Pub Date : 2017-04-30DOI: 10.52113/3/eng/mjet/2017-05-01/37-42
A. Atalla, A. M. Hammood
This paper aims to investigate the nonlinear dynamic analysis of prestressed concrete bridge girders subjected to impact loading from collision with over-height vehicles. Two cases with/without diaphragms are discussed. The FEM is used to model the prestressed bridge girders. It is assumed that vehicle load is to be in accordance to HS20 of AASHTO 2012 and its velocity is 40km/h. the impact load is modeled as horizontal forces applied at the lower edge of exterior girder at mid span. The addition of diaphragms is found to decrease the lateral and vertical displacements in the girders by up to 86.8% and 84.3%, respectively. A decrease in the longitudinal and vertical stresses by up to 50.6% and 65.8%, respectively is also noted.
{"title":"Nonlinear Analysis of Bridge Girders Subjected to Lateral Impact Loading","authors":"A. Atalla, A. M. Hammood","doi":"10.52113/3/eng/mjet/2017-05-01/37-42","DOIUrl":"https://doi.org/10.52113/3/eng/mjet/2017-05-01/37-42","url":null,"abstract":"This paper aims to investigate the nonlinear dynamic analysis of prestressed concrete bridge girders subjected to impact loading from collision with over-height vehicles. Two cases with/without diaphragms are discussed. The FEM is used to model the prestressed bridge girders. It is assumed that vehicle load is to be in accordance to HS20 of AASHTO 2012 and its velocity is 40km/h. the impact load is modeled as horizontal forces applied at the lower edge of exterior girder at mid span. The addition of diaphragms is found to decrease the lateral and vertical displacements in the girders by up to 86.8% and 84.3%, respectively. A decrease in the longitudinal and vertical stresses by up to 50.6% and 65.8%, respectively is also noted.","PeriodicalId":431983,"journal":{"name":"Muthanna Journal of Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127679990","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}
Pub Date : 2017-04-30DOI: 10.52113/3/eng/mjet/2017-05-01/27-36
{"title":"The Philosophy of Absence in contemporary Architecture","authors":"","doi":"10.52113/3/eng/mjet/2017-05-01/27-36","DOIUrl":"https://doi.org/10.52113/3/eng/mjet/2017-05-01/27-36","url":null,"abstract":"","PeriodicalId":431983,"journal":{"name":"Muthanna Journal of Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134415530","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}
Pub Date : 2017-04-30DOI: 10.52113/3/eng/mjet/2017-05-01/01-09
R. Atea
The objective of this study is to investigate the effect of silica fume and polypropylene fibers to gather on the mechanical properties of concrete and the improvement on general behaviour for deep reinforced concrete beams containing silica fume and polypropylene fibers. Properties studied include Silica fume content used was (0%, 10% and 20%) by replacement of equal weight of cement in concrete. Polypropylene fibers were added in (0%, 0.20% and 0.40%) by volume fraction of concrete. Totally three deep reinforced concrete beams specimens with cross-sectional dimension of (100X300)mmfor a length of 1000mm were tested. Out of which three beams provisional on the relation of shear span (a) to the active depth (d) .The (a/d) ratio was used (1) with different containing silica fume and polypropylene fibers with differents percentsge of replacement for silica fume and various Polypropylene fibers were addition from volume fraction.The experimental test results improved for toughened properties contain the compressive strength, splitting tensile strength and modulus of elasticity and also enhancement general behaviour for deep reinforced concrete beams when studied the crack patteren, load-deflection and strains.
