Tumu yu Huanjing Gongcheng Xuebao/Journal of Civil and Environmental Engineering最新文献_第7页

Contribution of Modern Biogas Plant to Energy Source and Environment Protection in Rwanda 现代沼气厂对卢旺达能源和环境保护的贡献

Tumu yu Huanjing Gongcheng Xuebao/Journal of Civil and Environmental Engineering Pub Date : 2018-11-05 DOI: 10.4172/2165-784X.1000325

Marie Judith Kundwa, Constant Mahame, T. Bigirimana, Pascaline Sanga

{"title":"Contribution of Modern Biogas Plant to Energy Source and Environment Protection in Rwanda","authors":"Marie Judith Kundwa, Constant Mahame, T. Bigirimana, Pascaline Sanga","doi":"10.4172/2165-784X.1000325","DOIUrl":"https://doi.org/10.4172/2165-784X.1000325","url":null,"abstract":"The government of Rwanda through its Ministry of Infrastructure (MININFRA), the authority in charge of energy has initiated different initiatives aimed at finding long term solutions to energy shortage in the country where no investment has been done the last 20 years in electricity generation. Among these solutions, biogas has been identified as one of the sector to be developed. Energy plays a major role in development process of every country. This research is conducted in order to handle energy shortage problems in secondary schools located in rural areas by using a modern biogas. To achieve the aims of this research, the field survey was conducted at G. S de Ntarama and data about numbers of students and teachers, type and amount of waste produced, and impacts of lack of electricity on education were collected through interviews and questionnaires. The data were analyzed and the size of digester was estimated to be 118.524 m 3 . In addition to reducing the emission of carbon dioxide to 7 times lesser than which is emitted by firewood, it was also found that the use of biogas proves to be economical by covering the cost of firewood consumed in one month to five months. The produced energy allocated both in lighting for 4 hours and cooking for 3 hours was proved to be more advantageous and cost effective. The use of modern biogas contributes to the quality of education, environmental protection, agriculture productivity, and improve the lives of Rwandan people in general.","PeriodicalId":52256,"journal":{"name":"Tumu yu Huanjing Gongcheng Xuebao/Journal of Civil and Environmental Engineering","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76454067","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: 1

Earthquake resistant sustainable steel green buildings made of wide flange rolled sections 由宽法兰轧制截面制成的抗震可持续钢绿色建筑

Tumu yu Huanjing Gongcheng Xuebao/Journal of Civil and Environmental Engineering Pub Date : 2018-10-30 DOI: 10.4172/2165-784X-C1-015

pArup Saha Chaudhurip

引用次数: 0

Comparative Study of Equivalent Linear and Non-Linear Ground Response Analysis for Rapar District of Kutch, India 印度库奇Rapar地区等效线性和非线性地面响应分析的比较研究

Tumu yu Huanjing Gongcheng Xuebao/Journal of Civil and Environmental Engineering Pub Date : 2018-09-02 DOI: 10.5281/ZENODO.1474893

K. Dave, K. Mohan

引用次数: 0

بررسی اثر تغییر حالت بلوک های سرریزهای دندانه دار بر استهلاک انرژی جریان با مدل Flow3D

Tumu yu Huanjing Gongcheng Xuebao/Journal of Civil and Environmental Engineering Pub Date : 2018-07-15 DOI: 10.22034/JCEE.2020.13438.1349

