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2D equivalent linear ground response analysis for randomized site profiles 随机场地剖面的二维等效线性地面响应分析
Pollack Periodica Pub Date : 2024-05-02 DOI: 10.1556/606.2024.00995
A. Chala, Richard Ray
{"title":"2D equivalent linear ground response analysis for randomized site profiles","authors":"A. Chala, Richard Ray","doi":"10.1556/606.2024.00995","DOIUrl":"https://doi.org/10.1556/606.2024.00995","url":null,"abstract":"Local soil conditions play a crucial role in shaping ground surface responses and impacting the intensity of ground shaking. In this study, the influence of different site profiles on computed ground motion was investigated using a 2D equivalent linear analysis approach. Four distinct site profiles: sand, clay, sand-clay-sand-clay, and clay-sand-clay-sand profiles were considered. The results were presented using multiple metrics, including surface acceleration, displacement, modulus decreasing ratio, and coherence analysis. Notably, the clay profile significantly influenced ground motion, while the sand profile exhibited relatively lower seismic activity. This suggests that softer sites significantly influence ground motion, leading to potentially high levels of shaking.","PeriodicalId":35003,"journal":{"name":"Pollack Periodica","volume":"20 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141020191","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
Microstructural and profilometric analysis of thermally sprayed cylinder wall coatings 热喷涂气缸壁涂层的微观结构和轮廓分析
Pollack Periodica Pub Date : 2024-05-02 DOI: 10.1556/606.2024.01076
Akos Kokai, Maria Berkes Maros
{"title":"Microstructural and profilometric analysis of thermally sprayed cylinder wall coatings","authors":"Akos Kokai, Maria Berkes Maros","doi":"10.1556/606.2024.01076","DOIUrl":"https://doi.org/10.1556/606.2024.01076","url":null,"abstract":"Cylinder bore coatings are widely used in automotive internal combustion engines to replace cylinder liners. During the atmospheric plasma spraying process, the coatings are oxidized and controlled by the Si content of the steel powder used as the coating raw material. This phenomenon affects the technological process, the microstructure, and the properties of the formed coatings. The research aims to investigate how the Si content of two commercial grades of steel powder commonly used in industry affects the undesirable consequences observed in practice, such as clogging of powder nozzles or large variations in coating hardness. The analyses and industrial experiments show that increasing the Si content can contribute significantly to these undesirable phenomena.","PeriodicalId":35003,"journal":{"name":"Pollack Periodica","volume":"93 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141019268","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
Seismic evaluation of steel beam-column connection equipped by circular slit dampers 配备圆形缝隙阻尼器的钢梁-钢柱连接的抗震评估
Pollack Periodica Pub Date : 2024-04-22 DOI: 10.1556/606.2024.00996
Alaa T. Mohammed, H. Sultan
{"title":"Seismic evaluation of steel beam-column connection equipped by circular slit dampers","authors":"Alaa T. Mohammed, H. Sultan","doi":"10.1556/606.2024.00996","DOIUrl":"https://doi.org/10.1556/606.2024.00996","url":null,"abstract":"This study evaluates metallic yield dampers, specifically slit steel dampers, for protecting steel beam-to-column connections during seismic events. Finite element model simulations were conducted for the damper and its connection. Analysis of circular parameters, like the radius slot, showed that appropriately sized slit dampers exhibit advantageous seismic behavior. Moment-rotation, hysteresis curves, and plastic stresses comparisons indicate efficient energy absorption. The maximum moment was 25% lower than conventional samples. The slit steel damper model with a ductility factor of 3.5 allows significant plastic deformation before potential failure. Results emphasize the slit damper's potential for optimal performance in steel frames, suggesting its use for efficient energy absorption.","PeriodicalId":35003,"journal":{"name":"Pollack Periodica","volume":"11 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140673877","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 heat input and preheating on residual stresses in pipe weld 热输入和预热对管道焊接残余应力的影响
Pollack Periodica Pub Date : 2024-04-15 DOI: 10.1556/606.2023.00589
Mahmood Alhafadhi, Masar Alsigar, Oudah Zahraa A., Z. Bézi, Alden abd alal Sahm, P. R. Reddy