{"title":"Improvement of Structural Properties for Reinforced Concrete Deep Beam using Silica Fume with Polypropylene Fibers","authors":"R. Atea","doi":"10.52113/3/eng/mjet/2017-05-01/01-09","DOIUrl":"https://doi.org/10.52113/3/eng/mjet/2017-05-01/01-09","url":null,"abstract":"The objective of this study is to investigate the effect of silica fume and polypropylene fibers to gather on the mechanical properties of concrete and the improvement on general behaviour for deep reinforced concrete beams containing silica fume and polypropylene fibers. Properties studied include Silica fume content used was (0%, 10% and 20%) by replacement of equal weight of cement in concrete. Polypropylene fibers were added in (0%, 0.20% and 0.40%) by volume fraction of concrete. Totally three deep reinforced concrete beams specimens with cross-sectional dimension of (100X300)mmfor a length of 1000mm were tested. Out of which three beams provisional on the relation of shear span (a) to the active depth (d) .The (a/d) ratio was used (1) with different containing silica fume and polypropylene fibers with differents percentsge of replacement for silica fume and various Polypropylene fibers were addition from volume fraction.The experimental test results improved for toughened properties contain the compressive strength, splitting tensile strength and modulus of elasticity and also enhancement general behaviour for deep reinforced concrete beams when studied the crack patteren, load-deflection and strains.","PeriodicalId":431983,"journal":{"name":"Muthanna Journal of Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128136898","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}
Pub Date : 2017-04-30DOI: 10.52113/3/eng/mjet/2017-05-01/16-21
{"title":"The Use of Crushed Brick Waste for The Internal Curing In Cement Mortar","authors":"","doi":"10.52113/3/eng/mjet/2017-05-01/16-21","DOIUrl":"https://doi.org/10.52113/3/eng/mjet/2017-05-01/16-21","url":null,"abstract":"","PeriodicalId":431983,"journal":{"name":"Muthanna Journal of Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122954540","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}
Pub Date : 2017-04-30DOI: 10.52113/3/eng/mjet/2017-05-01/10-15
H. Naeem
Powers compensation of the differential scanning calorimetry (DSC) have been utilized to revealed and analyze the phases of precipitations in the complex quaternary of Zinc (6.7wt. %) _ Magnesium (2.8 wt. %) _ Copper (1.8 wt. %) _Aluminum alloys manufactured by the process of the Semi-Direct Chill Casting. The casted Al-Zn-Mg-Cu alloys slabs were homogenizing at the different temperatures. Firstly under treatment 450°C for 2 hours follow by treatment 470°C for 1 day and then treatment at 480°C for 40 minutes, then all casted samples have quenched in cold water after each step. The treated homogenized Al-Zn-Mg-Cu samples that were underwent the artificial ageing at 120 °C for 1 day, and then retrogression at 180°C for 2400sec. and then reageing at 120°C for 1 day. The outcomes proved that the X-ray diffraction (XRD) analyses confirmed information of the DSC thermal analyses which were obtained through various heat treatments of the three samples AlZnMgCu alloy. The outcomes have explained that the DSC data are helping in understanding the changes the peaks of temperatures as well the enthalpy values for the forming and dissolution the equilibrium phase’s and precipitation compounds within the artificial againg (with the pea-temper) and the Retrograession and Re-Againg-(RRA) treatments were conducting for Al_Zn_Mg_Cu alloy samples.
