Journal of the Mechanical Behavior of Materials最新文献_第9页

Identification of the main causes of risks in engineering procurement construction projects 识别建设项目工程采购风险的主要原因

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-01-01 DOI: 10.1515/jmbm-2022-0029

N. H. Khairullah, M. Hilal, Abbas Mohammed

引用次数: 1

Studying the effect of shear stud distribution on the behavior of steel–reactive powder concrete composite beams using ABAQUS software 采用ABAQUS软件研究剪力柱分布对钢-活性粉末混凝土组合梁性能的影响

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-01-01 DOI: 10.1515/jmbm-2022-0046

Y. A. Ali, M. Falah, Alaa H. Ali, M. Z. Al-mulali, Z. Al-khafaji, T. M. Hashim, Abdul Hadi Meteab AL Sa’adi, O. Al-Hashimi

{"title":"Studying the effect of shear stud distribution on the behavior of steel–reactive powder concrete composite beams using ABAQUS software","authors":"Y. A. Ali, M. Falah, Alaa H. Ali, M. Z. Al-mulali, Z. Al-khafaji, T. M. Hashim, Abdul Hadi Meteab AL Sa’adi, O. Al-Hashimi","doi":"10.1515/jmbm-2022-0046","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0046","url":null,"abstract":"Abstract Using the ABAQUS software, this article presents a numerical investigation on the effects of various stud distributions on the behavior of composite beams. A total of 24 continuous 2-span composite beam samples with a span length of 1 m were examined (concrete slab at the top and steel I-section at the bottom). The concrete slab used is made of a reactive powder concrete with a compressive strength of 100.29 MPa. The total depth of each sample was 0.220 m. The samples were separated into four groups. The first group involved 6 specimens with shear connectors distributed into 2 rows with different distances (65, 85, 105, 150, 200, and 250 mm). The second group had the same spacing of shear connectors as the first group except that the shear connectors were distributed with one row along the longitudinal axis. The third group consisted of six specimens with single and double shear connectors distributed along the longitudinal axis. The fourth group included six specimens with one row of shear connectors arranged in a staggered distribution along the longitudinal axis. Results show that the optimum spacing was 105 mm in all groups and the deflection in group four fluctuated up and down due to the non-symmetrical distribution of the shear connectors.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":"31 1","pages":"416 - 425"},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42767381","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

Effect of microbial-induced calcite precipitation (MICP) on the strength of soil contaminated with lead nitrate 微生物诱导方解石降水对硝酸盐铅污染土壤强度的影响

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-01-01 DOI: 10.1515/jmbm-2022-0016

Zahraa Samer Hadi, K. A. saeed

{"title":"Effect of microbial-induced calcite precipitation (MICP) on the strength of soil contaminated with lead nitrate","authors":"Zahraa Samer Hadi, K. A. saeed","doi":"10.1515/jmbm-2022-0016","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0016","url":null,"abstract":"Abstract Microbial induced calcite precipitation method MICP is a sustainable and eco-friendly technique for soil stabilization. To show the optimum effectiveness of the bioremediation within the silty sand matrix, a model of plastic boxes and PVC molds was made with an air pump placed in an isolated room at a temperature range of 25–27°C. The molds were perforated from sides and bottoms and opened from the top with a transparent film of filter paper (placed on the inner surface). The major feature of this treatment system is allowing the cementation solution to penetrate easily into soil samples. The results showed a positive effect of Bacillus subtilis in enhancing the strength properties of lead contaminated soil. Unconfined compressive strength increased from 65 kPa to 539, 527, and 525 kPa. Cohesion increased from 4.5 to 40, 41.9, and 42 kPa at concentrations of 15, 20, and 25% respectively. Angle of internal friction increased from 18.94° to 38.2°, 40°, and 40.74° respectively after 14 days. Thereafter, it become 40.92° and 41.5° at concentrations of 15 and 20%, respectively and decreased to 36.75° of 25% at 28 days. Microstructural characteristics represent the formation of calcium carbonate and lead compounds, which were the reasons for the improvement in the strength and the alteration in lead from a soluble to insoluble form, a hence less toxic element.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":"31 1","pages":"143 - 149"},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44806191","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: 4

