• Title/Summary/Keyword: Earthquake Measures

Search Result 152, Processing Time 0.025 seconds

Damages, Human Behaviour and Recovery of Urban Residents in the 2005 West off Fukuoka Earthquake

  • Murakami, H.
    • 한국방재학회:학술대회논문집
    • /
    • 2008.02a
    • /
    • pp.13-18
    • /
    • 2008
  • The 2005 west off Fukuoka earthquake with Mjma 7.0 occurred in the vicinity of Fukuoka city with 1.4 million populations, which had been regarded as rather seismically inactive in Japan. The strong motion records by K-net indicated PGV of 64 cm/s in Fukuoka city and some condominium buildings sustained extensive non-structural damages. In this study, we conducted a questionnaire survey for residents of 8 condominium buildings located in the downtown area of Fukuoka city after the earthquake. The results indicate that damaged nonstructural walls and distorted doors disrupted evacuation route for many occupants, and furniture and content damage on upper floors became severer resulting in higher rates of human casualty. Earthquake preparedness for indoor safety was raised after the earthquake, though further safety measures can be advised. In the phase of post-earthquake emergency and restoration period, residents' management organizations play important roles, so that neighborhood activities to promote communication networks are important in urban environment with aging population.

  • PDF

Probabilistic seismic demand of isolated straight concrete girder highway bridges using fragility functions

  • Bayat, Mahmoud;Ahmadi, Hamid Reza;Kia, Mehdi;Cao, Maosen
    • Advances in concrete construction
    • /
    • v.7 no.3
    • /
    • pp.183-189
    • /
    • 2019
  • In this study, it has been tried to prepare an analytical fragility curves for isolated straight continues highway bridges by considering different spectral intensity measures. A three-span concrete isolated bridge has been selected and the seismic performance of the bridge has been improved by Lead Rubber Bearing (LRB). Incremental Dynamic Analysis (IDA) is applied to the bridge in longitudinal direction. A suite of 14 earthquake ground motions from medium to sever motions are scaled and used for nonlinear time history analysis. Fragility function considers the relationship of earthquake intensity measures (IM) and probability of exceeding certain Damage State (DS). A full three dimensional finite element model of the isolated bridge has been developed and analyzed. A wide range of different intensity measures are selected and the optimal intensity measure which has the less dispersion is proposed.

Development of a Seismic Damage Assessment Program for NPP Containment Structure (원전격납건물 지진피해평가 프로그램 개발)

  • 고현무;신현목;최강룡;정대열;현창헌;조호현;김태훈
    • Proceedings of the Earthquake Engineering Society of Korea Conference
    • /
    • 2003.03a
    • /
    • pp.118-125
    • /
    • 2003
  • Seismic damage assessment program for containment structure is developed. The program has been established through the combination of inelastic seismic analysis program and 3-D animation program. Damage indices at finite element level and structural level have been introduced for the seismic damage assessment. The seismic damage assessment program makes it possible to analyze in real-time the actual resistance capacity and damage level of containment structure. It will be expected that the program enables to establish the measures more quickly under the earthquake event.

  • PDF

A Study on Improvement Plans of Earthquake Disaster Safety Management in National Industrial Complexes (국가산업단지 지진재난 안전관리 개선방안 연구)

  • Song, Chang Young;Lee, Dae Jin
    • Journal of Korean Society of Disaster and Security
    • /
    • v.13 no.3
    • /
    • pp.1-14
    • /
    • 2020
  • The purpose of this study is to identify the problems of the earthquake disaster safety management in the national industrial complexes and to suggest improvement counter-measure. Literature review for the safety management system of the Korea Industrial Complex Corporation and interview with practitioners was conducted. and Seismic design application survey was conducted on 28 national industrial complexes. In order to improve Earthquake Disaster Safety Management, Counter-measures were suggested such as the reinforcement of laws and regulations related Seismic. It is expected that the improvement counter-measures presented in this study can be used as policy-making data for improving the seismic performance of the national industrial complexes in the future.

Post-earthquake fire performance-based behavior of reinforced concrete structures

  • Behnama, Behrouz;Ronagh, Hamid R.
    • Earthquakes and Structures
    • /
    • v.5 no.4
    • /
    • pp.379-394
    • /
    • 2013
  • Post-earthquake fire (PEF) can lead to a rapid collapse of buildings damaged partially as a result of prior earthquake. Almost all standards and codes for the design of structures against earthquake ignore the risk of PEF, and thus buildings designed using those codes could be too weak when subjected to a fire after an earthquake. An investigation based on sequential analysis inspired by FEMA356 is performed here on the Immediate Occupancy, Life Safety and Collapse Prevention performance levels of structures, designed to the ACI 318-08 code, after they are subjected to an earthquake level with PGA of 0.35g. This investigation is followed by a fire analysis of the damaged structures, examining the time taken for the damaged structures to collapse. As a point of reference, a fire analysis is also performed for undamaged structures and before the occurrence of earthquake. The results indicate that the vulnerability of structures increases dramatically when a previously damaged structure is exposed to PEF. The results also show that the damaging effects of post-earthquake fire are exacerbated when initiated from the second and third floor. Whilst the investigation is made for a certain class of structures (conventional buildings, intermediate reinforced structure, 3 stories), the results confirm the need for the incorporation of post-earthquake fire into the process of analysis and design, and provides some quantitative measures on the level of associated effects.

