International Journal of Civil Engineering

en PETROV GALERKIN FINITE ELEMENT ANALYSIS OF SHALLOW WATER EQUATIONS KAYVAN ASGHARI Research Paper Research Paper The solution of shallow-water equation for a two-dimensional .simulation of overland /low for an actual watershed, is presented. The Petorv-Galerkin weighted residual method is used to overcome spurious oscillations inflow depth. For modeling overland flow over complex topography and variable surface, ct pre and postprocessor was developed to utilize the Triangulated Irregular Network (TIN) model and to generate finite element mesh. Close agreement of the model with measured data is obtained. This model can be used to better analyze the influence of varying surface roughness and topography on overland flow characteristics, including distribution of flow depth and velocity (is well as resulting hydrographs. Detailed spatial and temporal output parameters provide a basis fur further study of the patterns of soil erosion and evaluation of runoff natural slopes. shallow wetter equations, discontinuous flow. Petrov,Galerkin finite element. actual watershed 114 122 http://ijce.iust.ac.ir/browse.php?a_code=A-10-3-263&slc_lang=en&sid=1 ASGHARI K. 180031947532846002060 180031947532846002060 Yes

en LINEAR AND QUADRATIC LEAST SQUARES FINITE ELEMENT METHOD FOR INCOMPRESSIBLE FLUID FLOW Research Paper Research Paper A least squares finite element method for the .solution of steady incompressible Navier Stokes equations is presented. The Navier-.Stocks equation is first recast into a system of first order partial differential equations with the velocitv. pressure and the vorticity as the main variables. Finite element discretization of the domain introduces a residual in the governing equation which is subsequently minimized in a least squares sense. The method so developed clearly. falls into the minimization category card hence circumventing the L.B.B. condition. Furthermore. the method produces symmetric positive definite matrices which makes the way for using more efficient iterative sobers. A Conjugate Gradient algorithm is, therefore, used for the solution of the resulting .system of linear algebraic equations. To improve the efficiency , of this iterative solver an incomplete Cholesky factorization of the stiffness matrix is used as ct pre-conditioner. Since the storage requirement of the Cholesky factor depends on the bandwidth of matrix. an effective algorithm for the reduction of this bandwidth has also been employed. The application of the method to solve cavity problem and .step flow with different Remolds number is presented to show the applicability of the method to solve practical flows of incompressible fluid The use of both linear and quadratic elements with selective reduced integration is also investigated and the results are presented. 92 99 http://ijce.iust.ac.ir/browse.php?a_code=A-10-3-263&slc_lang=en&sid=1 AFSHAR M.H. 180031947532846002059 180031947532846002059 Yes

en STUDY ON LOCAL VOLUME CHANGE INDUCED BY MOISTURE FLOW IN UNSATURATED SAND-BENTONITE Research Paper Research Paper This study was designed to investigate the local volume changes induced by swelling pressure in unsaturated stand-bentonite bused buffer material. A laboratory mixture of sodium bentonite (lilt/ well graded silica stool in equal proportion by do weight was used for moisture floss experiments in both ambient and elevated temperatures. Experimental results have shown that tit high water content locations within the tested specimens, the density was reduced by .3.57% from its initial values clue to swelling. The swelling pressure was calculated by 4 different models as a function of distance. The calculated results have indicated that the density distribution within the .specimen is affected by swelling potential distribution. The calculated swelling pressure values van as u function of water content, reaching I MPa at the source of water intake, i.e., at high water content :.one, and 2 MPa cot the heater .side, i.e., cot low water content .one. Barrier, Radioactive, Diffusivity, Conductivity and Buffer 114 122 http://ijce.iust.ac.ir/browse.php?a_code=A-10-3-263&slc_lang=en&sid=1 SHOOSHPASHA I. 180031947532846002063 180031947532846002063 Yes

en PROPOSED MODEL FOR DETERIORATION PREDICTION OF PAVEMENT CONDITION FOR TEHRAN ROADWAY NETWORKS Research Paper Research Paper This Paper is the result of a research project on a pavement management system that was performed by the Transportation Division of Iran University of Science and Technology. Information used in the project was gathered from 20 zones of the Tehran Municipality. Any maintenance and repair system for roads has a number of general and coordinated activities in conjunction with programming, designing, construction, Maintenance, Evaluation, and research on road pavement. Prediction of pavement condition is one of the most important parts of, such system. Prediction models have their application at the network level as well as project level activities. At the network level it is used in predicting the condition for budget programming. While in project level it is used in economical analysis. Many factors have been used in determination of pavement condition. These factors are the design life of the pavement, loading, climatic condition, and the type of road. To be able to plan for future improvements we need to predict the future condition of the pavement. In this paper, factors affecting the prediction of pavement condition are discussed. A model is developed exclusively for Tehran based on the distress data collected. 1 1 http://ijce.iust.ac.ir/browse.php?a_code=A-10-3-263&slc_lang=en&sid=1 BEHBAHANI H. 180031947532846002064 180031947532846002064 Yes MOHAMMAD ELAHI S. 180031947532846002065 180031947532846002065 No

en AMBIENT VIBRATION TESTS OF A MODERUN ARCH DAM SOME PROPOSALS FOR METHOD OF DATA PROCESSING Research Paper Research Paper Ambient vibration test is an effective and economical method for identification of dynamic properties of structures such as dams. Mathematical models generally are developed for the design purpose. Structural and material parameter are assumed from similar projects or limited material tests. Therefore it is usually desirable to verify the results obtained from mathematical model by performing vibration test on the actual as-built structure and process its, data correctly. There are addressed in this paper. A modification of mathematical model could then be performed. 7 15 http://ijce.iust.ac.ir/browse.php?a_code=A-10-3-263&slc_lang=en&sid=1 MIVEHCHI MAHMOOD R. 180031947532846002066 180031947532846002066 No M.T. Ahmadi 180031947532846002067 180031947532846002067 Yes HAJMOMENI A. 180031947532846002068 180031947532846002068 No