In research, there is a growing interest in using artificial intelligence to find solutions to difficult scientific problems. In this paper, a deep learning algorithm has been applied using images of samples of materials used for road surfaces. The photographs showed cross-sections of random samples taken with a CT scanner. Historical samples were used for the analysis, located in a database collecting information over many years. The deep learning analysis was performed using some elements of the VGG16 network architecture and implemented using the R language. The learning and training data were augmented and cross-validated. This resulted in the high level of 96.4% quality identification of the sample type and its selected structural features. The photographs in the identification set were correctly identified in terms of structure, mix type and grain size. The trained model identified samples in the domain of the dataset used for training in a very good way. As a result, in the future such a methodology may facilitate the identification of the type of mixture, its basic properties and defects.
{"title":"APPLICATION OF DEEP LEARNING TECHNIQUES IN IDENTIFICATION OF THE STRUCTURE OF SELECTED ROAD MATERIALS","authors":"Grzegorz Mazurek, Małgorzata Durlej, Juraj Šrámek","doi":"10.30540/sae-2023-014","DOIUrl":"https://doi.org/10.30540/sae-2023-014","url":null,"abstract":"In research, there is a growing interest in using artificial intelligence to find solutions to difficult scientific problems. In this paper, a deep learning algorithm has been applied using images of samples of materials used for road surfaces. The photographs showed cross-sections of random samples taken with a CT scanner. Historical samples were used for the analysis, located in a database collecting information over many years. The deep learning analysis was performed using some elements of the VGG16 network architecture and implemented using the R language. The learning and training data were augmented and cross-validated. This resulted in the high level of 96.4% quality identification of the sample type and its selected structural features. The photographs in the identification set were correctly identified in terms of structure, mix type and grain size. The trained model identified samples in the domain of the dataset used for training in a very good way. As a result, in the future such a methodology may facilitate the identification of the type of mixture, its basic properties and defects.","PeriodicalId":109008,"journal":{"name":"Structure and Environment","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135296812","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 studying the dynamic response of steel-concrete railway bridges of Langer type is huge importance of ensuring the safety of such structures under high-speed train loads. Numerical simulations at the design stage require knowledge of the modal characteristics: natural frequencies, shapes and damping. In addition, in the dynamics of railway bridges subjected to high-speed trains, it is important to check the impact of dynamic effects on the ultimate and serviceability limit states. As part of the investigations displacements and accelerations of selected measurement points arising from driving the test rolling stock are analyzed. In the first stage, calculations of the eigenvalues and the corresponding eigenvectors were carried out in the Robot program for two variants of mass description (distributed and discrete). In the second stage, dynamic train passages for various vehicle speeds were examined in terms of displacements and accelerations of measurement points by using the authors’ program MES3D.
{"title":"DYNAMIC ANALYSIS OF A STEEL-CONCRETE RAILWAY BRIDGES OF LANGER TYPE UNDER THE INFLUENCE OF A MOVING LOAD","authors":"Waldemar Szaniec, Urszula Radoń, Adrián Bekő","doi":"10.30540/sae-2023-013","DOIUrl":"https://doi.org/10.30540/sae-2023-013","url":null,"abstract":"The studying the dynamic response of steel-concrete railway bridges of Langer type is huge importance of ensuring the safety of such structures under high-speed train loads. Numerical simulations at the design stage require knowledge of the modal characteristics: natural frequencies, shapes and damping. In addition, in the dynamics of railway bridges subjected to high-speed trains, it is important to check the impact of dynamic effects on the ultimate and serviceability limit states. As part of the investigations displacements and accelerations of selected measurement points arising from driving the test rolling stock are analyzed. In the first stage, calculations of the eigenvalues and the corresponding eigenvectors were carried out in the Robot program for two variants of mass description (distributed and discrete). In the second stage, dynamic train passages for various vehicle speeds were examined in terms of displacements and accelerations of measurement points by using the authors’ program MES3D.","PeriodicalId":109008,"journal":{"name":"Structure and Environment","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135297714","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 production of hot water for bathing in Poland accounts for around 15% of the total energy consumption of a typical household. According to EU data, final energy consumption for lighting and appliances is similar to final energy consumption for hot water preparation. This makes it a significant contributor to housing and utility costs, exceeded only by heating expenses. Research has indicated that only about 10% of the water utilized during a shower is necessary for hygiene purposes. Consequently, around 90% of the hot water supplied to the shower is ultimately discharged into the sewage system. By harnessing the primary energy from wastewater, we can effectively conserve heat energy and reduce the overall expenditure associated with hot water. The objective of this article is to explore the utilization of heat recovery from domestic wastewater as a means to enhance the energy efficiency of residential buildings.
