Diyala Journal of Engineering Sciences最新文献_第8页

Behavior of Smart Reinforced Concrete Beam Column Joints by Using Shape Memory Alloy Reinforcement Under Repeated Loading 重复荷载作用下形状记忆合金智能钢筋混凝土梁柱节点性能研究

Diyala Journal of Engineering Sciences Pub Date : 2022-08-29 DOI: 10.24237/djes.2022.15312

Maha Qassim Hameed, Ali Laftah Abbass

{"title":"Behavior of Smart Reinforced Concrete Beam Column Joints by Using Shape Memory Alloy Reinforcement Under Repeated Loading","authors":"Maha Qassim Hameed, Ali Laftah Abbass","doi":"10.24237/djes.2022.15312","DOIUrl":"https://doi.org/10.24237/djes.2022.15312","url":null,"abstract":"Using the super elastic materials in structures design is becoming very important in the research field because of their rare ability in sensing the around effect and reacting against the mechanical and thermal react. The major intent in this research is designing smart concrete beam column joints reinforced by Shape Memory Alloy (SMA) bars. The suggested systems use the (super elastic) Pseudo Elastic (PE) react of the SMA as reinforcement after being subjected under monotonic and repeated load. The behaviors of systems were explored experimentally and by using finite element simulation. In order to estimate load-displacement relationships of these specimens in this study, Analytical models were developed. A comparison of the reinforced specimens by SMA was carried out and it contained that the variation in percentage of the SMA in flexural reinforcement (25%, 50%, 75%) of the total flexural reinforcement by using this substitution get a clear effect on the failure load and the ultimate displacement of the specimens with these different ratios. The Finite Element models were developed by using the software ABAQUS. The models have been checked with the experimental results in the load-displacement terms in the top reinforcement. The models showed reasonable response. Where the ultimate load decreased by using SMA bars in (25%, 50%, 75% ) percentage of total flexural reinforcement about (50.51%, 28.32%, 38.15%) respectively, in case of static loading and (20.7%, 10.7%, 9.3%) respectively in case of repeated loading, and the deflection is increasing by using SMA in (25%, 50%, 75% ) percentage of total flexural reinforcement about (1.2%, 8.4%, 0.36%) respectively, in case of static loading and (9.6%, 5.28%, 10.9%) respectively in case of repeated loading","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117280393","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

Factors Affecting the Behaviour of Piezoelectric Ceramic Membrane of a System 影响系统压电陶瓷膜性能的因素

Diyala Journal of Engineering Sciences Pub Date : 2022-06-01 DOI: 10.24237/djes.2022.15209

Zaid Inam Ghafel, Ekhlas E. Kader

引用次数: 0

Tensile Strength and Micro-Hardness Properties of Common Roofing Sheets in Ghana. 加纳普通屋面板的拉伸强度和显微硬度特性。

Diyala Journal of Engineering Sciences Pub Date : 2022-06-01 DOI: 10.24237/djes.2022.15202

Stephen Agyei, K. Owusu-Sekyere, Jerry John Kwoffie

{"title":"Tensile Strength and Micro-Hardness Properties of Common Roofing Sheets in Ghana.","authors":"Stephen Agyei, K. Owusu-Sekyere, Jerry John Kwoffie","doi":"10.24237/djes.2022.15202","DOIUrl":"https://doi.org/10.24237/djes.2022.15202","url":null,"abstract":"Background: The request for housing in Ghana is great and as a result the selection of durable roofing sheets have become very significant as roofing plays a vital role in building construction. This study examines some mechanical properties of the most common locally-produced and imported roofing sheets in the housing industry in Ghana to inform decision-making when it comes to roofing. The roofing sheets chosen were One Star Galvanized Japan (G1*Jap), Galvanized Coated (GC), Aluzinc three star galvanized (AlZn3*), One Star Galvanized Indi (G1*Ind) and Aluminium (Al) due to their popularity and wide availability on the market. Samples from these were cut into specific dimensions and placed in a Tinius hydraulic Universal Testing Machine (Model 602) for testing.\u0000Results: The results showed that AlZn3* had the highest Young’s Modulus of Elasticity of 18.21MPa, Ultimate Tensile Strength (UTS) of 50.27 MPa; Aluminium (Al) recorded the highest Percentage Elongation of 28% and Breaking Energy 7956600 MJm-2 with G1*Jap recording the least UTS of 26.6 MPa and Breaking energy of 55378 MJm-2 whiles G1*Ind showed the least Young’s Modulus of Elasticity of 7.6 MPa and Percentage Elongation of less than one percent (0.5%).\u0000Conclusion: These numbers lead to the conclusion that AlZn3* roofing sheet is generally the best roofing sheet. Based on this it was concluded that AlZn3* is the best roofing sheet on the Ghanaian market due to its unmatched mechanical strength.","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123334719","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