محمدرضا روستا, داود صداقت شایگان

{"title":"بررسی اثر تغییر حالت بلوک های سرریزهای دندانه دار بر استهلاک انرژی جریان با مدل Flow3D","authors":"محمدرضا روستا, داود صداقت شایگان","doi":"10.22034/JCEE.2020.13438.1349","DOIUrl":"https://doi.org/10.22034/JCEE.2020.13438.1349","url":null,"abstract":"شوت های تند مجهز به بارشکن سال ها در پروژه های آبیاری به کار رفته اند و پاسخ مقرون به صرفه ای برای کاهش انرژی بوده اند. در این سرریزها پایه های بارشکن می تواند به صورت مانع عمل کند و سبب استهلاک انرژی آب شود و آب در مسیر حرکت خود دارای سرعت نسبتا کمی خواهد بود. سرعت خروجی کم و اقتصادی بودن ،بدون توجه به بلندی آبشار از محاسن این نوع سرریزها دانست. هدف اصلی از این تحقیق، ارزیابی توانایی نرم افزار Flow3D در شبیه سازی عددی جریان عبوری از سرریزهای دندانه دار می باشد.نرم افزارFlow3D یک نرم افزار قوی در زمینه دینامیک سیالات محاسباتی است که برای حل مسائل با هندسه پیچیده مورد استفاده قرار می‌گیرد. در این تحقیق برای صحت سنجی نرم افزار به منظور تخمین پارامترهای جریان عبوری از سرریز دندانه دار، از نتایج آزمایشگاهی و همچنین جهت شبیه‌سازی پروفیل سطح آب از روش حجم سیال (VOF) استفاده شده و با بررسی نتایج آن با نتایج آزمایشگاهی دقت مدل ارزیابی گردیده است. نتایج نشان می‌دهد که مدل Flow3D با دقت بالایی می‌تواند جهت شبیه‌سازی جریان عبوری از سرریزهای دندانه دار مورد استفاده قرار گیرد. همچنین جریان با دبی های مختلف روی شیب مجهز به بارشکن با پنج نوع مانع متفاوت بوسیله نرم افزار Flow3D شبیه سازی شد و پس از تحلیل انرژی مستهلک شده مشخص گردید شوت مجهز به بارشکن با بلوک های نیم دایره افقی بهترین عملکرد را در بین پنج مدل بررسی شده دارا است","PeriodicalId":52256,"journal":{"name":"Tumu yu Huanjing Gongcheng Xuebao/Journal of Civil and Environmental Engineering","volume":"293 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76057442","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

Mechanical Behavior of High Strength Concrete Reinforced with GlassFiber Reinforced Polymer 玻璃纤维增强聚合物增强高强混凝土的力学性能

Tumu yu Huanjing Gongcheng Xuebao/Journal of Civil and Environmental Engineering Pub Date : 2018-07-06 DOI: 10.4172/2165-784X.1000318

Mahmoud Mazen Hilles and Mohammed M Ziara

{"title":"Mechanical Behavior of High Strength Concrete Reinforced with GlassFiber Reinforced Polymer","authors":"Mahmoud Mazen Hilles and Mohammed M Ziara","doi":"10.4172/2165-784X.1000318","DOIUrl":"https://doi.org/10.4172/2165-784X.1000318","url":null,"abstract":"Effects of alkali resistant glass fiber reinforced polymer (AR-GFRP) with various proportions on the mechanical behavior of high strength concrete (HSC) were investigated on this study. Concrete mixtures were prepared with various proportions of AR-GFRP typically 0.3, 0.6, 0.9, and 1.2 by weight of cement. The mixtures were cast and tested for compressive, splitting tensile and flexural strengths in accordance to ASTM standards. The experimental results showed that the strengths increase as fiber percentage increases; the compressive strength increased from 57.85 to 66.6 MPa, the splitting tensile strength increased from 3.06 to 4.92 MPa, and the flexural strength increased from 4.84 to 7.27 MPa when fiber percentage increased from 0.0 to 1.2 respectively. In comparison with plain HSC control specimens that showed destructive sudden failure, the formation of cracks that led to failure in the specimens with AR-GFRP was gradual as the fiber percentage increases. Hence it can be concluded that the presence of fibers in the matrix has contributed towards prevent sudden crack formation and thus enhancing concrete ductility.","PeriodicalId":52256,"journal":{"name":"Tumu yu Huanjing Gongcheng Xuebao/Journal of Civil and Environmental Engineering","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74803255","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: 5

A New Approach of a Specific Sustainability Model 特定可持续性模型的新方法

Tumu yu Huanjing Gongcheng Xuebao/Journal of Civil and Environmental Engineering Pub Date : 2018-06-28 DOI: 10.4172/2165-784X.1000314

C. Bob

{"title":"A New Approach of a Specific Sustainability Model","authors":"C. Bob","doi":"10.4172/2165-784X.1000314","DOIUrl":"https://doi.org/10.4172/2165-784X.1000314","url":null,"abstract":"The paper presents a new approach for obtained the sustainability of the construction works. In the technical literature there are a lot of models which evaluate the sustainability performance of the construction works with high applicability and very comprehensive. In many cases such models show some disadvantage: some models do not cover all three dimensions of the sustainability; all of them include a great number of criteria and many of them are difficult or impossible to quantify; they are focused manly on entire buildings and they can be applied with some difficulties on other types of construction works and activities. The first step to avoid such disadvantages was by proposal a so called specific model with some advantages: high degree of utilization includes only quantitative parameters, covers the three dimensions of sustainability. The second step is presented in this paper by a new approach which takes into account the price of each parameter and finally, the sustainability cost is established. The application of new model is presented on three different construction works. Using of the new approach some advantages are obtained: such calculation is easy understandably by specialists; by using the correction of the mechanical characteristics the most sustainable solution is obtained: costs of main parameters where taken from Romanian practice, but for different zones and countries, such costs will have to be used.","PeriodicalId":52256,"journal":{"name":"Tumu yu Huanjing Gongcheng Xuebao/Journal of Civil and Environmental Engineering","volume":"38 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86872612","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

