|
Title |
Shear Force Amplification Effect Addressing Nonlinear Dynamic Response in Slender RC Walls
|
|
Authors |
김성현(Sung Hyun Kim) ; 황현종(Hyeon-Jong Hwang) ; 박홍근(Hong-Gun Park) |
|
DOI |
https://doi.org/10.4334/JKCI.2018.30.2.135 |
|
Keywords |
세장한 철근콘크리트 벽 ; 성능기반내진설계 ; 비선형 전단력 증폭효과 ; 전단력 분포 ; 고차모드효과 Slender RC wall ; Performance based seismic design ; Shear force amplification effect ; Shear force distribution ; Higher mode effect |
|
Abstract |
In performance-based seismic design of slender RC walls, a nonlinear time history analysis generates larger shear force demand than the shear force demand calculated by an elastic modal analysis. In order to investigate the factors that contribute to the dynamic shear amplification effect, a parametric study was performed by considering four parameters: total number of stories, fundamental period, flexural over-strength ratio, and soil condition. A nonlinear time history analysis was carried out by using 20 different ground motions. The results showed that the total number of stories and flexural over-strength ratio were the main contributors to the shear amplification of slender RC walls. Hence, an equation for evaluating the base shear amplification factor was proposed in terms of these two main parameters. A shear distribution model was also proposed by incorporating multiple modal shapes of RC walls in the elastic motion and in the damaged motion after yielding of reinforcing bars in the walls. The proposed method showed better estimation for evaluating the shear amplification factor and shear force distribution under a severe seismic excitation.
|