Methodology for investigating the behavior of reinforced concrete structures subjected to post earthquake fire

  • Behnam, Behrouz;Ronagh, Hamid R.;Baji, Hassan
    • Advances in concrete construction
    • /
    • v.1 no.1
    • /
    • pp.29-44
    • /
    • 2013
  • Post earthquake fire (PEF) can lead to the collapse of buildings that are partially damaged in a prior ground-motion that occurred immediately before the fire. The majority of standards and codes for the design of structures against earthquake ignore the possibility of PEF and thus buildings designed with those codes could be too weak when subjected to a fire after an earthquake. An investigation based on sequential analysis inspired by FEMA356 is performed here on the Life-Safety performance level of structures designed to the ACI 318-08 code after they are subjected to two different earthquake levels with PGA of 0.35 g and 0.25 g. This is followed by a four-hour fire analysis of the weakened structure, from which the time it takes for the weakened structure to collapse is calculated. As a benchmark, the fire analysis is also performed for undamaged structure and before occurrence of earthquake. The results show that the vulnerability of structures increases dramatically when a previously damaged structure is exposed to PEF. The results also show the damaging effects of post earthquake fire are exacerbated when initiated from second and third floor. Whilst the investigation is for a certain class of structures (regular building, intermediate reinforced structure, 3 stories), the results confirm the need for the incorporation of post earthquake fire in the process of analysis and design and provides some quantitative measures on the level of associated effects.

A Study on Risk Mitigation Measures of NaTech Damage Effect of Hazardous Chemical Storage Tank - Focus on Triggered by Earthquake - (화학물질 저장탱크의 NaTech 피해영향 저감방법 연구 - 지진으로 인한 사고 중심으로 -)

  • Lee, Tae-Hyung;Lee, Hyun-Seung;Yoo, Byung-Tae
    • Journal of the Korean Institute of Gas
    • /
    • v.22 no.5
    • /
    • pp.79-88
    • /
    • 2018
  • This study presents an evaluation method to estimate the damage scale of chemical storage tank of petrochemical plant due to the earthquake that is likely to occur among NaTech damage types. Based on this, the risk for damage reduction of chemical storage tanks was evaluated. As a result of the study, the risk of the storage tank increased greatly considering the earthquake, and the risk was greatly reduced as a result of evaluating the proposed measures to mitigate the damage impact on the earthquake. This study is expected to contribute to the research on the reduction of NaTech damages such as typhoons and thunderstorms as well as earthquakes, and to establish an emergency response plan. In the future, it is necessary to systematically study and institutionalize the risk reduction measures considering earthquakes.

The Dynamic Behavior of Earthquake-Actuated Automatic Gas Shutoff Devices (자동 가스차단 밸브의 동적 거동)

  • 이동근;김태호;안상경;임용재
    • Proceedings of the Earthquake Engineering Society of Korea Conference
    • /
    • 2001.04a
    • /
    • pp.468-475
    • /
    • 2001
  • It can be seen through the previous earthquake damages that indirect damages such as those by fire are much greater rather than direct (firsthand) damage by earthquakes. Recently, gas is used very popularly all over the country but no measures have been taken against hazards (or dangers), for instance, such as fires caused by leaking gas pipes when earthquakes occur. Earthquake-Actuated Automatic Gas Shutoff Devices (Shutoff Device) are used to prevent such disaster in other countries. ChungJung Engineering. Co. is making a sample of a Shutoff Device for the first time in Korea. In this study, a derivation of mathermatical model and the important effects of various variables on the shutoff device are mentioned.

  • PDF

Finite element simulation of traditional and earthquake resistant brick masonry building under shock loading

  • Daniel, A. Joshua;Dubey, R.N.
    • Coupled systems mechanics
    • /
    • v.4 no.1
    • /
    • pp.19-36
    • /
    • 2015
  • Modelling and analysis of a brick masonry building involves uncertainties like modelling assumptions and properties of local material. Therefore, it is necessary to perform a calibration to evaluate the dynamic properties of the structure. The response of the finite element model is improved by predicting the parameter by performing linear dynamic analysis on experimental data by comparing the acceleration. Further, a nonlinear dynamic analysis was also performed comparing the roof acceleration and damage pattern of the structure obtained analytically with the test findings. The roof accelerations obtained analytically were in good agreement with experimental roof accelerations. The damage patterns observed analytically after every shock were almost similar to that of experimental observations. Damage pattern with amplification in roof acceleration exhibit the potentiality of earthquake resistant measures in brick masonry models.

Examination of the effects on earthquake behavior and rough construction costs of short column situation occurring in reinforced concrete buildings

  • Gursoy, Senol;Cavusoglu, Aykut
    • Earthquakes and Structures
    • /
    • v.20 no.3
    • /
    • pp.309-323
    • /
    • 2021
  • Architectural design decisions and structural systems arrangements affect their earthquake behaviors significantly of reinforced concrete building in Turkey. Because the performances as safe and economical against earthquake loads of reinforced concrete buildings can be provided with especially design decisions in the architectural design stage. This matter reveals the importance of design decisions in the architectural design phase and the right structural system arrangement. The purpose of this study, the short-column situation frequently observed in reinforced concrete buildings after the earthquakes occurred in Turkey are to examine comparatively the effects on behavior and the rough construction cost of the building. The obtained results show that the short column circumstance composed due to different reasons negatively affects the earthquake performance of the reinforced concrete buildings and increases the rough construction cost. This matter shows that the measures to be taken against short column formation should be foreseen especially at the architectural design stage.