{"title":"ASSESSING THE FINANCIAL BENEFITS OF USING A SHOWER DRAIN HEAT RECOVERY SYSTEM – A CASE STUDY","authors":"Agata Janaszek, Robert Kowalik","doi":"10.30540/sae-2023-015","DOIUrl":"https://doi.org/10.30540/sae-2023-015","url":null,"abstract":"The production of hot water for bathing in Poland accounts for around 15% of the total energy consumption of a typical household. According to EU data, final energy consumption for lighting and appliances is similar to final energy consumption for hot water preparation. This makes it a significant contributor to housing and utility costs, exceeded only by heating expenses. Research has indicated that only about 10% of the water utilized during a shower is necessary for hygiene purposes. Consequently, around 90% of the hot water supplied to the shower is ultimately discharged into the sewage system. By harnessing the primary energy from wastewater, we can effectively conserve heat energy and reduce the overall expenditure associated with hot water. The objective of this article is to explore the utilization of heat recovery from domestic wastewater as a means to enhance the energy efficiency of residential buildings.","PeriodicalId":109008,"journal":{"name":"Structure and Environment","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135296810","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}
Ensuring the accessibility of buildings and spaces is a common contemporary challenge, in particular for historic buildings and spaces as well as the heritage of contemporary culture. It involves all activities aimed at adapting facilities and space to the needs of people with various disabilities, including seniors. The problem of aging societies and increasing life expectancy forces extensive changes both in the approach to architectural and urban design as well as in the practice of making historic buildings accessible through architectural solutions. Particularly in existing public buildings, it becomes very important to pay attention to the specific needs and reduced psychophysical abilities of various groups of architecture recipients due to their age. For this reason, the article analyzes the accessibility of selected examples of historical objects (case studies) functioning in the structures of the modern city of Kielce – for several dozen years. In order to get acquainted with the functioning and architectural solutions of buildings, which are among the most frequented by the general public, in situ research was carried out, the multi-criteria method was used, enabling comparative analyzes and being an effective tool in making a precise assessment. The research was focused on the location of the city of Kielce, taking into account current reports and statistics indicating the largest increase in the number of people over 65 in the Świętokrzyskie Voivodeship. It was found that it is important to revise the approach and generally accepted functional and spatial solutions regarding the accessibility of this type of facilities.