Experimental Behavior of Bolted T-Stub Connections with IPE Standard Profile IPE标准型t型螺栓连接的试验性能

Tumu yu Huanjing Gongcheng Xuebao/Journal of Civil and Environmental Engineering Pub Date : 2018-05-29 DOI: 10.4172/2165-784X.1000312

M. Maali, Mahmut Kılıç, Merve Sağıroğlu, A. Aydın

{"title":"Experimental Behavior of Bolted T-Stub Connections with IPE Standard Profile","authors":"M. Maali, Mahmut Kılıç, Merve Sağıroğlu, A. Aydın","doi":"10.4172/2165-784X.1000312","DOIUrl":"https://doi.org/10.4172/2165-784X.1000312","url":null,"abstract":"In this research, new connection types were suggested, and their behaviors were determined using full-scale experiments. T-shaped combinations created using the IPE standard profile and T-shaped elements are different from those in the literature, which utilize welded plates. Thus, problems occurring at the welds of connections such as the occurrence of fracture points and inability to perform well in place are expected to be eliminated. To recommend the use of weld-less T connections, knowledge of the behavior of the connections was needed. In addition, in this research, the effects of changes in the dimensions of the connection members on the connection behavior were examined for the T-connection type. This provided information about the optimum sizes of the connection elements. The main parameters observed were the evolution of the resistance, stiffness, rotation capacity, ductility of a joint, and energy dissipation. The aim was to provide the necessary data to improve Eurocode 3 and efficiently use residue IPE standard profiles, rather than send them back to the consumption cycle.","PeriodicalId":52256,"journal":{"name":"Tumu yu Huanjing Gongcheng Xuebao/Journal of Civil and Environmental Engineering","volume":"97 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2018-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83404601","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: 1

Collapse Analysis of a Reinforced Concrete Frame Due to Middle Column Loss by Explosion 某钢筋混凝土框架中柱爆炸损失的倒塌分析

Tumu yu Huanjing Gongcheng Xuebao/Journal of Civil and Environmental Engineering Pub Date : 2018-05-24 DOI: 10.4172/2165-784X.1000311

G. Hekal

{"title":"Collapse Analysis of a Reinforced Concrete Frame Due to Middle Column Loss by Explosion","authors":"G. Hekal","doi":"10.4172/2165-784X.1000311","DOIUrl":"https://doi.org/10.4172/2165-784X.1000311","url":null,"abstract":"The subject of the overall structural collapse under hazardous loads in reinforced concrete frames has been addressed in various researches. However, most of those studies have examined the column removal scenario where one of columns is removed and the load of this column is applied vertically on the upper face to assess the behavior of the frame until failure. One of the shortcomings of the previous mechanism is that it neglects the main reason for the failure of the column and the impact of that reason on the different elements of the structure. The current work presents a numerical investigation of frame collapse as a result of sudden column failure due to an explosive wave. The frame of study has already been tested in a previous work of the author. It was a reinforced concrete frame that has been cast without an intermediate column and then dynamically loaded in the position of the missing column until collapse. In this study, the behavior of that frame is re-evaluated under the effect of instantaneous removal of the middle column due to explosion loads. Analysis was performed using Abaqus software where frame capacity and failure mode were monitored considering different locations of application of incident wave on the target column. Comparing the obtained results with the original model indicated that both capacity and mode of failure differ significantly by changing the location of application of incident wave.","PeriodicalId":52256,"journal":{"name":"Tumu yu Huanjing Gongcheng Xuebao/Journal of Civil and Environmental Engineering","volume":"31 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2018-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75790327","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

Longitudinal Imperfections on Thin Walled Cylindrical Shells 薄壁圆柱壳的纵向缺陷

Tumu yu Huanjing Gongcheng Xuebao/Journal of Civil and Environmental Engineering Pub Date : 2018-04-26 DOI: 10.4172/2165-784X.1000309

