Shear Transfer in the Panel Zone of Steel Beam to Concrete-Filled Steel Tubular Connections

• Main Author: 林衍宏
• Other Authors: 鄭錦銅
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/53380472899285164067

碩士 === 國立高雄第一科技大學 === 營建工程系 === 89 === Based on the literatures on seismic behavior of CFT column, it is found that the circular tubes may provide better confinement and ductility than the rectangular one. In this research, performance of connections with steel beam to concrete-filled steel pipe column was investigated to study the seismic behavior such as force transfer, damage pattern and ductility. Parameters included the ratio of tube diameter-thickness, connection type, and axial load. Proposed herein is a nonlinear model for the shear transfer in panel zone of CFT connections. This model superimposed the shear resistance of tube wall and diagonal concrete strut inside the tube. Five tests of circular CFT beam column connections were conducted to validate the proposed theory. Test results showed that all specimens failed due to welding fracture at various locations while entering nonlinear range. It is found that the higher the axial load applied, the better the ductility. The reason may be the residual tensile stress build up due to the welding of diaphragm to the tube wall remarkably reduced the deformation capacity of columns. The residual tensile stress is about 69MPa. Comparison of analytical and experimental results for panel shear showed that proposed model can be predicted.