Journal of the Mechanical Behavior of Materials最新文献_第2页

Effect of surcharge load location on the behavior of cantilever retaining wall 附加荷载位置对悬臂挡土墙性能的影响

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2023-01-01 DOI: 10.1515/jmbm-2022-0247

Rowida S. Al-khafaji, M. A. Al-Obaydi, Qutayba N. Al-Saffar

{"title":"Effect of surcharge load location on the behavior of cantilever retaining wall","authors":"Rowida S. Al-khafaji, M. A. Al-Obaydi, Qutayba N. Al-Saffar","doi":"10.1515/jmbm-2022-0247","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0247","url":null,"abstract":"Abstract In this study, the effect of location of surcharge load on the stability and behavior of the retaining wall under static and dynamic load has been considered. A cantilever retaining wall of 7 m height retained dry sandy soil with 50 kN/m2 surcharge load. Several parameters were taken into account in the numerical analysis, including the horizontal distance (X) from the edge of the wall to the surcharge load expressed as a ratio to the heel width (X/Bh = 0, 0.25, 0.5, 0.75, and 1), as well as the effect of different values of the earthquake's horizontal component (kh = 0.1, 0.2, and 0.3). Lateral earth pressure distribution decreases with increase (X/B h ) in the upper one third of the wall. The effect of surcharge location at the top of the wall disappears at X/B h = 0.25. Under dynamic load, the maximum displacement at the top of the wall is obtained at X/B h = 0.5. It is increased by about 4 times at k h = 0.3. The possibility of sliding increases by about 4.8 times once the k h increases from 0.1 to 0.3. There is a maximum increase in rotation by 2 times at k h = 0.1. In the dynamic case, the differential settlement decreases with increase in X/B h , and increases with the increase in k h .","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45057596","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

Groundwater flow modeling and hydraulic assessment of Al-Ruhbah region, Iraq 伊拉克Al-Ruhbah地区地下水流量建模和水力评估

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2023-01-01 DOI: 10.1515/jmbm-2022-0214

Hanadi H. Zwain, B. Abed

{"title":"Groundwater flow modeling and hydraulic assessment of Al-Ruhbah region, Iraq","authors":"Hanadi H. Zwain, B. Abed","doi":"10.1515/jmbm-2022-0214","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0214","url":null,"abstract":"Abstract Al-Ruhbah region is located in the southwest of Najaf Governorate. A numerical model was created to simulate groundwater flow and analyze the water quality of the groundwater, by developing a conceptual model within the groundwater modeling system software. Nineteen wells were used, 15 for pumping and four for observation. A three-dimensional model was built based on the cross-sections indicating the geologic layers of the study area, which were composed of five layers. When a distance of 1,000 m between the wells was adopted, 135 wells can be operated simultaneously. These wells were hypothetically operated at 6, 12, and 18 h intervals, with a discharge of 200, 430, and 650 m3/day, respectively, and the maximum drawdowns of 12.5, 15, and 21 m were achieved. Water was also extracted from five wells in the study area to evaluate the quality of water for irrigation purposes and to characterize the type of water in these wells based on the Food and Agriculture Organization and Iraqi standards. The results of the laboratory tests revealed that the water suffers from different salinity concentrations, so for a large part of the study area, the water is suitable for some plants that can withstand high salt ranges between 3,000 and7,500 µc/cm.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43007522","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 lightweight expanded clay aggregate as partial replacement of coarse aggregate on the mechanical properties of fire-exposed concrete 轻质膨胀粘土集料部分替代粗集料对火灾暴露混凝土力学性能的影响

Journal of the Mechanical Behavior of Materials Pub Date : 2023-01-01 DOI: 10.1515/jmbm-2022-0299