Experimental and numerical study of the bulb's location effect on the behavior of under-reamed pile in expansive soil 膨胀土中扩底桩扩底位置效应的试验与数值研究

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-01-01 DOI: 10.1515/jmbm-2022-0010

H. M. Ziyara, B. Albusoda

{"title":"Experimental and numerical study of the bulb's location effect on the behavior of under-reamed pile in expansive soil","authors":"H. M. Ziyara, B. Albusoda","doi":"10.1515/jmbm-2022-0010","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0010","url":null,"abstract":"Abstract In this experimental and numerical analysis, three varieties of under-reamed piles comprising one bulb were used. The location of the bulb changes from pile to pile, as it is found at the bottom, center, and top of the pile, respectively. PLAXES 3D was used to conduct the research. In expansive soil, the under-reamed piles were 350 mm long, with the pile tip in dense sandy soil. The experiment was carried out in both saturated and unsaturated circumstances. The influence of the bulb location on the pile's bearing capacity for vertical and lateral loads, as well as the amount of swelling pressure and upward movement owing to swelling, was investigated. The results showed that in the unsaturated state, the bulb at the top of the pile gives bearing that is higher than the bulb at the bottom of the pile and near to the bulb in the center. In the case of unsaturated soil, the closer the bulb is to the top, the larger the bearing capacity, whereas in the event of swelling, the bearing capacity is highest when the bulb is in the middle of the pile. The same is true of the pile's upward movement, which is greater when the bulb is at the top than when it is at the bottom.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":"31 1","pages":"90 - 97"},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44892124","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: 3

Numerical simulation to the effect of applying rationing system on the stability of the Earth canal: Birmana canal in Iraq as a case study 配给制对土渠稳定性影响的数值模拟——以伊拉克Birmana运河为例

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-01-01 DOI: 10.1515/jmbm-2022-0216

Alaa Hu. Danoosh, M. Th. Al-Hadidi

{"title":"Numerical simulation to the effect of applying rationing system on the stability of the Earth canal: Birmana canal in Iraq as a case study","authors":"Alaa Hu. Danoosh, M. Th. Al-Hadidi","doi":"10.1515/jmbm-2022-0216","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0216","url":null,"abstract":"Abstract Extreme conditions will cause the water level of high fill canal segment to change suddenly, which will affect the velocity and pore pressure of the slope. A 9 km irrigation earth canal in the city of Alsyahy, 15 km away from Al-Hilla city, and branching off from the left side of Shatt Al-Hilla at 57 km, was studied. The aim of this work is to study and analyze the effect of rationing system on the Birmana earthen canal during rapid drawdown case. Finite element modeling with Geo-Studio software was used in the present study to analyze the combined seepage and slope stability for three cycles. The resulting minimum safety factor obtained from the analysis using the saturated and unsaturated soil model was found to be 1.161, 1.142, 1.159, and 1.2 from the Janbu, Bishop, Morgenstern-Price, and Spencer methods, respectively. The factor of safety (FOS) values in three cycles are less than the required value. Finally, the FOC decreased by 66% from its value before the rationing system was applied, the area of canal and slip surface increased by 77 and 14%, respectively, due to the applied rationing system. These changes led to an irregular water distribution along the canal, in addition to a reduction in road width.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":"31 1","pages":"729 - 738"},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47213290","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

Deformability of non-prismatic prestressed concrete beams with multiple openings of different configurations 不同结构多开孔非棱柱形预应力混凝土梁的变形性能

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-01-01 DOI: 10.1515/jmbm-2022-0013

