• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 1991.10a
• /
• pp.90-95
• /
• 1991

The Uniform Building Code (UBC) is the most widely used requirements for earthquake resistant design in the United States. In this paper, a mid-rise steel building is analyzed by applying 12 sets of actual strong-motion earthquake data that have been scaled to acne 2B levels. The simply extrapolated ground motion displacements are used for the dynamic loads. The results of dynamic analyses for a 10-story steel building are compared with the static and dynamic analysis requirements of UBC-88. It was found that computed lateral fortes using UBC-88 static procedure differed by about 60 percent depending on whether the natural period was computed using the UBC empirical method or the UBC recommended Rayleigh's method. The lateral fortes computed from the UBC response spectra were more than 10 times greater than those computed by UBC static procedures. The lateral forces obtained from both linear and nonlinear analyses using 1989 Loma Prieta ground mot ions compared very well with UBC response spectra results.

• Journal of the Korean Society of Hazard Mitigation
• /
• v.8 no.5
• /
• pp.1-6
• /
• 2008

Most of seismic design code provisions provide the design response spectra for defining design earthquake ground motions. The design spectra in the code provisions generally come under the 5% of critical damping value, which corresponds to the responses of common structure under the design earthquake. Energy dissipation devices and seismic isolation systems became more popular and the design response spectra at higher damping levels are required. Damping coefficients can be effectively used in conversion of 5%-damped design spectra into other damping levels. These coefficients in the current seismic design code provisions are based on the strong ground motion records. Since the weak and moderate earthquake data have different characteristics from those of strong earthquake data, the application of these coefficients should be investigated in the weak and moderate earthquakes zones. In this study, damping coefficients based on the weak and moderate ground motions were developed and compared to those of current seismic design code provisions.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.25 no.2
• /
• pp.149-154
• /
• 2012

While the Earthquake Resistant Design Part of Korean Roadway Bridge Design Code provides design procedures for the No Collapse Requirement, requirements for the Serviceability Limit State are not clearly provided. The basic design method to meet the No Collapse Requirement is the spectrum analysis method using response modification factors and the Serviceability Limit State is determined by both the importance factor and the response modification factor applied in the design procedure. The importance factor can be simply applied according to the bridge importance category, however, in moderate/low seismic regions the application of the response modification factor may bring different result according to design conditions. In this study, for a typical bridge in the moderate/low seismic regions, determination procedures for the Serviceability Limit State are reviewed by carrying out earthquake resistant design and supplementary provisions for the Earthquake Resistant Design Part are identified based on the study results.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.36 no.6
• /
• pp.371-380
• /
• 2023

To calculate seismic fragility, it is important to select input earthquake ground motions that can properly express the characteristics of the target site. This study analyzed the seismic fragility of a single-degree-of-freedom (SDOF) model based on input earthquake ground motions in strong and low-to-moderate seismic regions. As a first step, a total of four sets of input earthquake ground motions were selected,: two sets measured near or far from overseas strong earthquake records and two sets exhibiting the characteristics of low-to-moderate earthquake regions in South Korea. A nonlinear SDOF model for three natural periods was applied to the target structure, and incremental dynamic analysis was used for fragility analysis. In addition, four damage states were defined, and seismic fragility results for each natural period of the nonlinear SDOF model for the four aforementioned input earthquake ground motion sets were obtained for each damage state.

• KLA journal
• /
• v.10 no.10
• /
• pp.27-27
• /
• 1969

본고는 지난 5월 28일부터 30일까지 ‘아카데미 하우스에서 열린 아세아 태평양 지역 도서관 국제회의에 참석하고 귀국한 중국대표 장동철(Mr. Daniel T.C. Chang=대만 국립중앙도서관 부관장)씨가 본 도협 최근만 사무국장 앞으로 보내 온 6월 25일자 대북 ’대화만보‘사설로 게재한 ’간한국저면경자‘의 역이다. 국제회의를 전후로 약 일주일간 서울에 체류하면서 많은 자료를 수집해 간 바 있는 씨는 대한중 도서관계를 위시, 서울의 약진상을 보고 심히 감명하면서 자국민도 한국의 인상에서 다음 여섯 가지 점은 꼭 본받아야 할 것이라고 강조한 바 있다. 다음 글은 동 사설의 내용이다.

