Mathematical Modelling in Civil Engineering最新文献_第2页

The Influence of Mass Loss on Wooden Elements Case Study 质量损失对木制构件影响的实例研究

Mathematical Modelling in Civil Engineering Pub Date : 2018-12-01 DOI: 10.2478/mmce-2018-0009

I. Teodorescu

引用次数: 0

Modeling and Analyzing the Factors Affecting the Mortality of Pedestrians in Urban Accidents 城市交通事故中行人死亡影响因素建模与分析

Mathematical Modelling in Civil Engineering Pub Date : 2018-12-01 DOI: 10.2478/mmce-2018-0010

Ahmet Tortum, Alireza Motamadnia

{"title":"Modeling and Analyzing the Factors Affecting the Mortality of Pedestrians in Urban Accidents","authors":"Ahmet Tortum, Alireza Motamadnia","doi":"10.2478/mmce-2018-0010","DOIUrl":"https://doi.org/10.2478/mmce-2018-0010","url":null,"abstract":"Abstract The nature of urban and rural accidents has been different from each other in some of the factors and even the severity of damage rate, mayhem, and death. In this research, using statistical methods and binary logistic regression model, we have addressed to analyze important parameters such as age, gender, education level, the color of the pedestrian dress, season of accident, time of accident, the speed of the vehicle colliding with pedestrians and road surface conditions at the time of accident on the way of death (at the scene of the incident or in the hospital) pedestrians who have been traumatized. After the creation of the binary logistic regression model, it was determined that only the parameters of speed and the accident time have been significant in the level less than 5%. And other parameters such as age, gender, the season of accident occurrence, the color of the pedestrian dress, road surface conditions and education level had no significant effect in terms of statistical on the incidence of mortality arising from a pedestrian accident with the motor vehicle. The results revealed that by adopting decisions related to the traffic calming, attention to passages lighting and brightness the mortality rate of a pedestrian due to the urban accidents can be reduced.","PeriodicalId":233081,"journal":{"name":"Mathematical Modelling in Civil Engineering","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130992207","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

Prediction of Swelling Parameters of Two Clayey Soils from Algeria Using Artificial Neural Networks 阿尔及利亚两种粘性土膨胀参数的人工神经网络预测

Mathematical Modelling in Civil Engineering Pub Date : 2018-09-01 DOI: 10.2478/mmce-2018-0008

Fatima Zohra Merouane, S. Mamoune

{"title":"Prediction of Swelling Parameters of Two Clayey Soils from Algeria Using Artificial Neural Networks","authors":"Fatima Zohra Merouane, S. Mamoune","doi":"10.2478/mmce-2018-0008","DOIUrl":"https://doi.org/10.2478/mmce-2018-0008","url":null,"abstract":"Abstract The phenomenon of swelling is one of the more complicated geotechnical problems that the engineer have to deal with. However, its quantification is essential for the design of structures and various methods can be applied to the identification of this phenomenon. Some, such as mineralogical identification and direct measurements of swelling, are more or less long and require very specific equipment. However, there are other methods that offer the advantage of being relatively fast and lesser expensive: they are based on soil mechanics parameters. Using these parameters, several authors have introduced soil swelling prediction models, mostly in the form of classifications and empirical formulas. This work concerns in the first part the identification and classification of the swelling potential of two clays located in north-western Algeria. Followed by a statistical analysis carried out to test the reliability of the observations for the estimation of the pressure and the swelling amplitude using a multiple linear regression. A second part is devoted to the development of a prediction method by artificial neural networks allowing the estimation of swelling parameters (pressure and amplitude) by minimizing the difference between the experimental measurements and the numerical results. Modeling by artificial neural networks is of great interest in the field of prediction. The application of two networks makes it possible to obtain good forecasts of the swelling parameters.","PeriodicalId":233081,"journal":{"name":"Mathematical Modelling in Civil Engineering","volume":"565 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116252754","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 Campaign and Analysis on Double-Shear Wooden Connections 双剪力木连接的试验研究与分析

Mathematical Modelling in Civil Engineering Pub Date : 2018-09-01 DOI: 10.2478/mmce-2018-0007

I. Teodorescu

引用次数: 0

Fire Safety Evaluation of an Underground Car Park Using Numerical Simulation 基于数值模拟的地下停车场消防安全评价

Mathematical Modelling in Civil Engineering Pub Date : 2018-06-01 DOI: 10.2478/mmce-2018-0003

D. Burlacu, I. Anghel, C. Popa, Ionuţ Căşaru

引用次数: 4

A State Space Formulation for the Evaluation of the Pounding Forces During Earthquake 地震冲击力评价的状态空间公式

Mathematical Modelling in Civil Engineering Pub Date : 2018-06-01 DOI: 10.2478/mmce-2018-0006

