This study investigated the design methodologies outlined in Korean and Japanese legislation, along with Japanese design guidelines, pertaining to natural smoke ventilation systems in logistics warehouses. Subsequently, we determined the effective area of the smoke exhaust system based on the combustible materials and building characteristics. Our findings indicated that the calculated effective area per the statutory standards of both nations was 10 m2 and 20 m2, respectively. According to Japanese guidelines, the space accommodating the CUP ranged from 24.71 m2 to 13.76 m2 for floor heights between 7 to 16 m, while the space accommodating CEP ranged from 41.83 m2 to 22.54 m2. Analyzing the quantity of smoke emitted through the calculated effective area, we observed that, when applying domestic legal standards, the smoke exhaust rate consistently remained lower than the plume flow rate. Conversely, under the Japanese standard, the smoke emission efficiency of the CUP loading warehouse surpassed that of smoke emission from 9 m to 16 m, while it was lower from 7 m to 8 m. Notably, the smoke exhaust rate consistently exceeded the generated smoke quantity in all instances within the effective area governed by the guidelines.
{"title":"Comparative Analysis of Korean and Japanese Standards for Natural Smoke Ventilation in Logistic Warehouses","authors":"Yerim Huh, Yoolim Lee, Yunseong Kim, Seunghyun Jin, Inhyuk Koo, Young-Phil Kwon","doi":"10.9798/kosham.2023.23.6.47","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.47","url":null,"abstract":"This study investigated the design methodologies outlined in Korean and Japanese legislation, along with Japanese design guidelines, pertaining to natural smoke ventilation systems in logistics warehouses. Subsequently, we determined the effective area of the smoke exhaust system based on the combustible materials and building characteristics. Our findings indicated that the calculated effective area per the statutory standards of both nations was 10 m2 and 20 m2, respectively. According to Japanese guidelines, the space accommodating the CUP ranged from 24.71 m2 to 13.76 m2 for floor heights between 7 to 16 m, while the space accommodating CEP ranged from 41.83 m2 to 22.54 m2. Analyzing the quantity of smoke emitted through the calculated effective area, we observed that, when applying domestic legal standards, the smoke exhaust rate consistently remained lower than the plume flow rate. Conversely, under the Japanese standard, the smoke emission efficiency of the CUP loading warehouse surpassed that of smoke emission from 9 m to 16 m, while it was lower from 7 m to 8 m. Notably, the smoke exhaust rate consistently exceeded the generated smoke quantity in all instances within the effective area governed by the guidelines.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"116 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139134196","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.2023.23.6.145
Byeong-Heun Lee
This study compares the dropout time obtained through a thermal analysis program with the results of a real experiment to estimate the time when a window in contact with outside air is dropped because of a fire in the compartment space. Nonlinear analysis of PVC and Al6063-T5 window frames on glass with a fire resistance of 1 h showed that the maximum strain over time was approximately 11.04% for the PVC frames and 9.55% for the Al6063-T5 frames. By comparing this over time, it was calculated that the front end occurred at approximately 750 s for the PVC frame and at 1,710 s for the Al6063-T5 frame. Existing real-world experiments show that the frame was deformed by melting and harmful penetration at approximately 540 s for PVC and 1,560 s for Al6063-T5; similar results are expected if the experiment is conducted until the window completely collapses.
{"title":"Mechanical Properties of Window Frames Exposed to High Temperature (II)","authors":"Byeong-Heun Lee","doi":"10.9798/kosham.2023.23.6.145","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.145","url":null,"abstract":"This study compares the dropout time obtained through a thermal analysis program with the results of a real experiment to estimate the time when a window in contact with outside air is dropped because of a fire in the compartment space. Nonlinear analysis of PVC and Al6063-T5 window frames on glass with a fire resistance of 1 h showed that the maximum strain over time was approximately 11.04% for the PVC frames and 9.55% for the Al6063-T5 frames. By comparing this over time, it was calculated that the front end occurred at approximately 750 s for the PVC frame and at 1,710 s for the Al6063-T5 frame. Existing real-world experiments show that the frame was deformed by melting and harmful penetration at approximately 540 s for PVC and 1,560 s for Al6063-T5; similar results are expected if the experiment is conducted until the window completely collapses.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"108 50","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139134476","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}
In South Korea, the aging of road infrastructures exceeding 30 years and susceptibility to natural disasters emphasize the imperative for improved maintenance. A novel method was developed to incorporate social factors, such as traffic flow, into maintenance strategies. This method evaluated the significance of road infrastructures within the network by considering changes in network performance resulting from changes in their condition. This method, anticipated to enhance maintenance efficiency, was envisaged for determining regular maintenance and recovery priorities of damaged infrastructures in the wake of natural disasters.
