TUTUM Easy-seismic: 소방시설 내진설계 자동화 소프트웨어 개발

오창수,최준호 한국화재소방학회 2019 한국화재소방학회논문지 Vol.33 No.5

‘소방시설 내진설계 의무화’에 발맞추어 내진설계의 신뢰성과 효율성 향상을 위해서는 설계 자동화 소프트웨어개발이 필수불가결하다. 본 연구에서 개발한 내진 설계 자동화 S/W는 소방청의 「소방시설의 내진설계 기준(이하 “국내 기준”)」에 따른 흔들림 방지 버팀대(이하 “버팀대”)의 자동 배치, 계산서 출력 및 그리고 물량 자동 산출 등의 기능을 제공한다. 또한, 자동화 S/W는 설계자의 수동설계와 비교하였을 때 약 3배 정도의 업무 속도를 단축시켜줄 뿐만 아니라 버팀대 등의 설계물량과 관련한 휴먼에러를 줄임으로써 설계안의 신뢰성을 높여준다. 뿐만 아니라 그동안보수적으로 접근했던 소방시설의 내진설계방식에 있어 적어도 버팀대 사용에 대해서 컴퓨터 알고리즘을 이용한 최적의 내진설계를 수행할 수 있었다. In line with the “mandatory seismic design of fire protection facilities,” development of design automation software isindispensable for improving the reliability and efficiency of seismic design. The seismic design automation softwaredeveloped in this study is an automated S/W for seismic design of fire-fighting facilities, and functions such as automaticarrangement of anti-shake braces according to Korea National Fire Agency's Seismic Design Standards for fire-fightingfacilities, output of seismic bracing calculation bills and automatic quantities counting. In addition, the seismic designautomation software not only reduces the work speed by three times compared to the manual design of the designer, butalso improves the reliability of the design by reducing the human error related to the design quantity such as the brace. In addition, in the seismic design method of fire protection facilities that have been approached conservatively, it waspossible to perform the optimal seismic design by using computer algorithms for at least in the use of braces.

계측 지진파 기반 설계응답스펙트럼에 상응하는 설계 지진파 시간이력 생성 기법 개발

오현주(Oh, Hyun Ju),박형춘(Park, Hyung Choon) 대한토목학회 2021 대한토목학회논문집 Vol.41 No.6

최근 국내에서 큰 규모의 지진이 발생하게 되면서 내진설계의 중요성이 크게 증가하였다. 내진설계기준에서는 중요구조물 또는 특수구조물에 대해서는 동적시간이력해석을 수행하도록 규정하고 있다. 이러한 중요 또는 특수 구조물의 내진해석 및 설계에 있어 합리적 설계 입력 지진파를 결정하는 것은 해석 및 설계의 신뢰도를 확보하는데 매우 중요한 요소이다. 내진설계기준에서 합리적 설계 지진파는 해당 지역(단층)의 특성을 반영하면서 동시에 내진 성능 수준별 설계응답스펙트럼을 만족해야 한다. 이러한 요구조건은 해당 지역(단층)에서 계측됐던 실 지진파를 설계응답스펙트럼에 상응하게 수정하여 부분적으로 만족시킬 수 있다. 본 연구에서는 하모닉웨이브릿변환(Harmonic Wavelet Transform)을 이용하여 실 계측 지진파를 기반으로 설계응답스펙트럼에 상응하게 지진파시간이력 수정 · 생성 하는 방법을 제안하였다. 제안한 기법의 적용성 검토를 위해 경주(2016년)와 포항(2017년)에서 발생했던 각 규모 5.8과 5.4의 지진에 제안된 기법을 적용하여 설계응답스펙트럼에 상응한 지진파시간이력을 수정 · 생성 하였다. With the recent occurrence of large-scale earthquakes in Korea, the importance of seismic design has greatly increased. Seismic design standards stipulate that dynamic time history analysis be performed for important or special structures. In the seismic analysis and design of such structures, determining a rational design input seismic wave is a very important factor in ensuring the reliability of the analysis and design. In the seismic design standards, rational design seismic waves must reflect the characteristics of the area (fault) and satisfy the design response spectrum for each seismic performance level. This requirement can be partially satisfied by modifying the actual seismic wave measured in the area (fault) according to the design response spectrum. In this study, a method of correcting and generating seismic wave time histories according to the design response spectrum based on actual measured seismic waves using the harmonic wavelet transform was proposed. To examine the applicability of the proposed technique, the technique was applied to earthquakes of magnitude 5.8 and 5.4, respectively, that occurred in Gyeongju (2016) and Pohang (2017), and the seismic wave time histories corresponding to the design response spectrum were modified and generated.

