An approximate analysis method is proposed to predict the dynamic amplification of shear forces in ordinary reinforced concrete shear walls as a preliminary study. First, a seismic design for three groups of ordinary reinforced concrete shear walls higher than 60 m was created on the basis of nonlinear dynamic analysis. Causes for the dynamic amplification effect of shear forces were investigated through a detailed evaluation of the nonlinear dynamic analysis result. A new modal combination rule was proposed on the basis of that observation, in which fundamental mode response and combined higher mode response were summed directly. The fundamental mode response was approximated by nonlinear static analysis result, while higher mode response was computed using response spectrum analysis for equivalent linear structural models with the effective stiffness based on the nonlinear dynamic analysis result. The proposed approximate analysis generally predicted vertical distribution of story shear and shear forces of individual walls from the nonlinear dynamic analysis with comparable accuracy.

A B S T R A C T
1. 서 론
2. 해석대상 구조물
    2.1 대상 구조물 특성
    2.2 구조물 설계
    2.3 지반운동 및 스케일링
3. 고차모드에 의한 전단력 증폭 효과
    3.1 전단력 증폭 효과
    3.2 고유치해석 및 응답스펙트럼해석 결과 분석
    3.3 비선형 정적해석 결과 분석
    3.4 기본설계 및 비선형해석에 의한 전단설계 결과비교
4. 증폭된 전단력 예측 방법
    4.1 전단벽의 비선형 응답특성
    4.2 전단력 증폭을 고려한 모드조합
    4.3 유효강성 산정
    4.4 유효강성에 의한 모드응답 변화
5. 전단력 증폭 비교 분석
    5.1 전단벽 구조시스템에 대한 전단력 분포 비교 분석
    5.2 개별 전단벽의 전단력 분포 비교
6. 결 론
REFERENCES

• 전성하(인천대학교 산학협력단) | Jeon Seong-Ha (Industry-Academic Cooperation Foundation, Incheon National University)
• 박지훈(인천대학교 도시건축학부) | Park Ji-Hun (Division of Architecture and Urban Design, Incheon National University) Corresponding author