Alaa H. Abdullah, Shatha D. Mohammed

{"title":"Effect of lightweight expanded clay aggregate as partial replacement of coarse aggregate on the mechanical properties of fire-exposed concrete","authors":"Alaa H. Abdullah, Shatha D. Mohammed","doi":"10.1515/jmbm-2022-0299","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0299","url":null,"abstract":"Abstract As aggregate material typically comprises 65–75% of concrete volume and has a significant effect on its mechanical properties, aggregate type considerably affects concrete behavior at high temperatures. In this study, 80 concrete cylinders and 60 cubes were cast to investigate the residual strength of normal concrete that contains lightweight expanded clay aggregate (LECA) with different volumetric replacement ratios (0, 10, 20, and 30%) of the coarse aggregate. After the fire flame exposure effect of steady-state temperatures (300, 400, 500, and 600°C), and a sudden cooling process, the mechanical tests (compressive strength, tensile strength, and modulus of elasticity; Ec), as well as mass loss and thermal conductivity, were carried out on the specimens. The results indicate that increasing the LECA content in the mixture leads to better strength retention after exposure to fire. After exposure to a steady-state temperature of 600°C, the amount of decrease in mass, residual compressive and tensile strengths, and the residual amount of Ec were 7.61, 7.5, 7.16, and 6.24%; 57.1, 66.8, 69.8, and 72.0%; 22.4, 32.7, 41.8, and 48.6%;, and 16.0, 22.3, 23.4, and 24.3%, respectively, for the considered volumetric replacement ratios of 0, 10, 20, and 30%. Also, the values of the thermal conductivity were 1.4889, 1.1667, 1.0912, and 1.0410 W/m K, respectively.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135361934","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

Utilization of nanoparticles and waste materials in cement mortars 纳米颗粒与废材料在水泥砂浆中的应用

Journal of the Mechanical Behavior of Materials Pub Date : 2023-01-01 DOI: 10.1515/jmbm-2022-0289

Haider M. Owaid, Abeer M. Humad, Majid Al-Gburi, Zainab Abdul Sattar Ghali, Gabrial Sas

{"title":"Utilization of nanoparticles and waste materials in cement mortars","authors":"Haider M. Owaid, Abeer M. Humad, Majid Al-Gburi, Zainab Abdul Sattar Ghali, Gabrial Sas","doi":"10.1515/jmbm-2022-0289","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0289","url":null,"abstract":"Abstract Cement has shaped the modern built environment, but its production generates substantial carbon dioxide emissions. Consequently, there is an urgent need to identify alternative cementitious building materials for sustainable construction. In this study, cement mortars (CMs) were produced by partially replacing cement with nanoclay (NC) and granite dust (GD). The replacement proportions (% by weight of cement) of these materials were 1.5, 3, and 4.5% for NC and 10, 20, and 30% for GD. For mortars containing NC but not GD, the strength was maximized when the NC replacement proportion was 3%. To evaluate the combined effect of partially replacing cement with both NC and GD on the fresh and hardening properties of cement-blended mortars, ternary binder mixtures containing 3% NC together with 10, 20, or 30% GD were prepared, and their workability, bulk density, compressive strength (at 7, 28, and 90 days), and flexural strength were measured. Increasing the content of NC and/or GD reduced the flowability of these mortars relative to that of the reference mortar mix because it increased the content of fine materials. CM containing 3% NC and 10% GD had the highest compressive strength at 7, 28, and 90 days while also having the greatest flexural strength when compared to the control mix. This is most likely due to the high silica and alumina content of NC and GD, as well as their high specific surface area, which would improve the maturity and density of the matrix when compared to cement alone.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135556240","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

Influence of flexoelectric effect on the bending rigidity of a Timoshenko graphene-reinforced nanorod 挠曲电效应对Timoshenko石墨烯增强纳米棒弯曲刚度的影响

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2023-01-01 DOI: 10.1515/jmbm-2022-0295

S. Nevhal, M. Gupta, S. I. Kundalwal

引用次数: 0

Numerical modeling of connected piled raft foundation under seismic loading in layered soils 层状土中地震荷载作用下连接桩筏基础数值模拟

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2023-01-01 DOI: 10.1515/jmbm-2022-0250

A. Ali, M. Karkush, Ala Nasir Aljorany

{"title":"Numerical modeling of connected piled raft foundation under seismic loading in layered soils","authors":"A. Ali, M. Karkush, Ala Nasir Aljorany","doi":"10.1515/jmbm-2022-0250","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0250","url":null,"abstract":"Abstract Until recently, the behavior of connected piled raft foundation was not fully understood in the seismically active region due to the complex dynamic soil–pile–foundation structure interaction. This concern arises when the soil deposit-supported foundations are stratified or heterogynous and subjected to high ground motion intensity. In the current study, a series of numerical analyses using ABAQUS software have been conducted on a pile group of (3 × 3) arranged into a square pattern to investigate the seismic response of piled foundations embedded in dry sandy soil (homogenous and layered), and how the amplification of propagated waves affects the bending moment along piles. For mesh generation, an artificial boundary condition using the tied-nodes approach was adopted to simulate the free-field motion of soil under earthquake excitation. The structure used a single degree of freedom with a lumped mass. Moreover, Mohr–Coulomb and linear elastic models have been chosen for soil and pile–raft, respectively. The results demonstrate that the foundation rocking increases in stratified soil compared to homogenous soil, irrespective of the seismic intensity. The maximum bending moment was observed at the pile head in homogenous soil and shallow depths in layered soil because of the kinematic interaction at the soil interface. The results also indicated that the amplification factor (acceleration at a certain depth to the acceleration at bedrock) was found to be 203 and 189% in homogenous soil for PGA values of 0.1 and 0.33 g, respectively. Almost there were no effects of seismic intensity in layered soil on the amplified waves transmitted into the soil surface.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42604578","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