설계스펙트럼의 개정에 따른 철근콘크리트 보통모멘트골조의 내진성능수준 평가

심정은,김준희 한국지진공학회 2022 한국지진공학회논문집 Vol.26 No.5

New buildings have been designed using different seismic design standards that have been revised. However, the seismic performance of existing buildings is evaluated through the same performance evaluation guidelines. Existing buildings may not satisfy the performance targets suggested in the current guidelines, but there are practical limitations to discriminating the existing buildings with poor seismic performance through a full investigation. In this regard, to classify buildings with poor seismic performance according to the applied standard, this study aimed to evaluate performance-based investigation of the seismic design proposals of buildings with different design standards. The target buildings were set as RC ordinary moment frames for office occupancy. Changes in seismic design criteria by period were analyzed, and the design spectrum changes of reinforced concrete ordinary moment resisting frames were compared to analyze the seismic load acting on the building during design. The seismic design plan was derived through structural analysis of the target model, compared the member force and cross-sectional performance, and a preliminary evaluation of the seismic performance was performed to analyze the performance level through DCR. As a result of the seismic performance analysis through the derived design, the reinforced concrete ordinary moment frame design based on AIK 2000 has an insufficient seismic performance level, so buildings built before 2005 are likely to need seismic reinforcement.

방파제의 성능기반 내진설계법

김영준,박인준 한국지반공학회 2022 한국지반공학회논문집 Vol.38 No.12

The 1995 Kobe earthquake caused a massive damage to the Port of Kobe. Therefore, it was pointed out that it was impossible to design port structures for Level II (Mw 6.5) earthquakes with quasi-static analysis and Allowable Stress Design methods. In Japan and the United States, where earthquakes are frequent, the most advanced design standards for port facilities are introduced and applied, and the existing seismic design standards have been converted to performance-based design. Since 1999, the Korean Port Seismic Design Act has established a definition of necessary facilities and seismic grades through research on facilities that require seismic design and their seismic grades. It has also established a performance-based seismic design method based on experimental verification. In the performance-based seismic design method of the breakwater proposed in this study, the acceleration time history on the surface of the original ground was subjected to a fast Fourier transform, followed by a filter processing that corrected the frequency characteristics corresponding to the maximum allowable displacement with respect to performance level of the breakwater and the filtered spectrum. The horizontal seismic coefficient for the equivalent static analysis considering the displacement was calculated by inversely transforming (i.e., subjected to an inverse fast Fourier transform) into the acceleration time history and obtaining the maximum acceleration value. In addition, experiments and numerical analysis were performed to verify the performance-based seismic design method of breakwaters suitable for domestic earthquake levels.

Seismic Design of Bridges in Low to Moderate Seismic Zones

Kook Seung Kyu 한국지진공학회 1998 한국지진공학회논문집 Vol.2 No.3

For the seismic design of bridges in Korea classified as the low to moderate seismic zones, the design concepts provided in the Standard Specification for Highway Bridges, Division I-A: Seismic Design, are adopted, which is basically developed for the strong seismic zones by AASHITO. Accordingly, the design procedures provided for the low to moderate seismic zones are simplified too much to fulfill the purpose of the seismic design. In this paper the design procedures given for the low to moderate seismic zones in the Standard are summarized and discussed in view of the seismic design purpose. From the discussion results some revisions are proposed as conclusions for the reasonable a, pp.ication of the Standard for bridges located in the low to moderate seismic zones.