The Impact of Urban Infill: A Study of Contemporary Malls in Baghdad 城市填充的影响:巴格达当代购物中心的研究

Diyala Journal of Engineering Sciences Pub Date : 2022-06-01 DOI: 10.24237/djes.2022.15206

Ashwaq Fadhel Muhkaber Alomare, Tahrir Taki Ali Al-Musawi

引用次数: 1

The Effect of Biogas Composition on the Characteristics of the Combustion Process 沼气成分对燃烧过程特性的影响

Diyala Journal of Engineering Sciences Pub Date : 2022-06-01 DOI: 10.24237/djes.2022.15201

E. Leonov, P. Trubaev

{"title":"The Effect of Biogas Composition on the Characteristics of the Combustion Process","authors":"E. Leonov, P. Trubaev","doi":"10.24237/djes.2022.15201","DOIUrl":"https://doi.org/10.24237/djes.2022.15201","url":null,"abstract":"Biogas can serve as a substitute for natural fuel, but its use is associated with a number of features associated with the difference in its composition from natural gas. Landfill gas generated in the body of MSW landfills is characterized by a significant change in composition. The purpose of the work was a theoretical study of the effect of changing the composition of biogas and the coefficient of excess air on the parameters of the combustion process - gas and air consumption, combustion temperature and on the volume of combustion products. The influence of the ratio of CO2 and N2 contained in biogas on the main combustion characteristics was also evaluated. It is concluded that the combustion of biogas of variable composition, subject to ensuring the specified heat output of the furnace or boiler, does not require a change in air flow, but only a change in the flow of biogas depending on the content of methane in it. Reducing the content of methane leads to an increase in the volume of exhaust gases and a decrease in their temperature. Therefore, a decrease in the methane content in biogas can lead to a decrease in the intensity of heat exchange and a decrease in the efficiency of the unit. The ratio of CO2 and N2 practically does not affect the thermal parameters of combustion. The results of the study are necessary when designing equipment and determining the operating mode of equipment that burns biogas that is formed in natural conditions, for example, landfill gas generated at HSW landfill.","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128947892","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 of a Hydraulic Pump of Tractor for Manufacturing with 3D printer Technology 基于3D打印技术的拖拉机液压泵设计

Diyala Journal of Engineering Sciences Pub Date : 2022-06-01 DOI: 10.24237/djes.2022.15204

Ali H. Al-Zaidi

引用次数: 0

Experimental Investigation on RC Columns Confined by Jacket with Geopolymer Adhesive 地聚合物粘合剂夹套约束RC柱的试验研究

Diyala Journal of Engineering Sciences Pub Date : 2022-06-01 DOI: 10.24237/djes.2022.15210

Thakaa A. Hussien, Wissam D. Salman

{"title":"Experimental Investigation on RC Columns Confined by Jacket with Geopolymer Adhesive","authors":"Thakaa A. Hussien, Wissam D. Salman","doi":"10.24237/djes.2022.15210","DOIUrl":"https://doi.org/10.24237/djes.2022.15210","url":null,"abstract":"Columns are one of the important structural members of engineering buildings. The impairment of reinforced concrete columns is one of the important problems affecting most structures, therefore the confinement of columns by fiber-reinforced polymers (FRP) is necessary to improve its behavior such as its load capacity, compressive strength, and ductility. The FRP used in the confinement is modern and wide application composite material in the field of civil engineering, which is pasted by epoxy. The fast impairment of epoxy at high temperatures leads to its replacement with an effective adhesive: geopolymers. This study presents the test result of an experimental investigation on confinement of six square RC columns with dimension (100*100*600mm) with geopolymer jacket under axial load conditions. The parameter considered is the jacketing material used (carbon fiber, plastic mesh, steel wire mesh, jute fiber, glass fiber mesh). Results of the test showed that confinement could improve the stiffness of the column by using a different type of material. The confinement with a carbon fiber reinforced geopolymers jackets can enhance the strength of the column after applying axial loading and improvement the performance of columns, but it is expensive. Where the increase in the load improvement and deformation capacity was (1.59 and 1.97), respectively, and the most effective jacket material in terms of economic cost and best performance in confinement operation consisted of (plastic mesh and steel wire mesh) compared to other types of material, with load enhancement by (1.41 and 1.27) and deformation capacity by (1.86 and 1.50), respectively compared with unconfined RC columns. Finally, the confinement by a different type of fiber-reinforced geopolymer adhesive is the most effective and used in the repair and rehabilitation of RC in the area with high-temperature climates.","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133484855","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

Finite Element Investigation of the Ultimate Capacity of Hollow-Flange Steel Girders with Web Openings 带腹板开口的空心法兰钢梁极限承载力有限元研究

Diyala Journal of Engineering Sciences Pub Date : 2022-06-01 DOI: 10.24237/djes.2022.15203