{"title":"Network-level Method for Road Infrastructure Maintenance Decision Making","authors":"Yangrok Choi, Youngjae Bae, Jangho Lim, Jiwoo Lee, Kyungrok Kwon, Jungsik Kong","doi":"10.9798/kosham.2023.23.6.55","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.55","url":null,"abstract":"In South Korea, the aging of road infrastructures exceeding 30 years and susceptibility to natural disasters emphasize the imperative for improved maintenance. A novel method was developed to incorporate social factors, such as traffic flow, into maintenance strategies. This method evaluated the significance of road infrastructures within the network by considering changes in network performance resulting from changes in their condition. This method, anticipated to enhance maintenance efficiency, was envisaged for determining regular maintenance and recovery priorities of damaged infrastructures in the wake of natural disasters.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":" 513","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139137001","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.2023.23.6.259
Kyunseo Park, Sounghun Heo, Youngdai Lee
Masonry retaining walls, which have been used since long time, have recently been widely used in the construction of small complexesas an easy-to-purchase material and eco-friendly structure. Disasters owing to the collapse of these masonry retaining walls have frequently occurred over time. The purpose of this study is to quantitatively evaluate the causes for the collapse of masonry retainingwalls by collecting and analyzing collapse data using collapse phenomenon field trips, literature review, and search tools, and to use this analysis data, to suggest measures to prevent the collapse of masonry retaining walls. As a result of collecting and analyzing collapse case data, this study found that the main causes of masonry retaining wall collapse were the loss of foundation ground (scour), ground displacement owing to the excavation of adjacent land, settlement owing to ground softening because of rainfallinfiltration, poor drainage, and inclination of stonework. The causes for collapse were of eight types, including slope sliding additionalloading, and vibration, and 16 types when literature data were included. An analysis of the collapse frequency based on the causes for collapse revealed that the two causes for collapse, foundation and drainage, accounted for approximately 60% of the total cause,and measures for stability and Governing law of critical factor were proposed using this result.
{"title":"A Study on Causes and Stability of Masonry Retaining Walls by Case Analysis","authors":"Kyunseo Park, Sounghun Heo, Youngdai Lee","doi":"10.9798/kosham.2023.23.6.259","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.259","url":null,"abstract":"Masonry retaining walls, which have been used since long time, have recently been widely used in the construction of small complexesas an easy-to-purchase material and eco-friendly structure. Disasters owing to the collapse of these masonry retaining walls have frequently occurred over time. The purpose of this study is to quantitatively evaluate the causes for the collapse of masonry retainingwalls by collecting and analyzing collapse data using collapse phenomenon field trips, literature review, and search tools, and to use this analysis data, to suggest measures to prevent the collapse of masonry retaining walls. As a result of collecting and analyzing collapse case data, this study found that the main causes of masonry retaining wall collapse were the loss of foundation ground (scour), ground displacement owing to the excavation of adjacent land, settlement owing to ground softening because of rainfallinfiltration, poor drainage, and inclination of stonework. The causes for collapse were of eight types, including slope sliding additionalloading, and vibration, and 16 types when literature data were included. An analysis of the collapse frequency based on the causes for collapse revealed that the two causes for collapse, foundation and drainage, accounted for approximately 60% of the total cause,and measures for stability and Governing law of critical factor were proposed using this result.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"86 18","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139132258","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.2023.23.6.237
Kwangmo Lim, Yongsik Yoon, Kyungtaek Koh, Kyongchul Kim
Deteriorating concrete quality is a typical problem reported in a low-temperature environment in winter. Therefore, efforts to evaluate and secure the quality of concrete are always carried out. In this study, the researchers primarily focused on developing curing methods and improving the quality of mixing materials, including chemical admixture, to secure compressive strength of concrete. The study investigated the compressive strength of concrete according to its age and observed that the compressive strength increases under the experimental conditions without any additional protection measures for the winter season. The compressive strength of the cured concrete was measured at 0 and -15 ℃ for 100 MPa Ultra-high-performance concrete (UHPC). Additionally, the property of compressive strength was compared with that of UHPC, which suffered damage due to the cold, went through a certain recovery period at room temperature. Consequently, it was confirmed that UHPC, damaged from the cold weather, achieved the specific compressive strength after 84 days. The findings from this study can enhance further understanding of the characteristics of UHPC in winter environments and contribute to establishing a construction plan for withstanding the winter seasons.
