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International Review of Civil Engineering - July 2010 - Papers

 

 
   

 

 

 

International Review of Civil Engineering - Papers

 

go to top   Response of Resilient-End Supported Beam on Elastic Sub-Grade to a Moving Point Load

         by Shahin Nayyeri Amiri, Asad Esmaeily

       Vol. 1. n. 3, pp. 193-200

   

Abstract - In this study, the response of a resilient- end supported beam on an elastic sub-grade to a moving concentrated load is obtained using the method of the harmonic series analysis. Numerical examples are given in order to determine the effects of various parameters on the dynamic response of the beam. From the solutions obtained, within the ranges of parameters considered, it was seen that for the case of simply-supported beams the series solutions converge very rapidly, and an increase in the elastic foundation parameter results in the decrease in beam deflections with the maximum dynamic deflections occurring under the load. Furthermore, for the very low speeds of the load the deflection profile becomes symmetric with respect to the load.

Copyright © 2010 Praise Worthy Prize S.r.l. - All rights reserved

 

Keywords: Resilient-end supported beam, Elastic sub-grade, Moving point load, Dynamic response.

 


 

go to top   Effect of Corrosion on Remaining Life and Failure’s Mode of Steel I-Beam Sections
         by R. Rahgozar, M. Malekinejad

       Vol. 1. n. 3, pp. 201-211

       

Abstract - Corrosion of steel structures is a serious problem throughout the world. Clearly either general or localized corrosion reduce the strength of steel structures. The objective of this paper is to investigate the effects of corrosion on the remaining life and failure's mode of steel I-beam sections. Thickness loss data were compiled from three samples of corroded damaged I-beams, removed from a petrochemical industry. Corrosion damaged models have been developed for steel I-beams based on thickness loss data. These models are used to deal with the effects of corrosion on the strength of steel I-beams. The results indicate that as a beam is corroded the mode of failure may change. The lateral torsional buckling is the critical failure mode at the early stage of corrosion and after several years of corrosion the local buckling of flanges becomes the critical failure mode.

Copyright © 2010 Praise Worthy Prize S.r.l. - All rights reserved

 

Keywords: Corrosion, Failure modes, I-beam section, Remaining strength, Steel structures.

 


 

go to top   Performance of Concrete-Filled Steel Columns Under Eccentric Loading
         by Elsayed Mashaly, Mohamed Diwan, Mohamed El-heweity, Erini Shenouda

       Vol. 1. n. 3, pp. 212-224

       

Abstract - This paper presents a 3D finite element model for the nonlinear inelastic analysis of concrete-filled tubular (CFT) columns under eccentric loading. Material constitutive relationships for concrete core confined by steel tube are incorporated in the model to account for the confinement effects that increase both the strength and ductility of concrete. The predicted ultimate capacities and complete load-displacement responses of CFT columns under eccentric loading are compared with both the experimental results available in the literature and the design code provisions to examine the accuracy of the finite element model utilized. The fundamental behavior of eccentric CFT columns with various width-to-thickness ratios, length-to-width, and values and locations of eccentricities is studied using the verified finite element model. Based on the extensive numerical studies, interaction curves of ultimate capacities between the axial force and the uni-axial moment are presented. The interaction curves developed are shown to be an effective and easily design tool for the nonlinear inelastic behavior of CFT columns under eccentric loading.

Copyright © 2010 Praise Worthy Prize S.r.l. - All rights reserved

 

Keywords: Concrete-filled Steel Columns, Concrete, Eccentric Loading, Finite Element Method, Steel.

 


 

go to top   A Method for Concrete Building Components’ Hygrothermal Analysis - The Computational Tool ΥΜΘΥΣ
         by Christina Giarma

       Vol. 1. n. 3, pp. 225-237

      

Abstract - In this paper a method for the calculation of simultaneous heat and vapor transfer inside single-layered concrete building components is presented. Specifically, the physical background of this method is outlined and its mathematical core is presented. Furthermore, the computational tool ΥΜΘΥΣ, which is the software implementation of the proposed method, is analytically presented (input/ output data). Finally, the accuracy of the proposed method’s results is verified through their comparison with the results of a widely accepted hygrothermal analysis tool.

Copyright © 2010 Praise Worthy Prize S.r.l. - All rights reserved

 

Keywords: Heat transfer, Moisture transfer, Concrete components, Hygrothermal calculations.

 


 

go to top   An Extension of the Southwell Method to Columns in a Frame Structure
         by Shahin Nayyeri Amiri, Hayder A. Rasheed

       Vol. 1. n. 3, pp. 238-242

       

Abstract - This paper shows an approach whereby the critical loads of columns in a multi-story frame can be determined by using lateral deflections obtained through matrix formulation. The deflection data of columns in a multi-story frame are obtained by including the effect of presence of axial loads in the member and structure stiffness matrices. Effects of initial bending moments are also included. The results prove that Southwell plotting technique used to determine the critical load of single column is also applicable to framed columns.

Copyright © 2010 Praise Worthy Prize S.r.l. - All rights reserved

 

Keywords: Southwell method, Framed column, Matrix formulation, Critical load.

 


 

go to top   Peak Ground Acceleration Prediction Using Artificial Neural Networks Approach: Application to the Kik-Net Data
         by B. Derras

       Vol. 1. n. 3, pp. 243-252

        

Abstract -  The aim of this work is to propose a prediction equation of the PGA using the Multi-Layer Perceptron Artificial Neural Network method (ANN) with a Levenberg–Marquardt backpropagation algorithm for the training. The inputs are the magnitude, the focal depth, the epicentral distance, the thickness and the mean frequency at up to a shear wave velocity equal to 800m/s, while the target result is the PGA. To establish this network, data collected from the KIK-NET seismic data base in Japan area have been used. 102 sites and 1850 records are used in the training phase while 326 events were not used in the training are kept for the test phase. The obtained results show that PGA computed using the ANN method are close to those recorded. Finally, a example is presented, in which, 55 records are used to compared the ANN method with two Ground Motion Prediction Equations (GMPEs). This example demonstrates how the ANN is more robust than classical models.

Copyright © 2010 Praise Worthy Prize S.r.l. - All rights reserved

 

Keywords: Artificial neural networks, KIK-NET recorder network, peak ground acceleration, seismic parameters, site parameters.

 


 

go to top   The Analysis of Flow Conditions at Odra River Mouth
         by Z. Meyer

       Vol. 1. n. 3, pp. 253-259

       

Abstract -  The analysis of flow conditions at the Odra River outlet is presented. The flow at the river outlet is controlled by the discharge coming from the upstream and by the sea water level. Along the outlet distance (from Gozdowice to Trzebież) very small free water surface slope occurs: 10-5 and on the distance Gryfino – Trzebież:10-6. The very small slope causes small free water surface elevation differences difficult to be measured. The sea level changes produces backwater curve upstream the river. So the resulting slope and depth must include both factors: flow and sea level. The backwater curve extends horizontally up to Gozdowice river cross section i.e. about 140 km upstream. An essential factor is to predict water level at that distance depending on the river flow and the sea level. A proposal of mathematical description of the backwater curve on the considered distance is given.

Copyright © 2010 Praise Worthy Prize S.r.l. - All rights reserved

 

Keywords: River mouth hydraulics.

 

 


 
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