{"title":"ACCESSIBILITY STUDY OF HISTORIC BUILDINGS AND CONTEMPORARY HERITAGE – ON THE EXAMPLE OF KIELCE’S PUBLIC UTILITY BUILDINGS","authors":"Joanna Gil-Mastalerczyk, Ewelina Gardyńska-Kieliś","doi":"10.30540/sae-2023-012","DOIUrl":"https://doi.org/10.30540/sae-2023-012","url":null,"abstract":"Ensuring the accessibility of buildings and spaces is a common contemporary challenge, in particular for historic buildings and spaces as well as the heritage of contemporary culture. It involves all activities aimed at adapting facilities and space to the needs of people with various disabilities, including seniors. The problem of aging societies and increasing life expectancy forces extensive changes both in the approach to architectural and urban design as well as in the practice of making historic buildings accessible through architectural solutions. Particularly in existing public buildings, it becomes very important to pay attention to the specific needs and reduced psychophysical abilities of various groups of architecture recipients due to their age. For this reason, the article analyzes the accessibility of selected examples of historical objects (case studies) functioning in the structures of the modern city of Kielce – for several dozen years. In order to get acquainted with the functioning and architectural solutions of buildings, which are among the most frequented by the general public, in situ research was carried out, the multi-criteria method was used, enabling comparative analyzes and being an effective tool in making a precise assessment. The research was focused on the location of the city of Kielce, taking into account current reports and statistics indicating the largest increase in the number of people over 65 in the Świętokrzyskie Voivodeship. It was found that it is important to revise the approach and generally accepted functional and spatial solutions regarding the accessibility of this type of facilities.","PeriodicalId":109008,"journal":{"name":"Structure and Environment","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135296809","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}
Regional economic activities and developments are measured through various techniques where Location Quotient (LQ) is one of the most reliable techniques. This paper classifies the settlements by economic potentials in the southern region of Niger state using the LQ. A structured questionnaire was administered to 1.040 in the 37 rural communities selected from 37 districts in 8 LGAs in the Niger South Federal constituency in Niger State. The data collected was analysed using LQ. Findings of the study in terms of economic potentials of the region, reveals that communities are mainly engaged in basic economic activities; including the cultivation of food crops (rice, maize, beans, millet and yam); cultivation of cash crops (benisead, ground nut, vegetable, cassava and melon), plantation agriculture (palm, kola nut, cashew and sugar cane). Findings in terms of basic economy revealed that Egbako has the highest LQ with an average score of 0.06, and is closely followed by Takuma, Batako, Kusoyaba, Mukugi and Kalmo, with an average LQ score of 0.04 each, while in terms of non-basic economy, the findings indicates that both Egbako and Kuchita have the highest non-basic LQ with an average score of 0.07, which were closely followed by Katcha, Mukugi and Gayankpa settlements with non-basic economic LQ and average scores of 0.04 each. The study concludes that LQ is one of the best techniques in measuring economic potentials of regions. It also recommends LQ for regional economic assessments.
{"title":"CLASSIFICATION OF SETTLEMENTS BY ECONOMIC POTENTIALS IN THE SOUTHERN REGION OF NIGER STATE: A LOCATION QUOTIENT APPROACH","authors":"ABDULLAHI ALHAJI ALIYU, MUSA DALIL, JAIYE J DUKIYA, EMMANUEL TANKO UMARU","doi":"10.30540/sae-2023-011","DOIUrl":"https://doi.org/10.30540/sae-2023-011","url":null,"abstract":"Regional economic activities and developments are measured through various techniques where Location Quotient (LQ) is one of the most reliable techniques. This paper classifies the settlements by economic potentials in the southern region of Niger state using the LQ. A structured questionnaire was administered to 1.040 in the 37 rural communities selected from 37 districts in 8 LGAs in the Niger South Federal constituency in Niger State. The data collected was analysed using LQ. Findings of the study in terms of economic potentials of the region, reveals that communities are mainly engaged in basic economic activities; including the cultivation of food crops (rice, maize, beans, millet and yam); cultivation of cash crops (benisead, ground nut, vegetable, cassava and melon), plantation agriculture (palm, kola nut, cashew and sugar cane). Findings in terms of basic economy revealed that Egbako has the highest LQ with an average score of 0.06, and is closely followed by Takuma, Batako, Kusoyaba, Mukugi and Kalmo, with an average LQ score of 0.04 each, while in terms of non-basic economy, the findings indicates that both Egbako and Kuchita have the highest non-basic LQ with an average score of 0.07, which were closely followed by Katcha, Mukugi and Gayankpa settlements with non-basic economic LQ and average scores of 0.04 each. The study concludes that LQ is one of the best techniques in measuring economic potentials of regions. It also recommends LQ for regional economic assessments.","PeriodicalId":109008,"journal":{"name":"Structure and Environment","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135296811","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}
Abstract Many characteristics of capillary-porous materials, including limestones and dolomites, depend on the structure of the pore space of a given material, so the article attempts to accurately determine the geometric characteristics of pores and their ability to transport water. Much information on the pore structure of carbonate rocks can be obtained from literature studies. There is a lack of information on the use of full hysteresis dilatometric thermoporometry methods for this purpose, as well as the fusion of differential analysis of volumetric strain (DAVS) results with mercury intrusion porosimetry (MIP) results. The subject of the research presented in this article is the analysis of pore structure in carbonate rocks using the method of differential analysis of volumetric strain and mercury intrusion porosimetry. Based on the measurements made, the pore size, pore volume, content of empty pores and pores containing water incapable of phase transformation were analyzed. The geometry of mesopores of rock samples examined by differential analysis of volumetric strain and mercury intrusion porosimetry was compared. A fusion of the distribution of mesopores from the DAVS study with a part of the distribution of meso- and macropores obtained by the MIP study was performer.
