Pub Date : 2023-12-31DOI: 10.9798/kosham.2023.23.6.279
Kang Taewook, Jiuk Shin, Dong-gyu Kim, Jaedo Kang
The Pohang earthquake raised concerns about the potential occurrence of fire-following earthquake (FFE). The United States and Japan effectively manage FFE risks through ignition and fire-burned ratio assessments. This study introduced a streamlined method for assessing FFE risk by leveraging a public building database (e.g., building registration data). The proposed method was applied to the Pohang regions. Hence, the ignition and fire spread calculation methods employed in the United States and Japan were adapted to suit the domestic database. The method was then implemented in clusters identified in the Pohang region. The fire-burned ratios, accompanied by the covering volume fraction (CVF) for each cluster, were computed using the extracted and newly developed building information. This method was used to evaluate the FFE risks in the Pohang areas.
{"title":"Developing Cluster-based Fire Following Earthquake Risk Evaluation Method using Building Registration Data","authors":"Kang Taewook, Jiuk Shin, Dong-gyu Kim, Jaedo Kang","doi":"10.9798/kosham.2023.23.6.279","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.279","url":null,"abstract":"The Pohang earthquake raised concerns about the potential occurrence of fire-following earthquake (FFE). The United States and Japan effectively manage FFE risks through ignition and fire-burned ratio assessments. This study introduced a streamlined method for assessing FFE risk by leveraging a public building database (e.g., building registration data). The proposed method was applied to the Pohang regions. Hence, the ignition and fire spread calculation methods employed in the United States and Japan were adapted to suit the domestic database. The method was then implemented in clusters identified in the Pohang region. The fire-burned ratios, accompanied by the covering volume fraction (CVF) for each cluster, were computed using the extracted and newly developed building information. This method was used to evaluate the FFE risks in the Pohang areas.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"108 45","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139134502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-31DOI: 10.9798/kosham.2023.23.6.135
Yunjeong Gu, Kwanghyun Park, Wonhee Lee, Byunghun Song, Jungpyo Hong, Junho Shin
If a gas leak occurs in an industrial area, identifying the location of the gas leak and predicting the scale of the accident are challenging owing to the invisible nature of the gas. In this study, we developed a deep learning-based gas leak detection model that can obtain not only the gas leak status, but also the gas leak location and flow rate information, by using technology to visualize the ultrasonic waves generated during gas leaks. Research methods are broadly categorized into data collection and model learning methods. First, data was collected using an ultrasonic camera to capture ultrasonic images at different measurement distances (1 and 3 m) and gas leak flow rates (0-8 L/min). YOLO (You Only Look Once) was used for image learning, and the model was trained after setting the class according to the gas-leak flow range. The clarity of the collected ultrasonic images decreased as the measurement distance increased. In addition, there was little difference between the images for each leakage flow rate, posing challenges in distinguishing them with the naked eye. However, the model learning results showed high accuracy, with a precision of 0.960, recall of 0.967, and mAP (IoU (Intersection over Union) 50%) of 0.987. Applying this model as a gas safety management technology at industrial sites, enables the accurate determination of gas leak status, gas leak location, and gas leakage flow. This information is expected to guide appropriate accident responses for workers.