G. Nica, V. Calofir, I. Corâci

{"title":"A State Space Formulation for the Evaluation of the Pounding Forces During Earthquake","authors":"G. Nica, V. Calofir, I. Corâci","doi":"10.2478/mmce-2018-0006","DOIUrl":"https://doi.org/10.2478/mmce-2018-0006","url":null,"abstract":"Abstract In recent years, the pounding effect during earthquake is a subject of high significance for structural engineers. In this paper, a state space formulation of the equation of motion is used in a MATLAB code. The pounding forces are calculated using nonlinear viscoelastic impact element. The numerical study is performed on SDOF structures subjected by 1940 EL-Centro and 1977 Vrancea N-S recording. While most of the studies available in the literature are related to Newmark implicit time integration method, in this study the equations of motion in state space form are direct integrated. The time domain is chosen instead of the complex one in order to catch the nonlinear behavior of the structures. The physical nonlinear behavior of the structures is modeled according to the Force Analogy Method. The coupling of the Force Analogy Method with the state space approach conducts to an explicit time integration method. Consequently, the collision is easily checked and the pounding forces are taken into account into the equation of motion in an easier manner than in an implicit integration method. A comparison with available data in the literature is presented.","PeriodicalId":233081,"journal":{"name":"Mathematical Modelling in Civil Engineering","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115717784","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: 6

Prediction of Scour Depth Around Bridge Piers Using Evolutionary Neural Network 基于进化神经网络的桥墩周围冲刷深度预测

Mathematical Modelling in Civil Engineering Pub Date : 2018-06-01 DOI: 10.2478/mmce-2018-0005

A. Ismail

引用次数: 3

Performance of the Tube Settler Clarification at Different Inclination Angles and Variable Flow Rate 不同倾角和变流量下管式沉降器澄清性能研究

Mathematical Modelling in Civil Engineering Pub Date : 2018-06-01 DOI: 10.2478/mmce-2018-0004

Sofyan Al-Dulaimi, G. Racovițeanu

{"title":"Performance of the Tube Settler Clarification at Different Inclination Angles and Variable Flow Rate","authors":"Sofyan Al-Dulaimi, G. Racovițeanu","doi":"10.2478/mmce-2018-0004","DOIUrl":"https://doi.org/10.2478/mmce-2018-0004","url":null,"abstract":"Abstract Sedimentation tanks are a major and important component of the wastewater treatment plants, where the cost of construction for traditional tanks may represent up to 30% of the total cost of the plants, as well as sedimentation tanks occupy relatively large areas and often require long retention times to separate the suspended solids from the liquid. High-rate tube settlers are one of the practical solutions for the development of treatment plants, especially sedimentation tanks, lamella systems can be used instead of conventional sedimentation basins or for upgrade and increase their capacity and efficiency. In addition to their high efficiency, they require much less space compared to conventional sedimentation tanks. The current study was developed to evaluate the performance of the tube settler and the effect of the inclination of tube settler on the effluent quality. In the practical experiments, tube settler unit consisting of four separate circular tubes of 27 mm inner diameter, with a length of 150 cm each were used at different inclination angles of 48, 54 and 60 degrees. A pilot scale model of coagulation-flocculation followed by sedimentation unit was prepared & installed at Colentina Laboratory Complex-UTCB for this purpose.","PeriodicalId":233081,"journal":{"name":"Mathematical Modelling in Civil Engineering","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132077895","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

Aspects of Water Budget in Văcăreşti Wetland 垂垂垂垂湿地水收支的几个方面

Mathematical Modelling in Civil Engineering Pub Date : 2018-03-01 DOI: 10.2478/mmce-2018-0002

V. Zaharia, D. Gaitanaru

引用次数: 1

Fourier Sine Transform Method for Solving the Cerrutti Problem of the Elastic Half Plane in Plane Strain 求解平面应变中弹性半平面Cerrutti问题的傅里叶正弦变换方法

Mathematical Modelling in Civil Engineering Pub Date : 2018-03-01 DOI: 10.2478/mmce-2018-0001

Charles Chinwuba Ike

{"title":"Fourier Sine Transform Method for Solving the Cerrutti Problem of the Elastic Half Plane in Plane Strain","authors":"Charles Chinwuba Ike","doi":"10.2478/mmce-2018-0001","DOIUrl":"https://doi.org/10.2478/mmce-2018-0001","url":null,"abstract":"Abstract The Fourier sine transform method was implemented in this study to obtain general solutions for stress and displacement fields in homogeneous, isotropic, linear elastic soil of semi-infinite extent subject to a point load applied tangentially at a point considered the origin of the half plane. The study adopted a stress based formulation of the elasticity problem. Fourier transformation of the biharmonic stress compatibility equation was done to obtain bounded stress functions for the elastic half plane problem. Stresses and boundary conditions expressed in terms of the Boussinesq-Papkovich potential functions were transformed using Fourier sine transforms. Boundary conditions were used to obtain the unknown constants of the stress functions for the Cerrutti problem considered; and the complete determination of the stress fields in the Fourier transform space. Inversion of the Fourier sine transforms for the stresses yielded the general expressions for the stresses in the physical domain space variables. The strain fields were obtained from the kinematic relations. The displacement fields were obtained by integration of the strain-displacement relations. The solutions obtained were identical with solutions in literature obtained using Cerrutti stress functions.","PeriodicalId":233081,"journal":{"name":"Mathematical Modelling in Civil Engineering","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122939645","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: 5