{"title":"Evaluation of Compressive Strength of UHPC Cured in A Winter Low-temperature","authors":"Kwangmo Lim, Yongsik Yoon, Kyungtaek Koh, Kyongchul Kim","doi":"10.9798/kosham.2023.23.6.237","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.237","url":null,"abstract":"Deteriorating concrete quality is a typical problem reported in a low-temperature environment in winter. Therefore, efforts to evaluate and secure the quality of concrete are always carried out. In this study, the researchers primarily focused on developing curing methods and improving the quality of mixing materials, including chemical admixture, to secure compressive strength of concrete. The study investigated the compressive strength of concrete according to its age and observed that the compressive strength increases under the experimental conditions without any additional protection measures for the winter season. The compressive strength of the cured concrete was measured at 0 and -15 ℃ for 100 MPa Ultra-high-performance concrete (UHPC). Additionally, the property of compressive strength was compared with that of UHPC, which suffered damage due to the cold, went through a certain recovery period at room temperature. Consequently, it was confirmed that UHPC, damaged from the cold weather, achieved the specific compressive strength after 84 days. The findings from this study can enhance further understanding of the characteristics of UHPC in winter environments and contribute to establishing a construction plan for withstanding the winter seasons.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"112 46","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139133151","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.2023.23.6.153
Semyeoung Lee
In fire departments with a high number of false fire dispatches, firefighters’ work stress is expected to be high because of excessive dispatch work. Therefore, after analyzing the spatial clustering pattern of the study area, we examined whether the opening and deployment of fire departments in the area was efficient and appropriate. Global Moran’s I analysis confirmed that there was spatial autocorrelation between the Gyeongsangbuk-do regions. Through local Moran’s I and hotspot (Getis-Ord’s Gi*) analysis, regions with high and low frequencies of fire misreporting were derived. Examination of the opening and deployment of firefighters in the region suggested that regions with a high average number of dispatches to the 119 Safety Center need to increase the number of firefighters, and that regions where the 119 Safety Center is concentrated should prepare measures to disperse firefighting forces to the surrounding regions.
