Journal of Engineering Issues and Solutions最新文献_第2页

Seismic response of random rubble stone masonry buildings from mid-hills of central Nepal 尼泊尔中部半山地区随机碎石砌体建筑的地震响应

Journal of Engineering Issues and Solutions Pub Date : 2024-07-19 DOI: 10.3126/joeis.v3i1.65330

Rabindra Adhikari, Ayush Raj Shrestha, Anu Aryal, Binaya Sharma, Abhishek Budhathoki, Bhawana Bhatt, Biplov Bhandari

{"title":"Seismic response of random rubble stone masonry buildings from mid-hills of central Nepal","authors":"Rabindra Adhikari, Ayush Raj Shrestha, Anu Aryal, Binaya Sharma, Abhishek Budhathoki, Bhawana Bhatt, Biplov Bhandari","doi":"10.3126/joeis.v3i1.65330","DOIUrl":"https://doi.org/10.3126/joeis.v3i1.65330","url":null,"abstract":"Rubble stone masonry in mud mortar is the most prevalent stone masonry buildings in the mid-hills accounting for more than 70% of Nepali building stock. However, these types of construction are relatively more vulnerable to seismic events. Interestingly, some of these masonry buildings performed very well while many others collapsed. For a detailed understanding of performance of these masonry at component level during earthquake excitation, this paper presents the gradual failure mechanism for a typical stone masonry from mid-hills of central Nepal. The analysis was carried out by first linear analysis of Finite Element macro-model, followed by non-linear pushover analysis using finite element method and equivalent frame method. Performance was assessed under different levels of earthquake. Linear analysis results showed that these masonry buildings satisfy the drift requirements as per Nepal building code with adequate margin but are susceptible to heavy damages, especially in shear along with significant compression crushing and tensile cracks, under design level earthquake. Detailed non-linear analysis showed that the building attains performance states of immediate occupancy, life-safety, and collapse prevention at peak ground intensities of 0.175 g, 0.25 g and 0.295 g, respectively, while the analysis using equivalent frame model showed the performance at peak ground acceleration intensities of 0.15 g, 0.19 g and 0.3 g, respectively. The existing damage in the building with partial collapse of gable due to 2015 Gorkha earthquake with estimated exposed ground intensity of 0.18 g is well predicted by the analysis.","PeriodicalId":111997,"journal":{"name":"Journal of Engineering Issues and Solutions","volume":" 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141822843","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}

引用次数: 0

Thermal comfort in healthcare waste management buildings: insights from Seti Hospital, Dhangadhi, Nepal 医疗废物管理建筑的热舒适性：尼泊尔 Dhangadhi 的 Seti 医院的启示

Journal of Engineering Issues and Solutions Pub Date : 2024-07-19 DOI: 10.3126/joeis.v3i1.65297

Vishesh Rana, Sanjaya Uprety

{"title":"Thermal comfort in healthcare waste management buildings: insights from Seti Hospital, Dhangadhi, Nepal","authors":"Vishesh Rana, Sanjaya Uprety","doi":"10.3126/joeis.v3i1.65297","DOIUrl":"https://doi.org/10.3126/joeis.v3i1.65297","url":null,"abstract":"Thermal comfort in waste management studies is emerging as a growing concern, particularly in ensuring sustainable goals align with the well-being of workers. Under the scorching summer temperatures of up to 42.2°C, waste management workers at Seti Provincial Hospital, Dhangadhi, Nepal, experience significant thermal discomfort while handling infectious waste. Recognizing this challenge, this study investigates the thermal comfort of waste management workers at Seti Provincial Hospital, Dhangadhi, Nepal, and the impact of an internally heat-generating autoclave machine on the building’s material and thermal performance. Despite extensive literature on waste management principles and the functional design of healthcare waste management blocks, there is a noticeable gap regarding thermal comfort in such facilities. This research aims to fill that gap by focusing on healthcare waste management buildings in subtropical climatic conditions in Nepal. The research uses both quantitative and qualitative methods. Indoor temperatures in the treatment zone and office space were measured and compared with outdoor temperatures over a seven-day period. Moreover, a twice-daily questionnaire survey over a week assessed workers’ thermal sensations and preferences. Surface temperatures inside and outside the treatment zone were recorded to analyze the building envelope’s response to the autoclave’s heat generation. Findings indicate that workers experience extreme thermal discomfort during summer, highlighting the necessity for strategic autoclave placement to optimize thermal comfort and the adoption of passive design strategies during the design phase.","PeriodicalId":111997,"journal":{"name":"Journal of Engineering Issues and Solutions","volume":" 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141822976","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}