M. Maali, A. Aydın, H. Showkati, S. M. Fatemi, Merve Sağıroğlu

{"title":"Longitudinal Imperfections on Thin Walled Cylindrical Shells","authors":"M. Maali, A. Aydın, H. Showkati, S. M. Fatemi, Merve Sağıroğlu","doi":"10.4172/2165-784X.1000309","DOIUrl":"https://doi.org/10.4172/2165-784X.1000309","url":null,"abstract":"Buckling and post-buckling are among the most important failure factors in thin walled structures. The loadcarrying behavior of cylindrical thin-walled shell structures under external pressure load is strongly dependent upon the nature and magnitude of the initial imperfections. These imperfections are invariably caused by an assortment of manufacturing processes like installing or welding. One of the most important imperfections caused by welding that has been reported to have an essential detrimental effect on the buckling resistance of these shells under external pressure load is longitudinal imperfections. Buckling and post buckling capacity of the shells depend on the H/R and t/ R ratios (H the height, R the radius and t the thickness of a cylindrical shell). The present work discusses the finiteelement models labeled as SS (Shallow Slim), DS (Deep Slim), ST (Shallow Thick) and DT (Deep Thick). The samples of first group are modiﬁed to include a line longitudinal imperfection, amplitudes of 0.5t, 1t, 2t, 3t, 4t and 8t in depth (t is the thickness of cylindrical shell). The results presented are in agreement with international codes and theories concerning buckling.","PeriodicalId":52256,"journal":{"name":"Tumu yu Huanjing Gongcheng Xuebao/Journal of Civil and Environmental Engineering","volume":"12 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2018-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88514617","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: 5

Effect of Load Eccentricity on the Strength of Concrete Columns 荷载偏心对混凝土柱强度的影响

Tumu yu Huanjing Gongcheng Xuebao/Journal of Civil and Environmental Engineering Pub Date : 2018-04-12 DOI: 10.4172/2165-784X.1000308

A. Agha, M. H. Rashid

{"title":"Effect of Load Eccentricity on the Strength of Concrete Columns","authors":"A. Agha, M. H. Rashid","doi":"10.4172/2165-784X.1000308","DOIUrl":"https://doi.org/10.4172/2165-784X.1000308","url":null,"abstract":"This research presents a theoretical study to determine the effect of the load eccentricity on the reinforced concrete column strength taking into account the variables: amount of eccentricity ratio (e/h=0.1 and 1.0); amount of longitudinal reinforcement ρ%=1% to 8%; concrete compressive strength ( ' 21,28,35,42,63 84 ); c f = and MPa steel yielding strength ( 414 525 ); y f = and MPa the steel reinforcement distance ratiocondition of loading (Uniaxial and Biaxial bending); shape of the cross section (rectangular and circular) and finally the distribution of the reinforcement on two opposite sides and on four sides. Generally the strength of columns is reduced with existing the load eccentricity and amount of losses in strength increased with increasing the eccentricity amount. The average strength ratio in case of biaxial bending condition is about (82%) of the uniaxial condition in case of (e/h=0.1) and become (55%) in case of (e/h=0.1). For uniaxial bending condition, the average relative column strength is about (75%) in case of (e/h=0.1) and (14%) in case of (e/h=0.1); while for biaxial bending condition, the ratio is (60%) in case of (e/h=0.1) and (8%) in case of (e/ h=0.1). Increasing of concrete compressive strength ( ' ) c f , steel yielding strength ( ) s γ , steel distance ratio ( ) s γ and amount of longitudinal reinforcement (ρ%) cause increasing in column strength and reducing the losses in column strength. Also the results show great effect of the load eccentricity ratio (e/h) and bending condition (uniaxial and biaxial) on the reduction of column strength. The distribution of the reinforcement on two opposite sides gives upper limit results and maximum column strength, compared with the case of when the reinforcement distributed on four sides and rectangular section with circular distribution of the reinforcement, while circular columns gives lower limit results and minimum column strength compared with other cases mentioned above.","PeriodicalId":52256,"journal":{"name":"Tumu yu Huanjing Gongcheng Xuebao/Journal of Civil and Environmental Engineering","volume":"23 1","pages":"1-15"},"PeriodicalIF":0.0,"publicationDate":"2018-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86981107","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