Abstract
In recent decades, connections between concrete-filled steel tubular columns (CFST) and H-steel beams have been well designed and implemented. However, owing to the detail of the weld, brittle failure often occurs at weld seams. In this study, an innovative joint was developed to connect CFST columns and H-steel beams using a top-weld bottom-bolt connection to minimize the effect of welding quality on the seismic resistance of joints. Six specimens were designed for cycle-reversed loading tests to discuss the seismic performance of this joint. Four configurations, including different connection methods, beam heights, column forms, and stiffener thicknesses, were considered in the test. The impacts of different configuration forms on the failure mode, strength, stiffness, ductility, and energy dissipation of the specimens were evaluated. The test results demonstrated that the columns with or without concrete had a significant effect on the deformation capacity. However, a smaller effect was observed on other indicators. The replacement of the through-diaphragm and an increase in the beam height adversely influenced the ductility of the joint. Moreover, changing the stiffener thickness and using a full-bolted connection affected the failure mode. The joint type analyzed in this study satisfies the strong column–weak beam design criterion and the related seismic provisions.
Highlights
Concrete-filled steel tubular (CFST) columns, which possess the advantages of steel and concrete, have been widely applied in frame structure systems and other modern building structures in the recent decades because of their high bearing capacity, excellent seismic performance, low cost, good fire resistance, and high construction efficiency (Han et al 2014; Wu et al 2016; Yu et al.2019)
To study the seismic behavior of top-weld bottom-bolt (TWBB) joints, five full-scale specimens with top-flange-welded35
Bottom-flange-bolted connection and one full-bolted connection specimen were tested under cyclic loading
Summary
Concrete-filled steel tubular (CFST) columns, which possess the advantages of steel and concrete, have been widely applied in frame structure systems and other modern building structures in the recent decades because of their high bearing capacity, excellent seismic performance, low cost, good fire resistance, and high construction efficiency (Han et al 2014; Wu et al 2016; Yu et al.2019). CFST components and structures have been studied extensively for several decades and are still being investigated and improved in terms of theoretical calculations, structural performance, and construction efficiency (Skalomenos et al 2016; Castro et al 2016; Denavit et al 2020). Connections are considered to be the most critical members in CFST composite frame structures. They have a significant impact on the overall load transfer mechanism and internal force distribution of structures. An important research direction is to study novel CFST column-beam joints with excellent seismic performance
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