引用次数: 0

Dynamic response of common stone masonry buildings under uncertain material properties 不确定材料性能下普通石砌体建筑的动力响应

Journal of Engineering Issues and Solutions Pub Date : 2023-06-06 DOI: 10.3126/joeis.v2i1.49592

R. Adhikari, Sanjita Gotame, Puja Regmi, Bipin Karki, D. Gautam

{"title":"Dynamic response of common stone masonry buildings under uncertain material properties","authors":"R. Adhikari, Sanjita Gotame, Puja Regmi, Bipin Karki, D. Gautam","doi":"10.3126/joeis.v2i1.49592","DOIUrl":"https://doi.org/10.3126/joeis.v2i1.49592","url":null,"abstract":"The major causes of the failure of the structure are either improper design or improper construction. Therefore, accurate analysis for the design of the structure is of utmost importance. However, it is extremely difficult and impractical to determine all the engineering properties of the building structure and all of its components’ analysis of each building. It is customary to adopt typical values of material properties for the analysis of such structures, usually required for seismic vulnerability analysis. However, there is a high variation in material characteristics, especially of stone masonry that can have a significant effect on the analysis. Typical stone masonry was investigated at the site and then analyzed using finite element model (FEM). Parametric analysis was conducted for a range of young’s modulus of elasticity values of a masonry wall. The dynamic characteristics of the building were determined from the modal analysis. Seismic loading was done using dynamic methods and its effect was determined as design stresses and building deformations for the comparison. The results indicated that various building responses have a different relationship with the elasticity parameter of the wall, indicating that a very good engineering judgment is required in the analysis of stone masonry buildings that do not have standard material properties.","PeriodicalId":111997,"journal":{"name":"Journal of Engineering Issues and Solutions","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128287465","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}

引用次数: 0

Improving classroom thermal comfort of educational buildings: Case of Kantipur City College 提高教育建筑教室热舒适性:以坎提普尔城市学院为例

Journal of Engineering Issues and Solutions Pub Date : 2023-06-06 DOI: 10.3126/joeis.v2i1.49486

Bilove Moktan, Sanjaya Uprety

{"title":"Improving classroom thermal comfort of educational buildings: Case of Kantipur City College","authors":"Bilove Moktan, Sanjaya Uprety","doi":"10.3126/joeis.v2i1.49486","DOIUrl":"https://doi.org/10.3126/joeis.v2i1.49486","url":null,"abstract":"Well-designed and thermally comfortable learning spaces contribute to better academic performance, enhanced concentration, and improved productivity of students. Thermal comfort is often one of the most overlooked design parameters while constructing educational buildings in Nepal. The Nepalese government has yet to develop design guidelines or regulations which ensures optimum indoor thermal comfort. Due to this, classrooms either lack insulation, have poor ventilation, or have overall poor thermal performance. This study illustrates how the use of passive design measures such as thermal mass, insulation, and glazing can help in improving the thermal comfort of students in such classrooms. Kantipur City College, an engineering college in Kathmandu was selected as a case study to evaluate the thermal environment of the classrooms. The field study also determined the existing comfort levels of students based on their thermal sensations and preferences. Design Builder Software was used to carry out the thermal simulation analysis and evaluate the impacts of passive design strategies when applied to the base classroom model. Field survey showed that the indoor temperatures were in the range of 27-32 °C, and students felt quite uncomfortable during the lesson hours. Results from simulation analysis revealed that providing insulation to the walls and ceilings, applying thermal mass, or changing the window glazing lowered temperatures by 2-4 °C. The study concluded that careful consideration of appropriate passive design measures can help to significantly lower indoor temperature during the summer and maintain thermal comfort in the classrooms.","PeriodicalId":111997,"journal":{"name":"Journal of Engineering Issues and Solutions","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131589031","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}

