Fundamental Study Using New Test Loading Scheme for Steel Frame Subassembly With Damper Connection Details

Abstract

The performance of passively-controlled building depends not only on damper but also on frame members and connections. Frame members are subjected to bending moment and shear force caused by the story drift and relatively large axial force caused by the damper force. The axial force can cause earlier yielding and possibly local buckling in the elements, but very limited studies are available on this problem. In addition, because the detailing method of the connection elements such as a gusset plate and stiffeners has not been established, there are a variety of designs including many that are irrational and inadequate. This paper intends to develop a design and analysis method to alleviate such problems. Full-scale test method is developed as an efficient approach and tests are conducted on 10 subassemblies consisting of beam, column, and gusset plate, and the results are analyzed and discussed.

Rotation capacity of I‐shaped beams collapsed with lateral‐torsional buckling under reversed axial forces

“…Figure 5A,B respectively, depicts the loading protocols of the axial force corresponding to Figure 4A,B. As the flexural deformation of the beams prior to the BRB yielding is usually small, 10 it can be assumed that the difference of the damper stiffness has little influence on the ultimate strength and rotation capacity. The loading protocol of the axial force is, thereby, determined as the rigid-plastic hysteresis to model the ideal damper.…”

Estimation of plastic deformation capacity for I‐shaped beams with local buckling under compressive and tensile forces

“…Figure 4 shows the loading protocol of the axial force. Since the damper deformation prior to yielding is usually small, 15 the damper deformation can be considered to indicate that the difference in the damper stiffness gives little influence on the ultimate strength and plastic deformation capacity. The loading protocol of the axial force is, thereby, determined to be the rigid-plastic hysteresis to model the ideal damper.…”