在虚假火警派遣次数较多的消防队中，由于派遣工作过多，消防员的工作压力会很大。因此，在分析了研究地区的空间聚类模式后，我们考察了该地区消防队的开设和部署是否高效和适当。全局莫兰 I 分析证实，庆尚北道各地区之间存在空间自相关性。通过局部莫兰 I 和热点（Getis-Ord's Gi*）分析，得出了火灾误报频率较高和较低的地区。对该地区消防人员的开设和部署情况进行调查后发现，119 安全中心平均出动次数较多的地区需要增加消防人员的数量，119 安全中心集中的地区应准备向周边地区分散消防力量的措施。
{"title":"Analysis of Spatial Clustering Patterns of Fire Misidentification Through Spatial Autocorrelation Analysis: Focusing on Gyeongsangbuk-do","authors":"Semyeoung Lee","doi":"10.9798/kosham.2023.23.6.153","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.153","url":null,"abstract":"In fire departments with a high number of false fire dispatches, firefighters’ work stress is expected to be high because of excessive dispatch work. Therefore, after analyzing the spatial clustering pattern of the study area, we examined whether the opening and deployment of fire departments in the area was efficient and appropriate. Global Moran’s I analysis confirmed that there was spatial autocorrelation between the Gyeongsangbuk-do regions. Through local Moran’s I and hotspot (Getis-Ord’s Gi*) analysis, regions with high and low frequencies of fire misreporting were derived. Examination of the opening and deployment of firefighters in the region suggested that regions with a high average number of dispatches to the 119 Safety Center need to increase the number of firefighters, and that regions where the 119 Safety Center is concentrated should prepare measures to disperse firefighting forces to the surrounding regions.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"102 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139133678","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.2023.23.6.167
Heewon Seo, Sangbum Lee, Daehoi Kim, Gilyong Lee
The mock-up experiments were conducted to confirm the possibility of fire spreading, such as ignition of commodities (e.g., cardboard boxes), owing to the radiant heat, in the event of a fire in the fire shutter, which is the main fire compartment element that forms the fire compartment of logistics facilities. From the experiment, it was found that commodities located at a distance of 1, 2, and 3 m from the fire shutter can be ignited by the radiant heat of the fire shutter in the event of a fire, which can affect the spread of the fire. Therefore, to prevent the spread of the fire to neighboring fire compartments in the event of a fire in logistics facilities, it is necessary to restrict the placement of commodities within a certain separation distance from the fire shutter or install a fire shutter with radiant heat limiting performance. It is important to improve standards related to fire shutters in logistics facilities.
{"title":"Possibility of Fire Spreading Owing to Radiant Heat from Fire Shutters in Logistics Facilities","authors":"Heewon Seo, Sangbum Lee, Daehoi Kim, Gilyong Lee","doi":"10.9798/kosham.2023.23.6.167","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.167","url":null,"abstract":"The mock-up experiments were conducted to confirm the possibility of fire spreading, such as ignition of commodities (e.g., cardboard boxes), owing to the radiant heat, in the event of a fire in the fire shutter, which is the main fire compartment element that forms the fire compartment of logistics facilities. From the experiment, it was found that commodities located at a distance of 1, 2, and 3 m from the fire shutter can be ignited by the radiant heat of the fire shutter in the event of a fire, which can affect the spread of the fire. Therefore, to prevent the spread of the fire to neighboring fire compartments in the event of a fire in logistics facilities, it is necessary to restrict the placement of commodities within a certain separation distance from the fire shutter or install a fire shutter with radiant heat limiting performance. It is important to improve standards related to fire shutters in logistics facilities.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"26 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139131356","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.2023.23.6.307
Da Hae Yu, Jin Hyuk Jeon, Jung Ho Lee, Dong Jun Kim
Rising levels of underground water and inappropriate pipe alignment during rainy weather have led to a rise in rainfall-derived infiltration and inflow (RDII), increasing incidences of separate sewer overflows (SSOs) and reducing the efficiency of sewage treatment systems. RTK analysis based on measured RDII data of the target area through computer modeling is essential when maintaining sewer pipes in order to address this RDII problem. In the Sanitary Sewer Overflow Analysis and Planning (SSOAP) program used for RTK analysis, calculating RTK using a trial and error method is a bit challenging. Accordingly, this study introduces a program to calculate the optimal RTK at the measurement point using a genetic algorithm. In ROP, accuracy was added to the RDII prediction mechanism by incorporating error rates based on time intervals into the evaluation factors of SSOAP, namely rainfall inflow rate and peak flow error rate. The error rate for the SSOAP program and ROP was validated as 2.66%.