• 도로교통
• /
• s.76
• /
• pp.2-7
• /
• 1999

Seismic design in low to moderate seismic regions has to be based on the characteristics of seismic risk, ground motion and structural response in that region. The characteristics of seismic hazard in low to moderate seismic regions are reviewed briefly. The recent findings on the dynamic behavior subjected to the moderate intensity level of ground motion are summarized. The seismic design considerations in Eastern America, China, Australia, Thailand and Hong Kong will be introduced. The effort to adopt the limited ductility design in low to moderate seismicity regions will be reported. Finally research works that are required for the implementation of the limited design concept will be proposed.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2000.04a
• /
• pp.452-457
• /
• 2000

This research aims at evaluating the seismic performance of the existing R/C bridge piers, which were seismically designed in accordance with the provision of moderate confinement design code (Eurocode 8). The work presented in this paper experimentally investigates the ductility and hysteretic behavior of circular reinforced concrete columns with moderate confinement. Pseudo-dynamic tests have been carried out on two scaled R/C column specimens to investigate their hysteretic behavior and other seismic performance.

• Proceedings of the Earthquake Engineering Society of Korea Conference
• /
• 1999.04a
• /
• pp.217-222
• /
• 1999

Seismic design in low to moderate seismic regions has to be based on the characteristics of seismic risk ground motion and structural response in that region. The characteristics of seismic hazard in low to moderate seismic regions are reviewed briefly. The recent findings on the dynamic behavior subjected to the moderate intensity level of ground motion are summarized. The seismic design considerations in Easterm America China Australia Thailand and Hong Kong will be introduced, . The effort to adopt the limited ductility design in low to moderate seismicity regions will be reported. Finally research works that are required for the implementation of the limited design concept will be proposed.

• Journal of the Earthquake Engineering Society of Korea
• /
• v.4 no.3
• /
• pp.99-105
• /
• 2000

한반도 동남부 지역에서 발생하고 관찰된 약진 또는 중진의 자료를 이영하여 이 지역의 Q값과 지진원의 특성인 모서리 주파수 (fc), 응력강하량(Δ$\delta$) 및 모멘크규모 (Mw)를 산정하였다. 가속도 스펙트럼의 경사와 관련된 x의 통계학적 분포로부터 추정한 Q의 95% 신뢰범위는 1656~2454 이다. 1998년 1월 18일 울산 앞바다 지진과 1997년 6월 26일 경주지진의 지진원 요소를 구한 결과 fc 는 각각 4.22Hz , 2.94Hz, Δ$\delta$는 각각 106.8 bar, 106.2 bar, Mw는 각각 3.9, 4.0으로 추정되었다. 제한된 자료수로 인하여 이들의 통계학적 성질을 충분히 규명하지는 못하였지만 다른 연구자들의 기존결과와 유사한 값을 보인다. 본 연구의 결과는 강진동 모사에 직접 이용이 가능하며, 이 지역에 위치한 원자력 발전소 내진 안전성 검토에도 이용될 수 있다.

• Journal of the Earthquake Engineering Society of Korea
• /
• v.4 no.3
• /
• pp.23-34
• /
• 2000

반복하중을 지지하는 4개의 2/3 크리 접합부 실험을 통하여 콘크리트 기둥 및 강재 보로 구성된 골조에 대한 외부 모멘트 접합부의 이력거동을 조사하였다. 주요 실험 변수는 접합부에 배치된 후프근의 수, 콘크리트만의 전단강도 발현응ㄹ 유도한 접합부 상세, 강재 보 플랜지 상, 하부에 스터드 형태의 전단키를 사용한 상세 등이다. 실험 시 관측된 균열양상, 파괴형상 및 다양한 계측결과에 근거하여 접합부 상세에 따른 각 시험체의 거동이 자세히 기술되었으며, 항복 후 보유강도, 강성저하 정도 및 에너지 소산능력 등이 분석되었다. 실험결과에 의하면, 이들 중 패널 및 인접 기둥 영역에 각각 2개의 후프근을 갖는 시험체 (CF3) 가 가장 우수한 이력응답을 나타냈으며, 이러한 형태의 접합부 상헤는 우리나와 같은 약진 지역에 적합할 것으로 판단되었다.