{"title":"Fusion of Differential Analysis of Volumetric Strain Method (Dilatometric Thermoporometry) and Mercury Intrusion Porosimetry Method for Pore Space Characterization in Carbonate Rocks","authors":"Karol Skowera","doi":"10.30540/sae-2023-009","DOIUrl":"https://doi.org/10.30540/sae-2023-009","url":null,"abstract":"Abstract Many characteristics of capillary-porous materials, including limestones and dolomites, depend on the structure of the pore space of a given material, so the article attempts to accurately determine the geometric characteristics of pores and their ability to transport water. Much information on the pore structure of carbonate rocks can be obtained from literature studies. There is a lack of information on the use of full hysteresis dilatometric thermoporometry methods for this purpose, as well as the fusion of differential analysis of volumetric strain (DAVS) results with mercury intrusion porosimetry (MIP) results. The subject of the research presented in this article is the analysis of pore structure in carbonate rocks using the method of differential analysis of volumetric strain and mercury intrusion porosimetry. Based on the measurements made, the pore size, pore volume, content of empty pores and pores containing water incapable of phase transformation were analyzed. The geometry of mesopores of rock samples examined by differential analysis of volumetric strain and mercury intrusion porosimetry was compared. A fusion of the distribution of mesopores from the DAVS study with a part of the distribution of meso- and macropores obtained by the MIP study was performer.","PeriodicalId":109008,"journal":{"name":"Structure and Environment","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124832608","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}
Abstract Segregation in the housing sector has exposed urban dwellers to series of unfavourable conditions in most cities of developing countries, which are as a result several factors. This paper is aimed at examining the factors influencing segregation in the housing neighbourhoods of Minna, Nigeria. Two-stage cluster sampling methods were adopted in the selection of neighbourhoods and households across the entire sample frame in the administration of 374 questionnaires across the 25 clustered neighbourhoods. Chi-square and Relative Importance Index (RII) as well as mean score to determine neighbourhood geographical segregation indicators pattern across all the 25 neighbourhoods in the study area. The study established that there is a significant difference between low, medium, and high density neighbourhoods in terms segregation factors in the study area. It was therefore suggested that a good urban governance structure should be put in place that will discourage class divisions among spatial entities of the city.