{"title":"Influence of heat input and preheating on residual stresses in pipe weld","authors":"Mahmood Alhafadhi, Masar Alsigar, Oudah Zahraa A., Z. Bézi, Alden abd alal Sahm, P. R. Reddy","doi":"10.1556/606.2023.00589","DOIUrl":"https://doi.org/10.1556/606.2023.00589","url":null,"abstract":"Using finite element methods, residual stresses were estimated in pipe welds. Experiments were also conducted to verify the numerical results. An alternative to a three-dimensional model was used to simplify the numerical calculation for residual stresses investigation. Model predictions were validated by measuring residual stresses using X-ray diffraction. As compared to measured residual stress distributions, the computational approaches developed in this study can accurately predict welding residual stress distributions. The focused welding parameters have a significant impact on residual stresses even when all the other parameters are the same.","PeriodicalId":35003,"journal":{"name":"Pollack Periodica","volume":"46 41","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140701885","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
Aerodynamic parameters of buildings at different floors in the immediate vicinity 附近不同楼层建筑物的空气动力参数
Pollack Periodica Pub Date : 2024-03-12 DOI: 10.1556/606.2023.00950
O. Voznyak, Edyta Dudkiewicz, N. Spodyniuk, O. Dovbush, I. Sukholova, Olena Savchenko, M. Kasynets
{"title":"Aerodynamic parameters of buildings at different floors in the immediate vicinity","authors":"O. Voznyak, Edyta Dudkiewicz, N. Spodyniuk, O. Dovbush, I. Sukholova, Olena Savchenko, M. Kasynets","doi":"10.1556/606.2023.00950","DOIUrl":"https://doi.org/10.1556/606.2023.00950","url":null,"abstract":"The immediate vicinity of buildings of different floors causes damages of the smoke and ventilation channels work of the low-rise buildings. This is dangerous for the resident's health and lives. To determine the impact of high-rise buildings on the operation of air channels of a nearby two-story building, experimental research has been carried out in a wind tunnel. Charts and analytical formulas have been designed for determining the buildings aerodynamic coefficients depending on wind directions and the channels height. An increase of the channel height results in an increase in static rarefaction in smoke and ventilation channels. Increasing rarefaction increases the efficiency of the natural ventilation system and ensures the residents health and life.","PeriodicalId":35003,"journal":{"name":"Pollack Periodica","volume":"264 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140249401","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
Strength prediction of modified self-compacting concrete using response surface method 利用响应面法预测改性自密实混凝土的强度
Pollack Periodica Pub Date : 2024-03-01 DOI: 10.1556/606.2023.00948
B. Udayasree, Avuthu Narender Reddy, Yadav Suvidha, Prathik Kulkarni, C. A. Kumar, Bodevenkata Kavyatheja
{"title":"Strength prediction of modified self-compacting concrete using response surface method","authors":"B. Udayasree, Avuthu Narender Reddy, Yadav Suvidha, Prathik Kulkarni, C. A. Kumar, Bodevenkata Kavyatheja","doi":"10.1556/606.2023.00948","DOIUrl":"https://doi.org/10.1556/606.2023.00948","url":null,"abstract":"This study highlights the effectiveness of the response surface method in predicting the properties of hardened concrete containing spent foundry sand and manufactured-sand. In current research, different mix proportions are prepared with spent foundry sand and manufactured-sand as partial replacements for fine aggregate. The workability, strength, and durability studies are conducted on all concrete mixes. The test results confirm that the inclusion of 20% of spent foundry sand is optimum for enhancing the strength and durability. Also, the inclusion of 20% of spent foundry sand in manufactured-sand concrete also possesses optimum results in strength and durability. Further, the response surface method has been employed to develop a model for compressive strength prediction. The R-squared and residual sum of squares of error for the compressive strength model were 0.9863 and 2.345, which confirms the goodness of the fit.","PeriodicalId":35003,"journal":{"name":"Pollack Periodica","volume":"49 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140087470","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
Enhancing pier local scour prediction in the presence of floating debris 在有漂浮物的情况下加强码头局部冲刷预测
Pollack Periodica Pub Date : 2024-02-20 DOI: 10.1556/606.2023.00952
Muhanad Al-Jubouri, Richard P. Ray
{"title":"Enhancing pier local scour prediction in the presence of floating debris","authors":"Muhanad Al-Jubouri, Richard P. Ray","doi":"10.1556/606.2023.00952","DOIUrl":"https://doi.org/10.1556/606.2023.00952","url":null,"abstract":"Local scour poses a grave threat to bridge foundations, potentially causing catastrophic collapses. This study uses FLOW-3D with the Reynolds-Averaged Navier-Stokes model to analyze pier scour and dune formation under bridges. It focuses on submerged debris shapes near the water's surface. Results closely match experiments when specific conditions are met. The study introduces an innovative approach to debris impact assessment. Instead of traditional methods, it proposes a novel equation accounting for debris's effective area and elevation. This enhances reliability by over 20%, improving scour depth assessment in debris-laden scenarios. This advances the understanding of debris's role in local scour, benefiting bridge design and management practices.","PeriodicalId":35003,"journal":{"name":"Pollack Periodica","volume":"204 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140448732","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
