Capacity Requreiment of Steel Moment Frames in Compliance with Seismic Demand
| Project/Area Number |
11650590
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Building structures/materials
|
|---|
| Research Institution | Kumamoto University |
|---|
Principal Investigator |
OGAWA Koji Kumamoto University, Faculty of Engineering, Professor, 工学部, 教授 (80112390)
|
|---|
| Project Period (FY) |
1999 – 2000
|
| Project Status |
Completed (Fiscal Year 2000)
|
| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2000: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1999: ¥2,400,000 (Direct Cost: ¥2,400,000)
|
|---|
| Keywords | seismic design / steel moment frame / earthquake input energy / fishbone-shaped frame / equivalent SDOF / maximum seismic response / residual deformation / ductility demand / 最大変位 / 累積塑性変形 / 梁降伏型 |
|---|
| Research Abstract |
The results obtained from this project are summarized as follows :
1. Damage-causing earthquake input energy used in energy-based seismic design is defined as the maximum response of the sum of elastic strain energy and plastic dissipated energy. The input energy can be predicted by using a pseudo-velocity response spectrum corresponding to the apparent natural period of a frame, which is determined based on the mean of the plastic dissipated energy per half-cycle in the whole vibration.
2. Maximum half-cycle energy input ratio is defined as the ratio of the maximum increment of the sum of elastic strain energy and plastic dissipated energy during a half-cycle of vibration to the damage-causing earthquake input energy. The maximum half-cycle energy input ratio is evaluated by extensive numerical response analysis. A method is proposed to predict the maximum seismic response and residual deformation of bilinear systems based on the balance between input energy and absorbed energy during a
… More
half-cycle of vibration.
3. An equivalent single-degree-of-freedom system is proposed that can simulate the seismic response of a multistory frame. A method for predicting the collapse mechanism under earthquake excitations is devised, taking into consideration the correlation between dynamic horizontal forces acting on each story. In addition, load-deformation relationships of equivalent single-degree-of-freedom systems are determined based on the predicted collapse mechanism.
4. A seismic design procedure is proposed to estimate the ductility demanded of beams in strong-column/weak-beam steel frames. Critical parameters that control the earthquake response of steel frames are characterized and incorporated into the equivalent single-degree-of-freedom representation. Maximum and cumulative plastic rotations induced into beam-ends are derived in explicit forms as functions of these parameters, and the accuracy of the estimated rotations is demonstrated through comparison with numerical results. Less
|
Report
(3 results)
Research Products
(27 results)