Nonlinear-finite-element analysis of reactive powder concrete columns subjected to eccentric compressive load 活性粉末混凝土偏心受压柱的非线性有限元分析

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2023-01-01 DOI: 10.1515/jmbm-2022-0267

Suaad Khaleel I. Al-Fadhli

{"title":"Nonlinear-finite-element analysis of reactive powder concrete columns subjected to eccentric compressive load","authors":"Suaad Khaleel I. Al-Fadhli","doi":"10.1515/jmbm-2022-0267","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0267","url":null,"abstract":"Abstract Studies on the behavior of reactive powder concrete (RPC) columns under eccentric loading are limited. The effect of materials used in manufacturing these RPC columns has not yet been investigated. This research aimed to perform a nonlinear-finite-element analysis to determine the load-carrying capacity and displacement of RPC columns made of different RPC mixes and subjected to various loading eccentricities. This research investigates two types of parameters. The first parameter is the column’s geometric parameters (the height L and the load eccentricity distance e). The second is the RPC material parameter (regarding the silica fume or fly ash used as pozzolanic material and the type of fibers used, whether steel or glass fiber). Results indicate that eccentric-loaded slender columns exhibit much less load-carrying capacity than the corresponding short columns. The 2 m-long columns with eccentricity ratio e/t = 0.2 resulted in a 65% average reduction in the ultimate load (Pu) compared to the corresponding 1 m-long columns. Using fly ash as a pozzolanic material instead of silica fume reduces the ultimate load (Pu) of an RPC column by an average of 60%. Using glass fibers instead of steel fibers also reduced Pu by 50%. The average percentage increase in the maximum vertical deflection (Δy max) of the short column (L = 1 m) is found in the range of 18–31% for eccentricity ratio e/t = 0.1 but 45–69% for e/t = 0.2. In contrast, for a slender column (L = 2 m), the percentage increase in Δy max is in the range of 10–30% for both e/t = 0.1 and 0.2.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43851241","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

Efficiency of CFRP torsional strengthening technique for L-shaped spandrel reinforced concrete beams CFRP扭转加固技术对L型拱肩钢筋混凝土梁的加固效果

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2023-01-01 DOI: 10.1515/jmbm-2022-0243

Noor Ayaad, N. Oukaili

{"title":"Efficiency of CFRP torsional strengthening technique for L-shaped spandrel reinforced concrete beams","authors":"Noor Ayaad, N. Oukaili","doi":"10.1515/jmbm-2022-0243","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0243","url":null,"abstract":"Abstract The present study aims to get experimentally a deeper understanding of the efficiency of carbon fiber-reinforced polymer (CFRP) sheets applied to improve the torsional behavior of L-shaped reinforced concrete spandrel beams in which their ledges were loaded in two stages under monotonic loading. An experimental program was conducted on spandrel beams considering different key parameters including the cross-sectional aspect ratio (i.e., web height/web thickness), and the availability of the CFRP strengthening system. The ledge of the spandrel beams was exposed during testing to a very high eccentric load, which was transferred to the web of the spandrel beam causing high shear, torsion, and bending moments. Consequently, the applied load resulted in in-plane and out-of-plane deformations of the web accompanied by flexural and shear cracks. This article demonstrates the advantage of using CFRP sheets to strengthen the mentioned members. The applied CFRP sheets increased the failure torsional load by about 37% compared to the identical L-spandrels without strengthening. The outcomes indicate that using CFRP sheets show improvement in restricting the deflections and rotation of L-spandrels due to increasing spandrel stiffness. The reduction in the degree of rotation attained more than 33% in comparison to the spandrel beams without strengthening. The experimental program confirmed the applicability of the proposed strengthening technique for compacted and slender L-shaped spandrel-reinforced concrete beams.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45282643","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

Simulation and assessment of water supply network for specified districts at Najaf Governorate 纳杰夫省指定地区供水网络模拟与评价