{"title":"Research on Deep learning based Ultrasonic Image Learning to Develop a Gas Leak Detection Model","authors":"Yunjeong Gu, Kwanghyun Park, Wonhee Lee, Byunghun Song, Jungpyo Hong, Junho Shin","doi":"10.9798/kosham.2023.23.6.135","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.135","url":null,"abstract":"If a gas leak occurs in an industrial area, identifying the location of the gas leak and predicting the scale of the accident are challenging owing to the invisible nature of the gas. In this study, we developed a deep learning-based gas leak detection model that can obtain not only the gas leak status, but also the gas leak location and flow rate information, by using technology to visualize the ultrasonic waves generated during gas leaks. Research methods are broadly categorized into data collection and model learning methods. First, data was collected using an ultrasonic camera to capture ultrasonic images at different measurement distances (1 and 3 m) and gas leak flow rates (0-8 L/min). YOLO (You Only Look Once) was used for image learning, and the model was trained after setting the class according to the gas-leak flow range. The clarity of the collected ultrasonic images decreased as the measurement distance increased. In addition, there was little difference between the images for each leakage flow rate, posing challenges in distinguishing them with the naked eye. However, the model learning results showed high accuracy, with a precision of 0.960, recall of 0.967, and mAP (IoU (Intersection over Union) 50%) of 0.987. Applying this model as a gas safety management technology at industrial sites, enables the accurate determination of gas leak status, gas leak location, and gas leakage flow. This information is expected to guide appropriate accident responses for workers.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"115 46","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139135213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The use of monitoring in river management is known to be both economical and rational, and the amount of digital information globally is increasing over time. AI research utilizing such data has been widely employed recently in the field of water resources and hydrology, yielding excellent predictive results. In this study, we utilized DO (Dissolved Oxygen) factor and meteorological data collected from the Bugok Bridge site in the Oncheoncheon watershed through an automatic water quality measurement network. We employed the LSTM (Long Short Term Memory) algorithm, a type of deep learning known for its excellent time series learning capabilities, as the learning algorithm. To confirm the potential of the use of big data, we conducted a comparative analysis by performing hourly and daily predictions, and an accuracy analysis by comparing actual and predicted data. For data utilization, missing data from the data collected by the automatic measurement network were linearly interpolated. It was confirmed that the predictive performance for the DO factor was higher using hourly than daily data.
{"title":"Prediction of the DO Factor at Bugok Bridge, Oncheoncheon, Using Deep Learning","authors":"Heesung Lim, Hyunuk An, Jaenam Lee, Hyungjin Shin, Nagweon Choi, Jingul Joo","doi":"10.9798/kosham.2023.23.6.325","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.325","url":null,"abstract":"The use of monitoring in river management is known to be both economical and rational, and the amount of digital information globally is increasing over time. AI research utilizing such data has been widely employed recently in the field of water resources and hydrology, yielding excellent predictive results. In this study, we utilized DO (Dissolved Oxygen) factor and meteorological data collected from the Bugok Bridge site in the Oncheoncheon watershed through an automatic water quality measurement network. We employed the LSTM (Long Short Term Memory) algorithm, a type of deep learning known for its excellent time series learning capabilities, as the learning algorithm. To confirm the potential of the use of big data, we conducted a comparative analysis by performing hourly and daily predictions, and an accuracy analysis by comparing actual and predicted data. For data utilization, missing data from the data collected by the automatic measurement network were linearly interpolated. It was confirmed that the predictive performance for the DO factor was higher using hourly than daily data.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"11 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139130097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-31DOI: 10.9798/kosham.2023.23.6.187
Youngjoo Song, Hakjoong Kim
The criteria for calculating the occupant load factor are crucial for predicting the evacuation behavior of occupants during a fire, determining the size of the evacuation capacity, and significantly influencing the calculation of the Required Safe Egress Time (RSET) during fire safety assessments. There are currently 11 categories for classifying safe evacuation area installation targets for neighborhood living facilities; eight of these categories allow for various numerical values to be applied. However, applying numerical values from a conservative perspective results in excessive designs with larger occupant loads. Therefore, to address this issue, this study conducted a theoretical review of occupant loads and investigated and analyzed relevant domestic and international regulations. Subsequently, one of the buildings subject to a performance-based design in City 00 was selected, and occupancy criteria were applied based on the purpose of the space. A safety assessment of the evacuation was performed. The results show that, evacuation safety was not ensured at the two exits when the occupant load factor was below 4.6 m2/person. However, when the occupant load factor was greater than 9.3 m2/person, evacuation safety is guaranteed at all exits. Through this analysis, this study aims to raise awareness of issues related to the criteria for calculating the maximum occupancy in neighborhood living facilities and the need for revisions.
