1998 Fiscal Year Final Research Report Summary
Study on the cumulative out-of-plane deformation of steel beam-culumn subjected to cyclic horizontal and torsional loads
| Project/Area Number |
09650632
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Building structures/materials
|
|---|
| Research Institution | Nagasaki University |
|---|
Principal Investigator |
SHUGYO Minoru Nagasaki Univ., Faculty of Eng., Prof., 工学部, 教授 (70039668)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
LI Jian Ping Nagasaki Univ., Faculty of Eng., Research Assistant, 工学部, 助手 (50274626)
|
|---|
| Project Period (FY) |
1997 – 1998
|
| Keywords | steel beam-column / steel pipe / cyclic behavior / lateral load / out-of-plane deformation / elastoplastic instability / torsion |
|---|
| Research Abstract |
Elastoplastic unstable behavior divergence of cumulative out-of-plane deformation, of a beam-column with hollow circular section subjected to proportional cyclic loading of horizontal and torsional loads under constant. axial force was investigated. Since it. had been clarified by the authors that the lateral force caused by the horizontal displacement of the column top and torsional load is the cause of the unstable behavior the experiments were done by replacing the torsional load with a small constant lateral load.
The experiments were performed using 6 test specimens under the condition tha.t constant lateral force H_2 is 0.1H_y_2 and constant axial force is 0 or 0.3F_y_x or 0.4F_y_x or O.5F_y_x, where H_y_x is the initial yield lateral force and F_y_x is the initial yield axial force of the beam-column.
The results showed that. a remarkable cumulative out-of-plane deformation occures in the beam-column subjected to cyclic horizontal load under a constant lateral load and a constant axial force and it has a tendency to diverge. The numerical method proposed by the authors can predict. the unstable behavior with good accuracy.
|
