Periodicals of Engineering and Natural Sciences最新文献_第4页

Dynamic response of reinforced concrete beams subjected to low velocity impact loads using nonlinear finite element analysis 钢筋混凝土梁在低速冲击荷载作用下的动力响应非线性有限元分析

Periodicals of Engineering and Natural Sciences Pub Date : 2023-05-03 DOI: 10.21533/pen.v11i3.3554

W. Abdulsahib, Bayrak S. Almuhsin, M. Abduljabbar

{"title":"Dynamic response of reinforced concrete beams subjected to low velocity impact loads using nonlinear finite element analysis","authors":"W. Abdulsahib, Bayrak S. Almuhsin, M. Abduljabbar","doi":"10.21533/pen.v11i3.3554","DOIUrl":"https://doi.org/10.21533/pen.v11i3.3554","url":null,"abstract":"The development of a nonlinear finite element method (FEM) for examining how reinforced concrete (RC) beams react to dynamic forces under the action of low-velocity impacting loads is presented in this article. The model was employed to analyze the stress distributions along with the time histories of impacting load and beam deflection, which were presented graphically. Comparisons with experimental data from previously conducted studies have been performed to verify the precision of the studied model. The findings demonstrated that the developed model was acceptable. Furthermore, the study performed a detailed parametric analysis, focusing on various factors such as replacing conventional steel bars with FRP bars, increasing concrete compressive strength, changing the impact location, using different diameters of reinforcing bars, and changing the depth of the concrete beam. According to the findings, using FRP bars resulted in 36% less peak load due to the uplift pressure caused by the FRP bars' high strength, while the maximum observed deflection of the beam reinforced with FRP bars decreased by approximately 9%. When the position of the impacting force was applied at one-third of the span of the beam, deflection was decreased by 12% when compared to the RC beam has been impacted at its midspan. In addition, the depth of the beams had a significant impact on the impacting load. These presented findings of the study may contribute to a better understanding of how a structure made of concrete responds to impacting loading.","PeriodicalId":37519,"journal":{"name":"Periodicals of Engineering and Natural Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42822724","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 behavior of sandy soils under different types of loading 不同荷载作用下砂质土的受力特性

Periodicals of Engineering and Natural Sciences Pub Date : 2023-04-28 DOI: 10.21533/pen.v11i2.3549

Reem Siham Tawfeeq, Bilal Muiassar M. Salih

{"title":"The behavior of sandy soils under different types of loading","authors":"Reem Siham Tawfeeq, Bilal Muiassar M. Salih","doi":"10.21533/pen.v11i2.3549","DOIUrl":"https://doi.org/10.21533/pen.v11i2.3549","url":null,"abstract":"The method of reinforcement soil layers was a common technique to improve the ability of the soil to retain load and reduce settlement. The technique has been somewhat dependent, whereas, in the past, there was research on this method of design and analysis. So, soil improvement by reinforcing it must be analyzed correctly. The capacity of assuming the improved bearing capacity underground of reinforced sand was investigated through the user's use of the test executor in diverse test cases. Here in this investigation, four various kinds of reinforcement materials have been used. Four circular models with different interior diameters were used to examine the effect of the circular ratio on the bearing capacity of the soil layer along the various reinforcing state of affairs. A typical plate load test was carried out with the presence of monotonous and periodic loading in three chains mentioned in tests of the monochrome plate loading on ringing base anchoring on layers of sand which are reinforced over Netlon CE121 Geo-grid as a material of reinforcement- 15 numbers, tests of periodic plate-load PLT along Geogrid (Netlon CE121) as materials of reinforcing - 15 number, the Monochromatic tests of plate-load over Geojute as a reinforcing material - 9 number, tests of periodic plate-load PLT over Geojute as a reinforcing material - 9 number.","PeriodicalId":37519,"journal":{"name":"Periodicals of Engineering and Natural Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46845859","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