{"title":"Occupant Load Factor Calculation in Neighborhood Living Facilities while Performance-Based Design","authors":"Youngjoo Song, Hakjoong Kim","doi":"10.9798/kosham.2023.23.6.187","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.187","url":null,"abstract":"The criteria for calculating the occupant load factor are crucial for predicting the evacuation behavior of occupants during a fire, determining the size of the evacuation capacity, and significantly influencing the calculation of the Required Safe Egress Time (RSET) during fire safety assessments. There are currently 11 categories for classifying safe evacuation area installation targets for neighborhood living facilities; eight of these categories allow for various numerical values to be applied. However, applying numerical values from a conservative perspective results in excessive designs with larger occupant loads. Therefore, to address this issue, this study conducted a theoretical review of occupant loads and investigated and analyzed relevant domestic and international regulations. Subsequently, one of the buildings subject to a performance-based design in City 00 was selected, and occupancy criteria were applied based on the purpose of the space. A safety assessment of the evacuation was performed. The results show that, evacuation safety was not ensured at the two exits when the occupant load factor was below 4.6 m2/person. However, when the occupant load factor was greater than 9.3 m2/person, evacuation safety is guaranteed at all exits. Through this analysis, this study aims to raise awareness of issues related to the criteria for calculating the maximum occupancy in neighborhood living facilities and the need for revisions.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"71 18","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139130490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-31DOI: 10.9798/kosham.2023.23.6.65
Hayong Kim, Jingul Joo
Changing land use patterns in China may result in adverse impacts on the climate in Northeast Asia. In particular, desertification of the Chinese mainland can also have a significant influence on the climate in South Korea, such as the occurrence of yellow dust storms. This study aimed to forecast the desertification in China through a comprehensive drought analysis. Three drought indices namely, SPI, GEVI, and SPEI, were determined for eight cities in China namely, Beijing, Guangzhou, Shanghai, Xianyang, Urumqi, Chongqing, Wuhan, and Weihai. There was a strong correlation between SPI and SPEI, while GEVI showed a slightly lower correlation. The long-term droughts that can trigger desertification exhibited high correlations among the considered indices. To assess the impact of climate change, periods of severe drought occurrence were compared in ten-year intervals since 1970. It was observed that severe droughts occurred throughout China in the 1970s and 1990s. However, there was no apparent trend in increasing drought days or worsening drought conditions. Desertification in China can be influenced not only by the rainfall but also by the changes in land use pattern and exploitation of water resources. Therefore, additional research is deemed necessary to evaluate desertification in China.
{"title":"Assessment of Drought and Desertification Outlook in China Using Meteorological Drought Indices","authors":"Hayong Kim, Jingul Joo","doi":"10.9798/kosham.2023.23.6.65","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.65","url":null,"abstract":"Changing land use patterns in China may result in adverse impacts on the climate in Northeast Asia. In particular, desertification of the Chinese mainland can also have a significant influence on the climate in South Korea, such as the occurrence of yellow dust storms. This study aimed to forecast the desertification in China through a comprehensive drought analysis. Three drought indices namely, SPI, GEVI, and SPEI, were determined for eight cities in China namely, Beijing, Guangzhou, Shanghai, Xianyang, Urumqi, Chongqing, Wuhan, and Weihai. There was a strong correlation between SPI and SPEI, while GEVI showed a slightly lower correlation. The long-term droughts that can trigger desertification exhibited high correlations among the considered indices. To assess the impact of climate change, periods of severe drought occurrence were compared in ten-year intervals since 1970. It was observed that severe droughts occurred throughout China in the 1970s and 1990s. However, there was no apparent trend in increasing drought days or worsening drought conditions. Desertification in China can be influenced not only by the rainfall but also by the changes in land use pattern and exploitation of water resources. Therefore, additional research is deemed necessary to evaluate desertification in China.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"100 39","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139131577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Stream flow management during the dry season involves balancing human water needs with the environmental requirements of the river. The allocation of stream water flow is determined by considering 10-year frequency low flow as the total available water amount, with instream flow adopted to consider the flow requirements of the river environment. However, conflicts arise over water rights between human users and the river environment during water scarcity. This study conducted an empirical-based analysis of minimum flow for river environments, focusing on water quality and aquatic ecosystems. Additionally, the perceptions of stakeholders of securing and using stream flow were investigated through a questionnaire. The outcomes of this study can contribute to enhancing technical methods for calculating instream flow and improving systems for managing river water during dry seasons.