引用次数: 0

Design and development of compressed air engine 压缩空气发动机的设计与开发

Journal of Engineering Issues and Solutions Pub Date : 2023-06-06 DOI: 10.3126/joeis.v2i1.50326

Aplesh Kumar Mahato, Dinanath Sharma, Durga Bastakoti, Min Narayan Shrestha, Niraj Bhatt, Rajesh Koirala

{"title":"Design and development of compressed air engine","authors":"Aplesh Kumar Mahato, Dinanath Sharma, Durga Bastakoti, Min Narayan Shrestha, Niraj Bhatt, Rajesh Koirala","doi":"10.3126/joeis.v2i1.50326","DOIUrl":"https://doi.org/10.3126/joeis.v2i1.50326","url":null,"abstract":"This research aims to build an engine that uses compressed air as a fuel to provide mechanical energy to rotate a crankshaft which can be used for useful work. The specific objectives of the study are to design and fabricate a compressed air engine within a pressure range of two to five bar and to test the engine's performance in terms of angular velocity of the crankshaft, torque produced at the crankshaft, stress and displacement analysis on the base frame and efficiency of the engine. To achieve these objectives, design equations of inertial forces in reciprocating parts is used to calculate the torque produced at the crankshaft, computational tool is used to calculate the stress and displacement analysis on the base of the frame and experimentally the engine is tested to calculate the angular velocity at the crankshaft and valve timing so that crankshaft produces uniform rotational motion. It was found that, the angular velocity is directly and Arduino valve timing is inversely proportional to the pressure exerted by the piston. A force of 245.43 N is exerted by the pneumatic piston cylinder when rotated at 100 RPM producing a torque of 45 Nm at efficiency of 29.60%. The base frame exerted a maximum stress of 48 Mpa and maximum displacement of 1.9 mm, both at the location at which the crankshaft is installed. It is important to note that the results may not be generalizable to all compressed air engines and further research is needed to fully understand their performance and capabilities.","PeriodicalId":111997,"journal":{"name":"Journal of Engineering Issues and Solutions","volume":"260 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121211854","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}

引用次数: 2

Seismicity parameters of Nepal by cumulative slope point change method 尼泊尔地震活动性参数的累积斜率点变化法

Journal of Engineering Issues and Solutions Pub Date : 2023-06-06 DOI: 10.3126/joeis.v2i1.49450

R. Khanal, Radhesh Shrestha, Pawan Chhetri, B. Pradhan

引用次数: 0

Grid parameters analysis of 11 kV radial feeder on residential areas based on forecasted emerging load: A case study of Tarkeshwor Municipality, Nepal 基于新负荷预测的11千伏住宅径向馈线电网参数分析——以尼泊尔塔克什沃市为例

Journal of Engineering Issues and Solutions Pub Date : 2023-06-06 DOI: 10.3126/joeis.v2i1.49479

Bidhan Pokhrel, Nawraj Bhattarai, Ramhari Poudyal, Rupesh Gautam, Khem N. Paudyal