Corbels strengthened with cfrp under deferent loading 不同荷载作用下碳纤维布加固钢筋

Periodicals of Engineering and Natural Sciences Pub Date : 2023-04-26 DOI: 10.21533/pen.v11i2.3547

A. Joudah, Shaymaa Abdelghany Mohamed, M. Elwi

{"title":"Corbels strengthened with cfrp under deferent loading","authors":"A. Joudah, Shaymaa Abdelghany Mohamed, M. Elwi","doi":"10.21533/pen.v11i2.3547","DOIUrl":"https://doi.org/10.21533/pen.v11i2.3547","url":null,"abstract":"Short cantilevers under loads are known as corbels, and they generally have a detrimental impact on the strength of concrete structural components by reducing their resistance to external loads. Strengthening with CFRP strips as an externally bounded approach is employed to raise that. The behavior and durability of strengthened corbels under (constant and incremental) loads are examined in this research. Twelve double corbels were cast and tested as part of the experimental program, with the dimensions of the corbels on all specimens remaining constant. While the other nine are left un-fortified as control corbels, nine of them are strengthened using CFRP strips in various patterns. The results indicate that the maximum load capacity of corbels is affected by both constant and incremental loads. In addition, the ultimate load and ultimate deflection of the legs subjected to five load cycles were less than those subjected to constant stress. The bull legs reinforced with externally bonded CFRP strips demonstrated a significant increase in ultimate load under any applied load but a reduction in ultimate deflection relative to the unreinforced bull legs under the same applied load. All failures of the bull limb were ascribed to the unbounded CFRP strips.","PeriodicalId":37519,"journal":{"name":"Periodicals of Engineering and Natural Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47302864","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

Exploring banking competition in Croatia by using the Panzar-Rosse model 运用Panzar-Rosse模型探讨克罗地亚银行业的竞争

Periodicals of Engineering and Natural Sciences Pub Date : 2023-04-26 DOI: 10.21533/pen.v11i2.3297

S. Bušatlić, Ahmed Tahir Koylu, Š. Plojović

引用次数: 0

Simulation of flow over stepped and traditional spillways 阶梯式溢洪道和传统溢洪道的水流模拟

Periodicals of Engineering and Natural Sciences Pub Date : 2023-04-24 DOI: 10.21533/pen.v11i2.3535

Abdulnaser A. Ahmed, Adnan A. Ismael, Saleh J. S. Shareef

引用次数: 0

Evaluation of shear behavior of prepared recycled concrete aggregate concrete deep beam 预制再生混凝土骨料混凝土深梁抗剪性能评价

Periodicals of Engineering and Natural Sciences Pub Date : 2023-04-24 DOI: 10.21533/pen.v11i2.3539

Abeer Hassan Wanas, Jasim Jarallah Fahad AL- Kaabi, H. A. Mushatat

{"title":"Evaluation of shear behavior of prepared recycled concrete aggregate concrete deep beam","authors":"Abeer Hassan Wanas, Jasim Jarallah Fahad AL- Kaabi, H. A. Mushatat","doi":"10.21533/pen.v11i2.3539","DOIUrl":"https://doi.org/10.21533/pen.v11i2.3539","url":null,"abstract":"In this article, the shear behavior of a deep beam made of Recycled Aggregate Concrete (RAC) was analyzed. Rapid urbanization has presented a massive new activity that is necessary to meet the needs of the influx of people. Developments of all types, from housing to infrastructure, necessitate considerable input from both natural and monetary resources. The purpose of this study is to compare the strength and loading capacity of RAC to that of Naturally Aggregate Concrete (NAC). The samples were evaluated at a controlled deformation rate of 2mm/minute in the \"Material Testing Laboratory of the Department of Civil Engineering,\" where this investigation was conducted. The researcher has chosen two different sizes of coarse totals to use throughout this study: those measuring 5mm to 15mm (60.2%) and those measuring 15mm to 25mm (40.3%). In support of her claims, the researcher presents a variety of charts and datasets in the following research. There is an overall drop in strength in the recycled aggregate concrete samples. The load-deflection curves and the techniques are depicted by which the specimens failed. Shear required beams' experimental data and predicted values. This study reveals that compared to natural aggregate concrete, recycled aggregate concrete has weaker compressive, flexural, and breaking tensile strengths. The maximum load-bearing strength of longitudinally supported beams built of \"recycled and natural aggregate concrete\" is also not significantly different.","PeriodicalId":37519,"journal":{"name":"Periodicals of Engineering and Natural Sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47480313","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