{"title":"Factors Responsible for Socio-Spatial Segregation in the Housing Neighbourhoods of Minna, Nigeria","authors":"Usman Abubakar Dzukogi, Ahmed Yusuf Alapata","doi":"10.30540/sae-2023-008","DOIUrl":"https://doi.org/10.30540/sae-2023-008","url":null,"abstract":"Abstract Segregation in the housing sector has exposed urban dwellers to series of unfavourable conditions in most cities of developing countries, which are as a result several factors. This paper is aimed at examining the factors influencing segregation in the housing neighbourhoods of Minna, Nigeria. Two-stage cluster sampling methods were adopted in the selection of neighbourhoods and households across the entire sample frame in the administration of 374 questionnaires across the 25 clustered neighbourhoods. Chi-square and Relative Importance Index (RII) as well as mean score to determine neighbourhood geographical segregation indicators pattern across all the 25 neighbourhoods in the study area. The study established that there is a significant difference between low, medium, and high density neighbourhoods in terms segregation factors in the study area. It was therefore suggested that a good urban governance structure should be put in place that will discourage class divisions among spatial entities of the city.","PeriodicalId":109008,"journal":{"name":"Structure and Environment","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114458427","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}
Abstract Turbidity is an important indicator of water quality in rivers, lakes, and coastal areas. Research on turbidity issues in these areas is significant not only for the development and utilization of water resources for aquaculture, tourism, and other purposes but also for assessing the level of silt (sand) in the river, allowing sediment alluvial to build up a bank of the river, and monitoring the degree of water corrosion in the bridge substructure. This allows for the building of an effective maintenance and conservation program for the bridge in response to climate change. Traditional methods have defined the turbidity of water in a local area, on a small scale. Interpolation errors of traditional methods for large areas may exceed over 20%. The use of remote sensing technology as Landsat-8 satellite images with a high geometric resolution of 30-meter multispectral channels allows us to estimate and distribute the water turbidity in a 30 × 30 m grid in detail. Using multi-temporal Landsat-8 data in 2014 and 2015 for modeling water turbidity of Tien and Hau rivers and coastal areas in South Vietnam, the obtained mean absolute error is approximately 20%, the Root Mean Square Error (RMSE) does not exceed 10 NTU. The models have a high coefficient of efficiency ME, approximately 90% (ME = 0.862), and the correlation coefficient R stronger than 90%. This allows an overall assessment of changes in water flow velocity concerning the amount of sediment in the river.
{"title":"Using Satellite Images to Retrieve the River Turbidity and Water Flow Velocity for Monitoring their Influences on Bridge","authors":"Luong Minh Chinh","doi":"10.30540/sae-2023-006","DOIUrl":"https://doi.org/10.30540/sae-2023-006","url":null,"abstract":"Abstract Turbidity is an important indicator of water quality in rivers, lakes, and coastal areas. Research on turbidity issues in these areas is significant not only for the development and utilization of water resources for aquaculture, tourism, and other purposes but also for assessing the level of silt (sand) in the river, allowing sediment alluvial to build up a bank of the river, and monitoring the degree of water corrosion in the bridge substructure. This allows for the building of an effective maintenance and conservation program for the bridge in response to climate change. Traditional methods have defined the turbidity of water in a local area, on a small scale. Interpolation errors of traditional methods for large areas may exceed over 20%. The use of remote sensing technology as Landsat-8 satellite images with a high geometric resolution of 30-meter multispectral channels allows us to estimate and distribute the water turbidity in a 30 × 30 m grid in detail. Using multi-temporal Landsat-8 data in 2014 and 2015 for modeling water turbidity of Tien and Hau rivers and coastal areas in South Vietnam, the obtained mean absolute error is approximately 20%, the Root Mean Square Error (RMSE) does not exceed 10 NTU. The models have a high coefficient of efficiency ME, approximately 90% (ME = 0.862), and the correlation coefficient R stronger than 90%. This allows an overall assessment of changes in water flow velocity concerning the amount of sediment in the river.","PeriodicalId":109008,"journal":{"name":"Structure and Environment","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122629341","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}
Abstract The article addresses the issue of the Portuguese conservation approach to religious buildings in Lisbon that have been damaged by cataclysms. The aim is to show approach to both preserving the original substance and changing the function of the sacral building. After the tragic destruction of Lisbon in the mid-18th century was followed by the use of the ruins of the Carmelite monastery church, Convento do Carmo, for adaptation into the Archaeological Museum. Church of the Nossa Senhora da Conceição Velha, also acts as a remnant of historic events. The Church of St Dominic is also an example of atypical conservation and restoration. Another one is the adaptation the São Julião church on the Museum of the Bank of Portugal. That projects are examples of pioneering conservation activities conceived as a result of the conservation practice of Portuguese architects.