A SEISMIC DESIGN OF NUCLEAR REACTOR BUILDING STRUCTURES APPLYING SEISMIC ISOLATION SYSTEM IN A HIGH SEISMICITY REGION -A FEASIBILITY CASE STUDY IN JAPAN

Kubo, Tetsuo,Yamamoto, Tomofumi,Sato, Kunihiko,Jimbo, Masakazu,Imaoka, Tetsuo,Umeki, Yoshito Korean Nuclear Society 2014 Nuclear Engineering and Technology Vol.46 No.5

A feasibility study on the seismic design of nuclear reactor buildings with application of a seismic isolation system is introduced. After the Hyogo-ken Nanbu earthquake in Japan of 1995, seismic isolation technologies have been widely employed for commercial buildings. Having become a mature technology, seismic isolation systems can be applied to NPP facilities in areas of high seismicity. Two reactor buildings are discussed, representing the PWR and BWR buildings in Japan, and the application of seismic isolation systems is discussed. The isolation system employing rubber bearings with a lead plug positioned (LRB) is examined. Through a series of seismic response analyses using the so-named standard design earthquake motions covering the design basis earthquake motions obtained for NPP sites in Japan, the responses of the seismic isolated reactor buildings are evaluated. It is revealed that for the building structures examined herein: (1) the responses of both isolated buildings and isolating LRBs fulfill the specified design criteria; (2) the responses obtained for the isolating LRBs first reach the ultimate condition when intensity of motion is 2.0 to 2.5 times as large as that of the design-basis; and (3) the responses of isolated reactor building fall below the range of the prescribed criteria.

일본 원전 내진설계 기술기준을 적용한 모의지진파(가속 도시간이력) 작성

진승민,김용복,이용선,문일환 한국지진공학회 2021 한국지진공학회논문집 Vol.25 No.2

Seismic designs for Korean nuclear power plants (NPPs) under earthquakes’ design basis are noticed due to the recent earthquake events in Korea and Japan. Japan has developed the technologies and experiences of the NPPs through theoretical research and experimental verification with extensively accumulated measurement data. This paper describes the main features of the design-time history complying with the Japanese seismic design standard. Proper seed motions in the earthquake catalog are used to generate one set of design time histories. A magnitude and epicentral distance specify the amplitude envelope function configuring the shape of the earthquake. Cumulative velocity response spectral values of the design time histories are compared and checked to the target response spectra. Spectral accelerations of the time histories and the multiple-damping target response spectra are also checked to exceed. The generated design time histories are input to the reactor building seismic analyses with fixed-base boundary conditions to calculate the seismic responses. Another set of design time histories is generated to comply with Korean seismic design procedures for NPPs and used for seismic input motions to the same reactor containment building seismic analyses. The responses at the dome apex of the building are compared and analyzed. The generated design time histories will be also applied to subsequent seismic analyses of other Korean standard NPP structures.