{"title":"Study of Differential Scanning Calorimetry on Phase Precipitation in Various Heat Treatments of AlZnMgCu Aluminum Alloys","authors":"H. Naeem","doi":"10.52113/3/eng/mjet/2017-05-01/10-15","DOIUrl":"https://doi.org/10.52113/3/eng/mjet/2017-05-01/10-15","url":null,"abstract":"Powers compensation of the differential scanning calorimetry (DSC) have been utilized to revealed and analyze the phases of precipitations in the complex quaternary of Zinc (6.7wt. %) _ Magnesium (2.8 wt. %) _ Copper (1.8 wt. %) _Aluminum alloys manufactured by the process of the Semi-Direct Chill Casting. The casted Al-Zn-Mg-Cu alloys slabs were homogenizing at the different temperatures. Firstly under treatment 450°C for 2 hours follow by treatment 470°C for 1 day and then treatment at 480°C for 40 minutes, then all casted samples have quenched in cold water after each step. The treated homogenized Al-Zn-Mg-Cu samples that were underwent the artificial ageing at 120 °C for 1 day, and then retrogression at 180°C for 2400sec. and then reageing at 120°C for 1 day. The outcomes proved that the X-ray diffraction (XRD) analyses confirmed information of the DSC thermal analyses which were obtained through various heat treatments of the three samples AlZnMgCu alloy. The outcomes have explained that the DSC data are helping in understanding the changes the peaks of temperatures as well the enthalpy values for the forming and dissolution the equilibrium phase’s and precipitation compounds within the artificial againg (with the pea-temper) and the Retrograession and Re-Againg-(RRA) treatments were conducting for Al_Zn_Mg_Cu alloy samples.","PeriodicalId":431983,"journal":{"name":"Muthanna Journal of Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134441602","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}
Pub Date : 2017-04-30DOI: 10.52113/3/eng/mjet/2017-05-01/43-50
{"title":"Comparison Between the Optimal Application of Variable Structure Controller (VSC) and Power System Stabilizer (PSS) Using Particle Swarm Optimization (PSO) in Improving System Stability","authors":"","doi":"10.52113/3/eng/mjet/2017-05-01/43-50","DOIUrl":"https://doi.org/10.52113/3/eng/mjet/2017-05-01/43-50","url":null,"abstract":"","PeriodicalId":431983,"journal":{"name":"Muthanna Journal of Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128368171","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}
Pub Date : 2017-04-30DOI: 10.52113/3/eng/mjet/2017-05-01/22-26
Chemical machining is one of non traditional machining methods. It is necessary to study the main foundations of the process and the parameters affecting this process. In this research worked to reach the higher surface smoothness and lowest metal removal when a low carbon steel alloy was machined. Been using this alloy of chemically machined using etchant solution (Ferric chloride FeCl 3 ) .Factors that have been studied: machining time and concentration of etchant where three concentrations were studied (20, 40 and 60%). Each sample was machined by different times (1, 3, 5, 7 and 9 min).Metal removal rate was calculated depending on weight loss due to chemical machining based on corrosion mechanism. Performed tests hardness, surface roughness and an atomic force microscope examination of the surfaces of the samples chemically machined before the process and after it.Results showed
{"title":"Studying effect of static concentration for chemical machining on surface roughness and metal removal rate for low carbon steel","authors":"","doi":"10.52113/3/eng/mjet/2017-05-01/22-26","DOIUrl":"https://doi.org/10.52113/3/eng/mjet/2017-05-01/22-26","url":null,"abstract":"Chemical machining is one of non traditional machining methods. It is necessary to study the main foundations of the process and the parameters affecting this process. In this research worked to reach the higher surface smoothness and lowest metal removal when a low carbon steel alloy was machined. Been using this alloy of chemically machined using etchant solution (Ferric chloride FeCl 3 ) .Factors that have been studied: machining time and concentration of etchant where three concentrations were studied (20, 40 and 60%). Each sample was machined by different times (1, 3, 5, 7 and 9 min).Metal removal rate was calculated depending on weight loss due to chemical machining based on corrosion mechanism. Performed tests hardness, surface roughness and an atomic force microscope examination of the surfaces of the samples chemically machined before the process and after it.Results showed","PeriodicalId":431983,"journal":{"name":"Muthanna Journal of Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116340485","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}
Pub Date : 2016-06-30DOI: 10.52113/3/eng/mjet/2016-04-01/01-08
Huda M. Selman
Noise pollution around the Al-Muthanna university in Al-Samawah city was measured to study the effects on the teaching-learning processes and performance of both teachers and students during November and December 2014. Digital Sound Level Meter (model a GM1351 ) was used to measure the noise level, In twelve selected buildings for the study as indoor sites and the park and main door of the university as outdoor sites . The measurements at the buildings were carried out in three different time intervals of the day i.e. in the morning 8:00-10:00am, 10:00-12:00 pm and 12:00-2:00 pm. Noise intensity was also measured in two points at an interval of half hour .After recording of daily measurements of noise level, the hourly average noise level for each point of the building and for the whole buildings were calculated. As well as the total average of noise levels was calculated in order to compare it with the allowable limits of EPA for educational institutions. The maximum noise level was found in college of education (81.8) dBl and the minimum value in college of nursing which was equal(73.3) dBl. The study results show that the rate of noise level in an indoor and outdoor sites is very high and not suitable for teaching-learning processes. Therefore Acts and regulations concerning noise pollution should be strictly adopted.