LMI feasibility analysis of 2DOF NATA model 2DOF NATA 模型的 LMI 可行性分析
Pollack Periodica Pub Date : 2024-02-19 DOI: 10.1556/606.2024.00888
A. Wéber, M. Kuczmann
{"title":"LMI feasibility analysis of 2DOF NATA model","authors":"A. Wéber, M. Kuczmann","doi":"10.1556/606.2024.00888","DOIUrl":"https://doi.org/10.1556/606.2024.00888","url":null,"abstract":"Present paper shows the different types of tensor product model based linear matrix inequality controller design and feasibility analysis of two degrees of freedom aeroelastic wing section model. The tensor product models are based on reducing or removing the nonlinear behavior of the system and weighting functions. The linear matrix inequality based method results globally asymptotically stable system. The goal of the paper is to examine that selecting and varying the transformation space influences the feasibility of the linear matrix inequality based controller. The paper gives a comparison between the different tensor product models in terms of controller performance. The linear matrix inequality gives feasible solution for the controller design if the transformation space is selected adequately.","PeriodicalId":35003,"journal":{"name":"Pollack Periodica","volume":"17 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140450752","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
Comparative analysis of microchannel heat sinks for thermal performance enhancement 提高散热性能的微通道散热器比较分析
Pollack Periodica Pub Date : 2024-02-14 DOI: 10.1556/606.2023.00989
Dhay Abd Al Hasan Jawad, S. Ahmed
{"title":"Comparative analysis of microchannel heat sinks for thermal performance enhancement","authors":"Dhay Abd Al Hasan Jawad, S. Ahmed","doi":"10.1556/606.2023.00989","DOIUrl":"https://doi.org/10.1556/606.2023.00989","url":null,"abstract":"This study evaluated the thermal performance of side divergence and uniform micro-channel heat sinks by comparing and contrasting them. Heat transfer and fluid flow characteristics in these micro-channel configurations were studied using computational fluid dynamics simulations employing ANSYS Fluent 2017 code for this purpose. Laminar flow through micro-channels with a Reynolds number of 207 was the subject of the investigation. The goal is to determine how side divergence affects heat dissipation efficiency concerning traditional uniform micro-channels. The results showed that the best divergence ratio is 1.5 that achieved the highest performance. The study also revealed that side divergence micro-channel heat sinks can achieve thermal performance up to 14% higher than uniform micro-channel heat sinks.","PeriodicalId":35003,"journal":{"name":"Pollack Periodica","volume":"43 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139838455","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 effect of anti-slip aggregate and silica fume on polymer-modified concrete 抗滑骨料和硅灰对聚合物改性混凝土的影响
Pollack Periodica Pub Date : 2024-02-14 DOI: 10.1556/606.2023.00958
Maher F. Al Lebban, Ameer A. Alraie, Q. A. Jabal, Laith Abdul Rasool Alasadi, Rawa Shakir Muwashee, W. H. Mahdi
{"title":"The effect of anti-slip aggregate and silica fume on polymer-modified concrete","authors":"Maher F. Al Lebban, Ameer A. Alraie, Q. A. Jabal, Laith Abdul Rasool Alasadi, Rawa Shakir Muwashee, W. H. Mahdi","doi":"10.1556/606.2023.00958","DOIUrl":"https://doi.org/10.1556/606.2023.00958","url":null,"abstract":"Progress in building construction requires more durable concrete with higher strength. Polymer and water reducer liquids can improve concrete strength and durability. This research aims to improve the mechanical properties of polymer-modified concrete by using anti-slip sand and silica fume to achieve more durable concrete against sulfate attack and higher mechanical properties. The study shows an increase in compressive strength from 25.7 MPa for reference mix to 45.5 MPa using 15% silica fume and 30% Anti-slip sand; tensile strength increased from 2.72 to 4.4 MPa. Flexural strength also increased, and durability to sulfate attack also increased. The study includes the increment of durability against freezing-thawing cycles for different mixes.","PeriodicalId":35003,"journal":{"name":"Pollack Periodica","volume":"66 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139779126","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
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