Morphological Description of Megalopal Stages of Three Portunid Species (Decapoda, 2 Brachyura, Portunidae) from Indus Deltaic Area (northern-Arabian Sea) 印度河三角洲(北阿拉伯海)3种梭子鱼(十足目，2腕足目，梭子鱼科)巨蛋期的形态描述

Periodicals of Engineering and Natural Sciences Pub Date : 2023-04-19 DOI: 10.28978/nesciences.1281619

Urwah Inam, Q. Ali, Quratulan Ahmed, L. Bat

{"title":"Morphological Description of Megalopal Stages of Three Portunid Species (Decapoda, 2 Brachyura, Portunidae) from Indus Deltaic Area (northern-Arabian Sea)","authors":"Urwah Inam, Q. Ali, Quratulan Ahmed, L. Bat","doi":"10.28978/nesciences.1281619","DOIUrl":"https://doi.org/10.28978/nesciences.1281619","url":null,"abstract":"The larvae of crustaceans, including those of brachyuran crabs, are a significant part of \u0000zooplanktonic communities constituting an ecologically important fraction of the pelagic \u0000communities. The present study describes taxonomic studies on three megalop stages of Portunus \u0000pelagicus (Linnaeus, 1758), Charybdis feriatus (Linnaeus, 1758) and Carcinus maenas (Linnaeus, \u00001758) belonging to family Portunidae collected from Indus deltaic creek system. Zooplankton \u0000samples were collected from three locations: Shahbandar 24°15’48.083’N, 67°90’15’333’E, \u0000Ketibandar 24°9’16.06’N, 67°27’7.64’E and Korangi creek 24°48’18.80’’N, 67°12’30.31’E \u0000during April to October 2018. No data available on taxonomic studies of portunid megalops upto \u0000species level from Paksitan, hence this is a first attempt to examine and to describe taxonomic \u0000features of megalops collected in the zooplankton samples. This study will contribute to the \u0000scientific knowledge on megalops taxonomy and identification as well as be useful for future \u0000research by taxonomists and biologists.","PeriodicalId":37519,"journal":{"name":"Periodicals of Engineering and Natural Sciences","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88668907","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

Preparation, investigation and studying the (physical, spectral and biological activity) of new monomers and heterocyclic compounds containing nitrogen and oxygen 含氮、氧的新单体和杂环化合物的制备、物理、光谱和生物活性的研究

Periodicals of Engineering and Natural Sciences Pub Date : 2023-04-16 DOI: 10.21533/pen.v11i2.3514

N. Jaffer, R. A. Ghafil

引用次数: 0

Capture of a Rare Smoothback Angelshark Squatina oculata (Squatinidae) in Turkish 2 Waters, with Updated Records from the eastern Mediterranean Sea 土耳其海域捕获一种罕见的浅背角鲨(浅尾鲨科)，并附地中海东部的最新记录

Periodicals of Engineering and Natural Sciences Pub Date : 2023-04-12 DOI: 10.28978/nesciences.1281611

引用次数: 0

Comparison of Weibull and Fréchet distributions estimators to determine the best areas of rainfall in Iraq Weibull和Fréchet分布估计量确定伊拉克最佳降雨区域的比较

Periodicals of Engineering and Natural Sciences Pub Date : 2023-04-11 DOI: 10.21533/pen.v11i2.3527

Inam Abdul Rahman Noaman, Huda Amer Abdul Ameer, Wahhab Salim Mohammed

引用次数: 0