{"title":"Grid parameters analysis of 11 kV radial feeder on residential areas based on forecasted emerging load: A case study of Tarkeshwor Municipality, Nepal","authors":"Bidhan Pokhrel, Nawraj Bhattarai, Ramhari Poudyal, Rupesh Gautam, Khem N. Paudyal","doi":"10.3126/joeis.v2i1.49479","DOIUrl":"https://doi.org/10.3126/joeis.v2i1.49479","url":null,"abstract":"The study focuses on the technical performance analysis of a radial distribution network in a rapidly urbanising area under the current, future, and optimised scenarios. The control area in this research is Tarkeshwor Municipality, Nepal, which lies in the outer stretch of Kathmandu, representing the urbanising loads. In this paper, the electric cooking load has been added to the long term forecasted load up to ten years from now, representing emerging technology and load that adds to the peak load in the daily load curve of the control area. The placement of reactive power suppliers (i.e. Capacitor placement) in optimal network buses is also proposed as an optimisation tool that exhibits improved power quality and reliability with the forecasted load. The peak load is found to be increased to 21.93 MVA at the tenth year's end including targeted emerging load due to which the voltage profile also goes out of the limits. Optimal placement of capacitor on optimal buses results in improved voltage profile and also reduces active power loss of the distribution network in the control area. The analysis and discussion in this research will be helpful to the policymakers as well as the electric utility for planning the supply and utilisation pattern of electricity in the future. ","PeriodicalId":111997,"journal":{"name":"Journal of Engineering Issues and Solutions","volume":"324 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131551806","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}

引用次数: 0

Studying the spatio-temporal changes of urban green space: A case study of Pokhara Metropolitan City 城市绿地时空变化研究——以博卡拉市为例

Journal of Engineering Issues and Solutions Pub Date : 2023-06-06 DOI: 10.3126/joeis.v2i1.49491

Sandip Subedi, S. Pokhrel

{"title":"Studying the spatio-temporal changes of urban green space: A case study of Pokhara Metropolitan City","authors":"Sandip Subedi, S. Pokhrel","doi":"10.3126/joeis.v2i1.49491","DOIUrl":"https://doi.org/10.3126/joeis.v2i1.49491","url":null,"abstract":"Green space refers to land areas covered primarily with vegetation, including parks, gardens, nature reserves, and other similar areas. These spaces offer various benefits such as supporting biodiversity, enhancing air and water quality, promoting mental and physical well-being, providing opportunities for recreation and social interaction, and improving the overall beauty of the environment. To assess the dynamics of green space in Pokhara Metropolitan City (PMC), maximum likelihood classification and normalized difference vegetation index (NDVI) methods were utilized to analyze satellite imagery. The study showed two distinct patterns of urban green space, with the green space in the central city gradually decreasing, while the nearby suburban and remote areas of PMC experienced an increase as agricultural land was transformed into grassland due to population migration. Consequently, the area of moderately healthy vegetation increased, while healthy vegetation decreased from 4926 hectares (10.61% of total area) to 2535 hectares (5.46% of total area). Additionally, the area of no vegetation such as urban areas increased from 1.8% to 2.17%. An accuracy assessment was used to validate the analyzed data, resulting in an overall accuracy of 81.91% and a Kappa coefficient of 0.63. The primary factors contributing to the loss of green spaces were urban growth and population growth within the inner metropolis. Therefore, it is crucial to maintain PMC's green areas and give more attention to this issue while developing municipal plans and policies in the future.","PeriodicalId":111997,"journal":{"name":"Journal of Engineering Issues and Solutions","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129131237","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}

引用次数: 0

Impact of the road improvement project on household consumption: evidence from Nepal 道路改善工程对家庭消费的影响:来自尼泊尔的证据

Journal of Engineering Issues and Solutions Pub Date : 2023-06-06 DOI: 10.3126/joeis.v2i1.49505

Sabin Koirala

引用次数: 0

Evaluation of Nakagami and Birnbaum-Saunders probability distribution for wind speed and power estimation Nakagami和Birnbaum-Saunders概率分布对风速和功率估计的评价

Journal of Engineering Issues and Solutions Pub Date : 2023-06-06 DOI: 10.3126/joeis.v2i1.49596

A. Parajuli

引用次数: 0