근거리 및 원거리 지진에 대한 비선형 구조물의 강도감소계수 산정 = Estimation of Strength Reduction Factor for Nonlinear Structural System subjected to Near Field and Far Field Earthquakes

국문 초록 (Abstract)

강도감소계수는 탄성설계 스펙트럼으로부터 비탄성 설계스펙트럼을 작성하는데 사용되며, 구조물이 가진 연성도 능력 한도 내에서 비탄성 거동을 허용함으로써 설계강도를 어느 정도 낮출 수 있는지를 나타내는 척도이다. 기존의 많은 연구자들이 제안한 강도감소계수 제안식은 대부분 탄소성 모델과 제한적인 지진하중에 대하여 작성되었다. 그러므로 본 연구에서는 강도감소계수에 관한 계산식의 활용성 및 유용성을 증대시키기 위하여, 근거리 및 원거리 지진으로 구분되는 총 80개 지진가속도 기록을 사용하여 강도감소계수를 평가하였으며, 구조물의 비탄성 이력거동은 이선형 및 강성저하 모델로 구분하여 적용할 수 있는 강도감소계수를 제안하였다. 또한 강도감소계수에 대한 변위연성도, 항복후 강성비, 구조물의 주기, 비탄성 이력모델과 지진 특성의 영향을 분석하였다. 본 연구에서 제안한 강도감소계수의 정확성은 기존의 제안식과 비탄성 응답스펙트럼 해석에 의해 계산된 강도감소계수와의 비교에 의하여 평가하였다.

다국어 초록 (Multilingual Abstract)

Strength reduction factor is used to estimate inelastic strength demands from elastic strength demands. The strength reduction factor represents a reduction degree of design strength by permitting inelastic behaviors within the limited ductility capacity. Most of existing formulas for strength reduction factor were mainly constructed for the elasto-plastic model and limited numbers of earthquake records. In order to improve application and usefulness of simple formula for the strength reduction factor, two hysteretic models and 80 earthquake records are used in the inelastic response spectrum analysis. Two hysteretic models used are the bilinear and stiffness degrading models. In order to reflect characteristics of earthquakes, the 80 earthquake records are classified into two groups of 40 far-field and 40 near-field earthquake records. The effects of several parameters such as displacement ductility, strain hardening ratio, period, characteristics of earthquakes and hysteretic models for the strength reduction factor are evaluated. Accuracy of the proposed formula is evaluated by comparing the strength reduction factors estimated by existing and proposed formulas with those calculated from inelastic response spectrum analysis.

목차 (Table of Contents)

• Abstract
• 요지
• 1. 서론
• 2. 강도감소계수와 요구도 스펙트럼의 관계
• 3. 비탄성 이력응답 및 지진특성을 반영한 강도감소계수의 제안
• 4. 결론
• 감사의 글
• 참고문헌

참고문헌 (Reference)

1 "한국전산구조공학회 구조물의 내진설계" 제15회 전산구조공학회 기술강습회.

2 "역량스펙트럼 방법을 이용한 교량의 내진성능 평가" 대한토목학회 22 (22): 1011-1021, 2002

3 "등가단자유도 방법의 영향을 고려한 다경간 교량의 내진성능 평가를 위한 비탄성 정적해석" 대한토목학회 26 (26): 473-484, 2006

4 "도로교설계기준." 2005

5 "and Cd factors for building seismic provisions Journal of Structural Engineering" 117 : 1991

6 "a nonlinear spectral analysis program that performs bi-direction dynamic time-history analysis of pendulum system. University of California at Berkeley."

7 "Structural Response Modification Factors, ATC-19 Report," Redwood city, California. 1995

8 "Statistical analysis of the response of nonlinear systems subjected to earthqukes Dept. of Civ. Engrg. University of Illinois" 1979

9 "Spectral displacement demands of stiffness and strength degrading systems" 16 (16): 817-851, 2002

10 "Simplified response-spectrum seismic analysis of nonlinear structures" 122 (122): 282-285, 1996

11 "Seismic evaluation and retrofit of concrete buildings-volume 1 (ATC 40). Report No. SSC 96-01" Redwood City (CA), USA 1996

12 "Seismic design criteria for nuclear reactor facilities Building Practices for Disaster Mitigation National Bureau of Standards U.S. Department of Commerce" 209-236, 1973

13 "Seismic design based on ductility and cumulative damage demands and capacities Nonlinear Seismic Analysis and Design of Reinforced Concrete Buildings" 1992

14 "Seismic design and retrofit of bridges" John Wiley & Sons, Inc. 1996

15 "Seismic demands for SDOF and MDOF systems" The John A. Blume Earthquake Engineering Center Stanford University 1991

16 "Response modification factors for earthquake resistant design of short period structures" 5 : 571-590, 1989

17 "Prestandard and commentary for the seismic rehabilitation of buildings (FEMA 356), Washington, DC, USA" 2000

18 "Performance based assessment-from general methodologies to specific implementations" 2004

19 "New Chilean code for earthquake-resistant design of buildings" 2 : 927-936, 1990

20 "NEHRP guidelines for the seismic rehabilitation of buildings (FEMA 273), and NEHRP commentary on the guidelines for the seismic rehabilitation of buildings (FEMA 274)" Washington (DC): Building Seismic Safety Council 1997

21 "J. of Struct. Engrg." 119 : 1993

22 "Inelastic response spectra for aseismic building design" 106 : 1295-1310, 1980

23 "Improvement of nonlinear static seismic analysis procedures (FEMA 440), ATC-55 Project" Redwood city, California, USA 2004

24 "IDARC-BRIDGE : a computational platform for seismic damage assessment of bridge structures" 1998

25 "Evaluation of strength reduction factors for earthquake resistant design" 10 : 357-379, 1994

26 "Estimation of system-level ductility demands for multi-story structures" 19 (19): 1025-1035, 1997

27 "Displacement-based seismic design of multi-degree-of-freedom bridge structures" 24 : 1247-1266, 1995

28 "Development of ground motion time histories for phase 2 of the FEMA/SAC steel project" 1997

29 "Capacity-demand-diagram methods for estimating seismic deformation of inelastic structures: SDF systems" 1999

30 "A simplified nonlinear method for seismic evaluation of RC bridges" 1998

31 "A procedure for determining consistent inelastic design spectra Proc. Workshop on Nonlinear Seismic Analysis of RC Structures" 1992

32 "A nonlinear analysis method for performance based seismic design" 16 (16): 573-592, 2000