Usamah M. Salih, Abbas Haraj Mohammed, Marwa Z. Kareem, Kamaran S. Abdullah

{"title":"Finite Element Investigation of the Ultimate Capacity of Hollow-Flange Steel Girders with Web Openings","authors":"Usamah M. Salih, Abbas Haraj Mohammed, Marwa Z. Kareem, Kamaran S. Abdullah","doi":"10.24237/djes.2022.15203","DOIUrl":"https://doi.org/10.24237/djes.2022.15203","url":null,"abstract":"The goal of structural design is to select member sizes that are proportional to thestructural geometry in order to achieve the most cost-effective design. Steel girders weretypically made of webs, flanges and a number of internal stuffeners, the main objectiveof this research is to develop a finite element model to study the effect of the shapes andlocations of openings on the behavior of hollow flange steel plate girders. In this study,seven models were analyzed in two groups. The first group study the effect of webopenings shape openings on the behavior of hollow flange steel plate girders, while thesecond group study the effect of web openings location on the behavior of hollow flangesteel plate girders. The girders are analyzed until the final failure has occurred. Theresults obtained from finite element analysis showed that that the absence of openinghad an important effect on the ultimate load capacity. The ultimate capacity of hollowflange steel plate girder with four squares opening decreased about 5% compared tohollow flanges steel plate girder without openings.\u0000","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123830152","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 and Improving the Hardness Properties of Gray Cast Iron 灰口铸铁硬度性能的研究与提高

Diyala Journal of Engineering Sciences Pub Date : 2022-06-01 DOI: 10.24237/djes.2022.15211

Saad T. Faris, Huda Salih Mahdi, Khuder N. Abed

{"title":"Studying and Improving the Hardness Properties of Gray Cast Iron","authors":"Saad T. Faris, Huda Salih Mahdi, Khuder N. Abed","doi":"10.24237/djes.2022.15211","DOIUrl":"https://doi.org/10.24237/djes.2022.15211","url":null,"abstract":"This research focuses on the hardness of gray cast iron. Hardness is a measure of the resistance to localized plastic deformation induced by either mechanical indentation or abrasion. The machinability cannot set a specific definition. However, several indicators and directories give a clear image, the most important of which is the factors that affect the machinability of gray cast iron according to the metallurgies and the metal cutting and cutting conditions. The main goal of this research is to improve the hardness of gray cast iron. Many experiments on several samples to get different results and then compare these results to get the best which is the goal of the research. The conclusions through the practical side of this research are the different values of hardness through the different hardening processes. As the hardening processes gave a sample of grey cast iron a hardness value that differs in each type of hardening. The notes through the graph that the hardness reaches its peak in the traditional hardening, where its value is (370.6), followed by the laser hardening process, which reaches (321.6) The amount of increase between the hardness of the laser and the traditional hardness takes the value of (15.24 %) The work on samples in the form of aggregates, and each group will be treated in a specific way and then subject to tests.","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114824746","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

Structural Behavior of Reinforced Lightweight Concrete Slabs 钢筋轻混凝土板的结构性能

Diyala Journal of Engineering Sciences Pub Date : 2022-06-01 DOI: 10.24237/djes.2022.15212

Yahyia M. Hameed, Murtada A. Ismael

{"title":"Structural Behavior of Reinforced Lightweight Concrete Slabs","authors":"Yahyia M. Hameed, Murtada A. Ismael","doi":"10.24237/djes.2022.15212","DOIUrl":"https://doi.org/10.24237/djes.2022.15212","url":null,"abstract":"This paper presents an exploration of choosing the optimum density for concrete that achieves the best structural performance for two-way slabs made of concrete with fine aggregate in different proportions less than the ratio used in ordinary concrete to produce different densities, by taking advantage of the idea of fine aggregate concrete which considers as light-weight concrete to achieve lighter concrete with higher structural endurance. The experimental program includes constructing and testing five slabs, four of them made of concrete with different fine aggregate radios 75%, 50%, 25%, and 0% to get different densities (2207, 1792, 1536, 1310 kg/m3) as well as another slab made of normal concrete used as a reference slab with a density of 2414 kg/m3. The outcomes reveal that decreasing the density of the slab from 2414 kg/m3 to 1310 kg/m3 by reduction fine aggregate in concrete from 100% to 0% respectively has more effect on the first crack load than that on the ultimate load of two-way slabs as the first crack load decreases with percentages 16.7%, 33.3%, 38.9%, and 61.1% the while the ultimate load decreases with percentages 7.3%, 21.9%, 46.3%, and 56.1%, respectively as compared to the reference (normal wight concrete slab). Also, decreasing the density of the slab made the cracks form and spread quickly and the slab failure tends towards the brittleness, and the cracks diffused and grew faster and wider.","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122474571","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