Amjad Majeed Al-Hilali, A. F. Izzet, N. Oukaili

{"title":"Deformability of non-prismatic prestressed concrete beams with multiple openings of different configurations","authors":"Amjad Majeed Al-Hilali, A. F. Izzet, N. Oukaili","doi":"10.1515/jmbm-2022-0013","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0013","url":null,"abstract":"Abstract This work presents experimental research using draped prestressed steel strands to improve the load-carrying capacity of prestressed concrete non-prismatic beams with multiple openings of various designs. The short-term deflection of non-prismatic prestressed concrete beams (NPCBs) flexural members under static loading were used to evaluate this improvement. Six simply supported (NPCBs) beams, five beams with openings, and one solid specimen used as a reference beam were all tested as part of the experiment. All of the beams were subjected to a monotonic midpoint load test. The configuration of the opening (quadrilateral or circular), as well as the depth of the chords, were the variables studied in this study. In comparison to a solid beam, experimental results show that beams with openings have a lower load-carrying capacity not exceeding (2.3–10.6%) and higher mid-span deflection through all loading stages of elastic, service, and ultimate loads (14–73%), (19–44%), and (31–55%), respectively. Furthermore, specimens with circular openings had stiffer behaviour under load than those with quadrilateral openings. Beams with quadrilateral openings and inclined posts, on the other hand, were stiffer than beams with quadrilateral openings and vertical posts.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":"31 1","pages":"118 - 126"},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44311974","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: 3

Identifying the selection criteria of design consultant for Iraqi construction projects 确定伊拉克建筑项目设计顾问的选择标准

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-01-01 DOI: 10.1515/jmbm-2022-0036

S. Alkaabi, A. Mahjoob

{"title":"Identifying the selection criteria of design consultant for Iraqi construction projects","authors":"S. Alkaabi, A. Mahjoob","doi":"10.1515/jmbm-2022-0036","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0036","url":null,"abstract":"Abstract The quality and cost of constructed buildings are heavily influenced by the performance of design/auditing consultants. Thus, selecting the right design consultant and design auditing consultants is of utmost importance and not an easy task for any construction client. so, the client should specify the efficiency criteria and assess the performance levels of the design and design auditing consultant firm. The study aims to identify the selection criteria of the design consultant in construction projects and also identify the selection criteria of the design auditing consultant for the construction projects by using the Delphi survey with applying the principal components analysis (PCA). The results of the present study showed that there are 13 key criteria for selecting the design consultant, where the criterion of “Efficiency and experience of the company/consultant in previous work” was of the highest importance. While there are Ten key criteria for selecting the design auditing consultant for the construction project, where the criterion of “Credibility and professional integrity (transparency, professional conduct, and ethics)” was of the highest importance in the decision-making process. Moreover, the results of applying PCA on the Delphi survey outcomes showed that all the resulting selection criteria are most valuable and suitable for the selection process in construction projects.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":"31 1","pages":"290 - 297"},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46688623","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

Synthesis and study of magnesium complexes derived from polyacrylate and polyvinyl alcohol and their applications as superabsorbent polymers 聚丙烯酸酯-聚乙烯醇镁配合物的合成、研究及其在高吸水性聚合物中的应用

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-01-01 DOI: 10.1515/jmbm-2022-0053

S. A. Kadhim, Awham M. Hameed, R. Rasheed

{"title":"Synthesis and study of magnesium complexes derived from polyacrylate and polyvinyl alcohol and their applications as superabsorbent polymers","authors":"S. A. Kadhim, Awham M. Hameed, R. Rasheed","doi":"10.1515/jmbm-2022-0053","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0053","url":null,"abstract":"Abstract Novel superabsorbent polymers (SAPs) were created by solution polymerization at ambient temperature using potassium polyacrylate (KPA), polyvinyl alcohol (PVA), and magnesium chloride as a cross-linking agent with different weights of 0.4, 0.5, 0.6, 0.7, 0.8, and 1 g for KPA and 0.33, 0.44, 0.55, 0.733, and 1.1 g for PVA. Fourier transforms infrared (FTIR) and UV-Vis spectroscopy were used to determine the chemical composition of the SAP complexes. The outcomes revealed that the KPA and PVA successfully interacted with the magnesium chloride. The morphology of the surfaces shows a uniform porous interconnected microstructure as revealed by field emission scanning electron microscopy. The effective preparation was confirmed by thermal characterization (thermogravimetric analysis and differential scanning calorimetry) of the SAPs. The influence of the cross-linker agent on the SAPs’ water absorbency was examined. The magnesium polyacrylate (Mg-PA) (0.6 g of MgCl2) SAP has a maximum swelling capacity of 650%, while that of magnesium polyvinyl alcohol (Mg-PVA) (0.55 g of MgCl2) was 244%. The findings confirmed that the SAPs have excellent swelling and water-retaining capabilities. The strategy used in this investigation may function as a model for developing and widespread usage of SAPs in agriculture and horticulture.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":"31 1","pages":"462 - 472"},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48839420","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

