Study on Bearing Capacity of the Connection between Concrete-Filled Twin Steel Tubes Column and Steel Beam

Abstract

This study evaluates the bearing capacity of a new type of connection between the concrete-filled twin steel tubes (CFTST) column and steel beams. The formation and feature of the connection were described. The tensile force from girder flange is mainly transferred by vertical stiffener and anchorage plate according to the analysis of experiment and finite element simulation, so the model of tensile beam flange was proper to analyze the bearing capacity of the joint. Theoretical formula to calculate the load-bearing capability of this joint was derived. Compared with experimental results,calculated results were basically correct but conservative. Theoretical formula to calculate the load-bearing capability of this joint was derived from the model of tensile beam flange. Compared with experimental results, calculated results with the error of 2.16~4.14%, were basically correct but conservative. All the research results can provide a basis for its further research and application in practice.