摘要:本文讨论了葡萄牙对里斯本宗教建筑的保护方法，这些建筑已被灾难破坏。目的是展示既保留原始物质又改变骶骨建筑功能的方法。18世纪中叶，里斯本遭受了悲剧性的破坏，随后，加尔默罗修道院教堂(convto do Carmo)的废墟被改造成考古博物馆。Nossa Senhora da concep o Velha教堂也作为历史事件的遗迹。圣多米尼克教堂也是非典型保护和修复的一个例子。另一个是葡萄牙银行博物馆的 o julio 教堂的改编。这些项目是开创性的保护活动的例子，是葡萄牙建筑师保护实践的结果。
{"title":"Living Traces of History – Portuguese Approach to Conservation on the Example of Religious Buildings in Lisbon","authors":"M. Doroz-Turek","doi":"10.30540/sae-2023-010","DOIUrl":"https://doi.org/10.30540/sae-2023-010","url":null,"abstract":"Abstract The article addresses the issue of the Portuguese conservation approach to religious buildings in Lisbon that have been damaged by cataclysms. The aim is to show approach to both preserving the original substance and changing the function of the sacral building. After the tragic destruction of Lisbon in the mid-18th century was followed by the use of the ruins of the Carmelite monastery church, Convento do Carmo, for adaptation into the Archaeological Museum. Church of the Nossa Senhora da Conceição Velha, also acts as a remnant of historic events. The Church of St Dominic is also an example of atypical conservation and restoration. Another one is the adaptation the São Julião church on the Museum of the Bank of Portugal. That projects are examples of pioneering conservation activities conceived as a result of the conservation practice of Portuguese architects.","PeriodicalId":109008,"journal":{"name":"Structure and Environment","volume":"301 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122703585","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}
Abstract The evaluation of wind effect on the regular shape and simple diaphragm buildings and structures due to wind load has been calculated by several international codes and standards where wind gust nature and dynamic effect could not capture. Bangladesh National Building Code (BNBC) provides the tools for engineers to calculate the wind pressures for the design of a regular-shaped structure with a height to width ratio of less than 5.0, a simple diaphragm, and no unusual geometrical irregularity. If these conditions do not satisfy a wind tunnel testing is required. In this study, a comparative study between two codes in Bangladesh (BNBC-2006 and BNBC-2020), and wind tunnel test results are conducted. An investigation is carried out on four typical buildings with variable heights located within Dhaka, Bangladesh. A computational fluid dynamics (CFD) program RWIND is used to calculate the wind loads on buildings and are compared with those obtained by Bangladesh National Building Codes. Storey shear of four different building models is compared. Between BNBC-2006 and BNBC-2020, there is up to a 53% difference in storey shear. Whereas, up to 30% variation in storey shear is observed between the numerical wind tunnel test data and the data calculated using the BNBC-2020 equations. Finally, this study will help in improving BNBC code provisions for wind load calculations.
{"title":"Evaluation of Wind Effects on Buildings Using Design Codes and Numerical Wind Tunnel Tests","authors":"I. Hossain, M. Islam, A. Amin","doi":"10.30540/sae-2023-007","DOIUrl":"https://doi.org/10.30540/sae-2023-007","url":null,"abstract":"Abstract The evaluation of wind effect on the regular shape and simple diaphragm buildings and structures due to wind load has been calculated by several international codes and standards where wind gust nature and dynamic effect could not capture. Bangladesh National Building Code (BNBC) provides the tools for engineers to calculate the wind pressures for the design of a regular-shaped structure with a height to width ratio of less than 5.0, a simple diaphragm, and no unusual geometrical irregularity. If these conditions do not satisfy a wind tunnel testing is required. In this study, a comparative study between two codes in Bangladesh (BNBC-2006 and BNBC-2020), and wind tunnel test results are conducted. An investigation is carried out on four typical buildings with variable heights located within Dhaka, Bangladesh. A computational fluid dynamics (CFD) program RWIND is used to calculate the wind loads on buildings and are compared with those obtained by Bangladesh National Building Codes. Storey shear of four different building models is compared. Between BNBC-2006 and BNBC-2020, there is up to a 53% difference in storey shear. Whereas, up to 30% variation in storey shear is observed between the numerical wind tunnel test data and the data calculated using the BNBC-2020 equations. Finally, this study will help in improving BNBC code provisions for wind load calculations.","PeriodicalId":109008,"journal":{"name":"Structure and Environment","volume":"155 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126896391","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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