Procurement challenges analysis of Iraqi construction projects 伊拉克建筑项目采购挑战分析

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-01-01 DOI: 10.1515/jmbm-2022-0012

Sadeq Abdul Hamza, Sawsan M. Rasheed, A. Hussein

{"title":"Procurement challenges analysis of Iraqi construction projects","authors":"Sadeq Abdul Hamza, Sawsan M. Rasheed, A. Hussein","doi":"10.1515/jmbm-2022-0012","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0012","url":null,"abstract":"Abstract Public procurement in Iraq plays an essential function in the development and recovery of the country's economy as well as providing the essential infrastructure for the growth of the private sector. The Coalition Provisional Authority's Government Procurement Legislation No. 87 (2004) is the final procurement law in effect in Iraq. Preparations are underway for new procurement legislation as of Oct. 2021. The objective of the paper is to determine the effectiveness of the public procurement process used in a construction project in Iraq, there is also a lack of procurement methods and policy consistency between government agencies. procurement techniques, tender documentation information, Advertising deadlines, and document management procedures, for example, vary amongst federal contracting agencies. Furthermore, there is no mandatory process for the definition and disclosure of tender evaluation criteria, providing room for subjectivity in the tender award process. This paper's major conclusion that is competitive tendering is open to everyone, tendering is not mandated as Iraq's general rule, despite the fact that it is considered best practice elsewhere. Direct invitation techniques are widely used in the construction project process tendering of Iraq and if not adequately managed, they can lead to bias, fraud, and corruption.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":"31 1","pages":"112 - 117"},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42074821","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: 3

Sustainability in the design of liquefied petroleum gas systems used in buildings 建筑用液化石油气系统设计的可持续性

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2022-01-01 DOI: 10.1515/jmbm-2022-0027

Amna Amer Farouq, B. Al-Obaidi

{"title":"Sustainability in the design of liquefied petroleum gas systems used in buildings","authors":"Amna Amer Farouq, B. Al-Obaidi","doi":"10.1515/jmbm-2022-0027","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0027","url":null,"abstract":"Abstract With the spread of the use of liquefied petroleum gas (LPG) in developing countries for use in domestic cooking with the increase in the expansion and distribution of gas pipelines for residential buildings, the 2002 World Summit focused on sustainable development in clean energy for natural gas (NG) and LPG. The research aims to focus on the important aspects of design sustainability from an environmental point of view to reduce gas leakage, accidents, and explosions that occur socially to expand the distribution of LPG and motivate the consumers to use it instead of natural gas and other fuels, and from an economic point of view to take into account the annual cost and aesthetic impact of maintaining on the view of the building and the design of the pipes in ways that do not distort the public view. The study area was a building in a residential complex in Baghdad and the gas pipelines were connected to the building completely for studying. The axes of sustainability were applied to the building in an analysis method using the goals achievement matrix, which is divided into main goals and secondary goals. The results showed that the environmental and aesthetic sustainability were well applied to the building, but from a social point of view, in the dissemination of safety instructions to the consumer, and from a financial point of view, there were shortcomings in them, and this could lead to long-term damage to the building.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":"31 1","pages":"248 - 255"},"PeriodicalIF":1.8,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42522783","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