{"title":"Investigation of Noise Levels Within Al-Muthanna University in Al-Muthanna Province Iraq","authors":"Huda M. Selman","doi":"10.52113/3/eng/mjet/2016-04-01/01-08","DOIUrl":"https://doi.org/10.52113/3/eng/mjet/2016-04-01/01-08","url":null,"abstract":"Noise pollution around the Al-Muthanna university in Al-Samawah city was measured to study the effects on the teaching-learning processes and performance of both teachers and students during November and December 2014. Digital Sound Level Meter (model a GM1351 ) was used to measure the noise level, In twelve selected buildings for the study as indoor sites and the park and main door of the university as outdoor sites . The measurements at the buildings were carried out in three different time intervals of the day i.e. in the morning 8:00-10:00am, 10:00-12:00 pm and 12:00-2:00 pm. Noise intensity was also measured in two points at an interval of half hour .After recording of daily measurements of noise level, the hourly average noise level for each point of the building and for the whole buildings were calculated. As well as the total average of noise levels was calculated in order to compare it with the allowable limits of EPA for educational institutions. The maximum noise level was found in college of education (81.8) dBl and the minimum value in college of nursing which was equal(73.3) dBl. The study results show that the rate of noise level in an indoor and outdoor sites is very high and not suitable for teaching-learning processes. Therefore Acts and regulations concerning noise pollution should be strictly adopted.","PeriodicalId":431983,"journal":{"name":"Muthanna Journal of Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126331001","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}
Pub Date : 2016-06-30DOI: 10.52113/3/eng/mjet/2016-04-01/51-56
H. Y. Aziz
The problem of this study is that the building of foundation by stones at the present time leads to develop cracks in the superstructure. Therefore, the solutions and the right manner were suggested for building the stone in the small and big structures. This paper studies using and properties of stones in building of foundations, that the stone is rigid and stiff in the same time very cheap for building, especially in the regions wealthy with stone. The models were taken for analyzing, firstly experimentally in the field site and secondly by Plaxis Program using the Finite Elements with the same properties of the soil and calculate the vertical displacement, vertical strain, factor of safety and bearing capacity. It can be concluded that the using of the reinforced columns in the small foundation in addition to the beam and stones will reduce the vertical displacement and strain to lower values, maintain high value of bearing capacity and increase the factor of safety that makes the structure becomes safer. Also for the big structures like bridges another models were used with higher loadings and the same above parameters were calculated, the stone with special requirements approved to improve and treat the soil parameters even for the big structures.
{"title":"Using of Stones in Building the Foundations","authors":"H. Y. Aziz","doi":"10.52113/3/eng/mjet/2016-04-01/51-56","DOIUrl":"https://doi.org/10.52113/3/eng/mjet/2016-04-01/51-56","url":null,"abstract":"The problem of this study is that the building of foundation by stones at the present time leads to develop cracks in the superstructure. Therefore, the solutions and the right manner were suggested for building the stone in the small and big structures. This paper studies using and properties of stones in building of foundations, that the stone is rigid and stiff in the same time very cheap for building, especially in the regions wealthy with stone. The models were taken for analyzing, firstly experimentally in the field site and secondly by Plaxis Program using the Finite Elements with the same properties of the soil and calculate the vertical displacement, vertical strain, factor of safety and bearing capacity. It can be concluded that the using of the reinforced columns in the small foundation in addition to the beam and stones will reduce the vertical displacement and strain to lower values, maintain high value of bearing capacity and increase the factor of safety that makes the structure becomes safer. Also for the big structures like bridges another models were used with higher loadings and the same above parameters were calculated, the stone with special requirements approved to improve and treat the soil parameters even for the big structures.","PeriodicalId":431983,"journal":{"name":"Muthanna Journal of Engineering and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131797185","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}
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