{"title":"Stream Flow Management and Institutions: Studying Water Quality and Aquatic Ecosystems in Dry Seasons","authors":"Seongkyu Kang, Junwook Hur, Kisung Lee, Sijung Choi","doi":"10.9798/kosham.2023.23.6.317","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.317","url":null,"abstract":"Stream flow management during the dry season involves balancing human water needs with the environmental requirements of the river. The allocation of stream water flow is determined by considering 10-year frequency low flow as the total available water amount, with instream flow adopted to consider the flow requirements of the river environment. However, conflicts arise over water rights between human users and the river environment during water scarcity. This study conducted an empirical-based analysis of minimum flow for river environments, focusing on water quality and aquatic ecosystems. Additionally, the perceptions of stakeholders of securing and using stream flow were investigated through a questionnaire. The outcomes of this study can contribute to enhancing technical methods for calculating instream flow and improving systems for managing river water during dry seasons.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":" 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139135832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-31DOI: 10.9798/kosham.2023.23.6.13
Young Han Choi, Ji-Yong Chae, B. Heo
We conducted a joint tensile test and a wall cyclic loading test to assess the structural performance of the U-shaped precast concrete (PC) modular joint. The rebar experienced fracture at the edge of the L-shaped steel during the joint tensile test. The calculated average ratio of the maximum load to the nominal strength, based on the strength of the rebar, was 1.07. The result of the wall cyclic loading test showed that the PW-1R specimen, featuring a single row of PC joints, exhibited ratios of the maximum moment to a nominal bending moment of 1.19 and 1.00 in the positive (+) and negative (-) directions, respectively. Meanwhile, the ratios of the maximum moment to the nominal bending moment for the PW-2R specimen with two rows of PC joints were 1.20 and 1.06 in the positive (+) and negative (-) directions, respectively. The adequate edge distance for the joint hardware must be ensured to increase the strength of the PC joint wall.
我们进行了接头拉伸试验和墙体循环加载试验，以评估 U 型预制混凝土（PC）模块接头的结构性能。在连接拉伸试验中，钢筋在 L 形钢筋边缘发生断裂。根据钢筋强度计算得出的最大荷载与额定强度的平均比率为 1.07。墙体循环加载试验结果表明，具有单排 PC 接头的 PW-1R 试样在正（+）和负（-）方向的最大弯矩与额定弯矩之比分别为 1.19 和 1.00。而带有两排 PC 接头的 PW-2R 试样在正（+）和负（-）方向的最大弯矩与额定弯矩之比分别为 1.20 和 1.06。要提高 PC 连接墙的强度，必须确保连接硬件有足够的边缘距离。
{"title":"Evaluating Structural Performance of U-shaped Precast Concrete Modular Joints","authors":"Young Han Choi, Ji-Yong Chae, B. Heo","doi":"10.9798/kosham.2023.23.6.13","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.13","url":null,"abstract":"We conducted a joint tensile test and a wall cyclic loading test to assess the structural performance of the U-shaped precast concrete (PC) modular joint. The rebar experienced fracture at the edge of the L-shaped steel during the joint tensile test. The calculated average ratio of the maximum load to the nominal strength, based on the strength of the rebar, was 1.07. The result of the wall cyclic loading test showed that the PW-1R specimen, featuring a single row of PC joints, exhibited ratios of the maximum moment to a nominal bending moment of 1.19 and 1.00 in the positive (+) and negative (-) directions, respectively. Meanwhile, the ratios of the maximum moment to the nominal bending moment for the PW-2R specimen with two rows of PC joints were 1.20 and 1.06 in the positive (+) and negative (-) directions, respectively. The adequate edge distance for the joint hardware must be ensured to increase the strength of the PC joint wall.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"5 18","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139135896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study establishes basic data for the reasonable evaluation of evacuation safety and investigates the smoke-logging phenomenon owing to the operation of sprinklers during the initial fire. The spray droplet characteristics of a sprinkler and water mist head were examined, and the descending air current of the smoke layer was analyzed according to the type of fire source (ethanol, polyurethane) and head. A regression equation based on the findings was derived using the prediction equation for the descending air current of the smoke layer presented in a previous study.