{"title":"Development of an Optimal RTK Calculation Program Using Genetic Algorithm","authors":"Da Hae Yu, Jin Hyuk Jeon, Jung Ho Lee, Dong Jun Kim","doi":"10.9798/kosham.2023.23.6.307","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.307","url":null,"abstract":"Rising levels of underground water and inappropriate pipe alignment during rainy weather have led to a rise in rainfall-derived infiltration and inflow (RDII), increasing incidences of separate sewer overflows (SSOs) and reducing the efficiency of sewage treatment systems. RTK analysis based on measured RDII data of the target area through computer modeling is essential when maintaining sewer pipes in order to address this RDII problem. In the Sanitary Sewer Overflow Analysis and Planning (SSOAP) program used for RTK analysis, calculating RTK using a trial and error method is a bit challenging. Accordingly, this study introduces a program to calculate the optimal RTK at the measurement point using a genetic algorithm. In ROP, accuracy was added to the RDII prediction mechanism by incorporating error rates based on time intervals into the evaluation factors of SSOAP, namely rainfall inflow rate and peak flow error rate. The error rate for the SSOAP program and ROP was validated as 2.66%.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"87 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139132242","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.2023.23.6.25
Jongho Park, Yeonjeong Seong, Younghun Jung
In recent times, the strengthening of government safety regulations, such as the implementation of the Serious Accidents Punishment Act, has not succeeded in reducing industrial accidents at small and medium-sized worksites, specifically in the construction sector. The comprehensive amendment of the 2020 Industrial Safety and Health Act brought about considerable changes after 30 years, thereby impacting the safety measures of construction sites. Although the implementation of construction accident prevention technology guidance is mandated, it has not been effectively and practically applied. This study used the analytic hierarchy process analysis, considering quantitative and qualitative aspects, to recommend important factors for enhancing the construction accident prevention technology guidance system. It aims to improve safety management at small and medium-sized construction sites by emphasizing institutional, economic, company-specific, and facility-related factors. The findings of this study can help evolve strategies to improve the construction disaster prevention technology guidance system by providing essential insights and effective requirements that need to be prioritized.
{"title":"Improvement of Disaster Prevention Technology Guidance","authors":"Jongho Park, Yeonjeong Seong, Younghun Jung","doi":"10.9798/kosham.2023.23.6.25","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.25","url":null,"abstract":"In recent times, the strengthening of government safety regulations, such as the implementation of the Serious Accidents Punishment Act, has not succeeded in reducing industrial accidents at small and medium-sized worksites, specifically in the construction sector. The comprehensive amendment of the 2020 Industrial Safety and Health Act brought about considerable changes after 30 years, thereby impacting the safety measures of construction sites. Although the implementation of construction accident prevention technology guidance is mandated, it has not been effectively and practically applied. This study used the analytic hierarchy process analysis, considering quantitative and qualitative aspects, to recommend important factors for enhancing the construction accident prevention technology guidance system. It aims to improve safety management at small and medium-sized construction sites by emphasizing institutional, economic, company-specific, and facility-related factors. The findings of this study can help evolve strategies to improve the construction disaster prevention technology guidance system by providing essential insights and effective requirements that need to be prioritized.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"35 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139132426","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.2023.23.6.209
Suhwan Choi, Jaesung Lee, Kyeong-Hwan Kang, Jisun You
This study evaluates the risks of roof collapse for three types of roofs designed for 1-h fire resistance performance: a roof system with a purlin, a roof system without a purlin, and a unit roofing system without a purlin. The roof system with the purlin and the unit roofing system satisfied 1-h fire resistance performance, however, the roof system without the purlin did not. It was determined that the roof systems with and without purlin were at risk of casualties owing to the rapid increases in deformations after 30 min in the fire experimental test. The maximum deformation of the unit roofing system was larger than that of the other systems. However, because the deformation over time showed a linear behavior, the risk of collapse owing to the rapid increase in deformation was considered to be the lowest.
{"title":"Fire Resistance Performances of Composite Roofs According to Application and Non-Application of Purlin","authors":"Suhwan Choi, Jaesung Lee, Kyeong-Hwan Kang, Jisun You","doi":"10.9798/kosham.2023.23.6.209","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.209","url":null,"abstract":"This study evaluates the risks of roof collapse for three types of roofs designed for 1-h fire resistance performance: a roof system with a purlin, a roof system without a purlin, and a unit roofing system without a purlin. The roof system with the purlin and the unit roofing system satisfied 1-h fire resistance performance, however, the roof system without the purlin did not. It was determined that the roof systems with and without purlin were at risk of casualties owing to the rapid increases in deformations after 30 min in the fire experimental test. The maximum deformation of the unit roofing system was larger than that of the other systems. However, because the deformation over time showed a linear behavior, the risk of collapse owing to the rapid increase in deformation was considered to be the lowest.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"119 33","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139134247","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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