IF 1.8

Journal of the Mechanical Behavior of Materials Pub Date : 2023-01-01 DOI: 10.1515/jmbm-2022-0233

H. Al-Mousawey, B. Abed

{"title":"Simulation and assessment of water supply network for specified districts at Najaf Governorate","authors":"H. Al-Mousawey, B. Abed","doi":"10.1515/jmbm-2022-0233","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0233","url":null,"abstract":"Abstract This study aims to simulate and assess the hydraulic characteristics and residual chlorine in the water supply network of a selected area in Al-Najaf City using WaterGEMS software. Field and laboratory work were conducted to measure the pressure heads and velocities, and water was sampled from different sites in the network and then tested to estimate chlorine residual. Records and field measurements were utilized to validate WaterGEMS software. Good agreement was obtained between the observed and predicted values of pressure with RMSE range between 0.09–0.17 and 0.08–0.09 for chlorine residual. The results of the analysis of water distribution systems (WDS) during maximum demand hours showed that the pumps unit capability cannot cover the high water demand during that time and resulted in a loss of pressure values, which were ranged between 0.2 and 2.1 bar. Moreover, the simulated results of the residual chlorine levels were within the permissible limits of 0.4–0.7 ppm, in different locations in the network. Providing good quality and adequate water supply is an important component for human life development. Modeling WDS is an efficient method of gaining a true understanding of the functioning of the network and determining the factors and conditions affecting the performance of the network.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":" ","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49193872","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

Investigation of the performance of integrated intelligent models to predict the roughness of Ti6Al4V end-milled surface with uncoated cutting tool 综合智能模型预测Ti6Al4V无涂层刀具端面粗糙度的性能研究

Journal of the Mechanical Behavior of Materials Pub Date : 2023-01-01 DOI: 10.1515/jmbm-2022-0300

Salah Al-Zubaidi, Jaharah A. Ghani, Che Hassan Che Haron, Adnan Naji Jameel Al-Tamimi, M. N. Mohammed, Alessandro Ruggiero, Samaher M. Sarhan, Oday I. Abdullah, Mohd Shukor Salleh

{"title":"Investigation of the performance of integrated intelligent models to predict the roughness of Ti6Al4V end-milled surface with uncoated cutting tool","authors":"Salah Al-Zubaidi, Jaharah A. Ghani, Che Hassan Che Haron, Adnan Naji Jameel Al-Tamimi, M. N. Mohammed, Alessandro Ruggiero, Samaher M. Sarhan, Oday I. Abdullah, Mohd Shukor Salleh","doi":"10.1515/jmbm-2022-0300","DOIUrl":"https://doi.org/10.1515/jmbm-2022-0300","url":null,"abstract":"Abstract Titanium alloys are broadly used in the medical and aerospace sectors. However, they are categorized within the hard-to-machine alloys ascribed to their higher chemical reactivity and lower thermal conductivity. This aim of this research was to study the impact of the dry-end-milling process with an uncoated tool on the produced surface roughness of Ti6Al4V alloy. This research aims to study the impact of the dry-end milling process with an uncoated tool on the produced surface roughness of Ti6Al4V alloy. Also, it seeks to develop a new hybrid neural model based on the training back propagation neural network (BPNN) with swarm optimization-gravitation search hybrid algorithms (PSO-GSA). Full-factorial design of the experiment with L27 orthogonal array was applied, and three end-milling parameters (cutting speed, feed rate, and axial depth of cut) with three levels were selected (50, 77.5, and 105 m/min; 0.1, 0.15, and 0.2 mm/tooth; and 1, 1.5, and 2 mm) and investigated to show their influence on the obtained surface roughness. The results revealed that the surface roughness is significantly affected by the feed rate followed by the axial depth. A 0.49 µm was produced as a minimum surface roughness at the optimized parameters of 105 m/min, 0.1 mm/tooth, and 1 mm. On the other hand, a neural network having a single hidden layer with 1–20 hidden neurons, 3 input neurons, and 1 output neuron was trained with both PSO and PSO–GSA algorithms. The hybrid BPNN–PSO–GSA model showed its superiority over the BPNN–PSO model in terms of the minimum mean square error (MSE) that was calculated during the testing stage. The best BPNN–PSO–GSA hybrid model was the 3–18–1 structure, which reached the best testing MSE of 3.8 × 10 −11 against 2.42 × 10 −5 of the 3–8–1 BPNN–PSO hybrid model.","PeriodicalId":17354,"journal":{"name":"Journal of the Mechanical Behavior of Materials","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135561114","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