{"title":"Experimental Study on the Smoke-Logging Phenomenon Owing to Sprinkler Operation During Initial Fire","authors":"Unggi Yoon, Inhyuk Koo, Matsuyama Ken, Young-Phil Kwon","doi":"10.9798/kosham.2023.23.6.219","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.219","url":null,"abstract":"This study establishes basic data for the reasonable evaluation of evacuation safety and investigates the smoke-logging phenomenon owing to the operation of sprinklers during the initial fire. The spray droplet characteristics of a sprinkler and water mist head were examined, and the descending air current of the smoke layer was analyzed according to the type of fire source (ethanol, polyurethane) and head. A regression equation based on the findings was derived using the prediction equation for the descending air current of the smoke layer presented in a previous study.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139130984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-31DOI: 10.9798/kosham.2023.23.6.177
Sangbum Lee, Heewon Seo, Daehoi Kim, Gilyong Lee
Logistics facilities differ significantly from general buildings in terms of diffusion flame prevention technology, necessitating the application of fire diffusion prevention technology. The total fire load in a fire compartmentation was calculated according to the method presented in The NFPA (The National Fire Protection Association) Fire Protection Handbook, based on the results of a survey on the area, height, and rack dimensions of 29 logistics warehouses in Korea to improve the fire compartmentation standard. In addition, simulations were conducted using CFAST (Consolidated Fire and Smoke Transport) for the cross-validation of these methodologies. Through fire simulations, the temperature of the upper part of each fire compartment was derived, and the equivalent fire duration was calculated by converting it to an area based on the standard time-heating temperature curve of KSF 2257-1. The NFPA methodology and values calculated through fire simulations showed similar results. In addition, we analyzed the tendency of the equivalent fire duration according to the height of the fire compartmentation and confirmed that the higher the floor height, the higher the equivalent fire duration. The results of this study can be used as basic data for improving the fire prevention standards by calculating the equivalent fire duration according to the fire load of a logistics facility and for confirming the tendency of the equivalent fire duration according to the height of the fire compartment.
{"title":"Study on Fire Load and Duration of Fire in Logistics Facilities","authors":"Sangbum Lee, Heewon Seo, Daehoi Kim, Gilyong Lee","doi":"10.9798/kosham.2023.23.6.177","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.177","url":null,"abstract":"Logistics facilities differ significantly from general buildings in terms of diffusion flame prevention technology, necessitating the application of fire diffusion prevention technology. The total fire load in a fire compartmentation was calculated according to the method presented in The NFPA (The National Fire Protection Association) Fire Protection Handbook, based on the results of a survey on the area, height, and rack dimensions of 29 logistics warehouses in Korea to improve the fire compartmentation standard. In addition, simulations were conducted using CFAST (Consolidated Fire and Smoke Transport) for the cross-validation of these methodologies. Through fire simulations, the temperature of the upper part of each fire compartment was derived, and the equivalent fire duration was calculated by converting it to an area based on the standard time-heating temperature curve of KSF 2257-1. The NFPA methodology and values calculated through fire simulations showed similar results. In addition, we analyzed the tendency of the equivalent fire duration according to the height of the fire compartmentation and confirmed that the higher the floor height, the higher the equivalent fire duration. The results of this study can be used as basic data for improving the fire prevention standards by calculating the equivalent fire duration according to the fire load of a logistics facility and for confirming the tendency of the equivalent fire duration according to the height of the fire compartment.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139132686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-31DOI: 10.9798/kosham.2023.23.6.39
Gayoon Lee, Sung-Min Lee, Jae-Hyun Kim, K. Lee
This study investigated the application of vibration analysis to ensure user safety and establish an efficient management plan for the future utilization of sports facilities. The first natural frequency of the facility was documented at 3.2 Hz, while the second and third frequencies were measured at 3.56 Hz and 4.22 Hz, respectively. Experts posit that amplification is probable when the natural frequency aligns with the second and third modes. Resonance manifested at 1.8 Hz and 2.1 Hz dynamic activities within the anticipated frequency range, resulting in notable amplitude enhancements. Therefore, Constraining rhythmic actions that may elicit repetitive movements when using sports facilities is imperative to uphold serviceability and safety standards.
{"title":"Evaluating Serviceability Limit State in a Long-span Skating Stadium Through Natural Frequency Analysis","authors":"Gayoon Lee, Sung-Min Lee, Jae-Hyun Kim, K. Lee","doi":"10.9798/kosham.2023.23.6.39","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.39","url":null,"abstract":"This study investigated the application of vibration analysis to ensure user safety and establish an efficient management plan for the future utilization of sports facilities. The first natural frequency of the facility was documented at 3.2 Hz, while the second and third frequencies were measured at 3.56 Hz and 4.22 Hz, respectively. Experts posit that amplification is probable when the natural frequency aligns with the second and third modes. Resonance manifested at 1.8 Hz and 2.1 Hz dynamic activities within the anticipated frequency range, resulting in notable amplitude enhancements. Therefore, Constraining rhythmic actions that may elicit repetitive movements when using sports facilities is imperative to uphold serviceability and safety standards.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"117 33","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139133480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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