지진격리교량과 강재받침교량의 연성파괴메커니즘에 의한 비교내진설계

국승규(Kook Seung Kyu) 대한토목학회 2006 대한토목학회논문집 A Vol.26 No.1A

지진격리교량은 내진설계가 도입된 이후 실무에서 많이 설계, 시공되고 있으나 현재 실무에서 제시하고 있는 설계결괴는 불필요하게 높은 기능수행수준과 취성파괴메커니즘으로 내진설계개념에 부합하는 설계라 할 수 없다. 이는 기존의 설계관행인 하부구조의 과다한 강성과 내진설계방식의 인식부족에 기인한 것이다. 이 연구에서는 기존의 설계관행에 의해 설계된 지진격리교량을 선정하고, 통일한 교량에 격리받침 대신 강재받침을 사용한 강재받침교량을 설정하여 비교내진설계를 수행하였으며, 이로부터 내진설계에서 요구되는 성능수준을 확보하기 위한 각 교량의 내진설계절차를 제시하였다. 강재받침교량에 비해 지진격리교량은 시산법과 반복해석을 적용해야 하는 복잡한 설계절차가 요구되는 반면 상대적으로 높은 기능수행수준을 제공한다는 것을 확인하였다. 그러나 강재받침교량도 하부구조 강성을 조정하면 요구되는 기능수행수준을 만족할 수 있으므로, 연성파괴메커니즘의 확보가 불가능한 경우 지진격리교량을 대안설계로 고려하는 것이 합리적인 내진설계과정이라는 것을 제시하였다. Many isolated bridges are designed and constructed after the introduction of the seismic design. However those bridges designed in engineering fields have unnecessarily high serviceability limit and brittle failure mechanism, which do not satisfy the seismic design concept. Such design results are due to the excessive substructure stiffness of the conventional design method as well as the misunderstanding of the seismic design method. In this study an isolated bridge designed with the conventional design method is selected and the same bridge with steel bearings is modelled for the comparative seismic design. From the comparison, the seismic design procedures satisfying the required performance levels are provided for the two bridges. It is confirmed that the isolated bridge requires more complicated design procedure with trial and error methods and reanalyses but provides higher serviceability limit compared to the bridge with steel bearings. However, because the required serviceability limit can also be obtained by adjusting substructure stiffness, it is a resonable seismic design process that an isolated bridge is to be considered as an alternative design when the ductile failure mechanism is not obtained with a bridge with steel bearings.

플랜트 설비 지지용 대안 강구조 시스템의 내진성능

곽병훈,안숙진,박지훈 한국지진공학회 2023 한국지진공학회논문집 Vol.27 No.1

In this study, alternative seismic force-resisting systems for plant structure supporting equipment were designed, and the seismic performance thereof was compared using nonlinear dynamic analysis. One alternative seismic force-resisting system was designed per the requirement for ordinary moment-resisting and concentrically braced frames but with a reduced base shear. The other seismic force-resisting system was designed by accommodating seismic details of intermediate and unique moment-resisting frames and special concentrically braced frames. Different plastic hinge models were applied to ordinary and ductile systems based on the validation using existing test results. The control model obtained by code-based flexible design and/or reduction of base shear did not satisfy the seismic performance objectives, but the alternative structural system did by strengthened panel zones and a reduced effective buckling length. The seismic force to equipment calculated from the nonlinear dynamic analysis was significantly lower than the equivalent static force of KDS 41 17 00. The comparison of design alternatives showed that the seismic performance required for a plant structure could be secured economically by using performance-based design and alternative seismic-force resisting systems adopting minimally modified seismic details.

A Seismic Design of Nuclear Reactor Building Structures Applying Seismic Isolation System in a High Seismicity Region –A Feasibility Case Study in Japan-

TETSUO KUBO,TOMOFUMI YAMAMOTO,KUNIHIKO SATO,MASAKAZU JIMBO,TETSUO IMAOKA,YOSHITO UMEKI 한국원자력학회 2014 Nuclear Engineering and Technology Vol.46 No.5

A feasibility study on the seismic design of nuclear reactor buildings with application of a seismic isolation systemis introduced. After the Hyogo-ken Nanbu earthquake in Japan of 1995, seismic isolation technologies have been widelyemployed for commercial buildings. Having become a mature technology, seismic isolation systems can be applied toNPP facilities in areas of high seismicity. Two reactor buildings are discussed, representing the PWR and BWR buildingsin Japan, and the application of seismic isolation systems is discussed. The isolation system employing rubber bearingswith a lead plug positioned (LRB) is examined. Through a series of seismic response analyses using the so-named standarddesign earthquake motions covering the design basis earthquake motions obtained for NPP sites in Japan, the responsesof the seismic isolated reactor buildings are evaluated. It is revealed that for the building structures examined herein: (1)the responses of both isolated buildings and isolating LRBs fulfill the specified design criteria; (2) the responses obtainedfor the isolating LRBs first reach the ultimate condition when intensity of motion is 2.0 to 2.5 times as large as that of thedesign-basis; and (3) the responses of isolated reactor building fall below the range of the prescribed criteria.