current equation for square rectangular CFSTs incorporate materials. A comprehensive experimental...

• An optimization strategy was conducted to obtain a final set of ANN model. The developed model exhibited superior performance than current codes and empirical equations. explicit equation based on Artificial Neural Networks were derived for practical application. In this paper an Network (ANN) is the prediction ultimate compressive load rectangular Concrete Filled Steel Tube (CFST) columns, t...