نشریه شریف
پیاپی 46 (بهمن - اسفند 1387)

Considering that Iran is located in the regional Lrz·hkhyz, damages Johnny recent large earthquakes and financial importance in the context of more Reviews Evaluate existing design methods has increased. To promote research Related to earthquake preparation Shtabngashthayy response spectrum matches thespectrum Design or range specified risk level is essential. The aim of this paper presented a method for the preparation of such Shtabngashthayy of real accelerograms. This method is based on the divided domains Periodic intervals to determine response spectra and by the scale factor for each The domain. In continuation of the seven bogus software Shtabngasht SIMQKEI Real Shtabngasht Mqyasshdh seven proposed method, response spectrum Matches the range of standard designs, Third Edition 2800, for the third and soil type Are producing too much risk. Accelerograms for the evaluation set Derived, nonlinear behavior of concrete structures Lrz·hyy studied Is. Mobin reviews that the proposed method can be no significant increase Energy input to produce Shtabngashthayy with specific characteristics that In order to analyze and design structures can Be used.

This article examines the effects of soil liquefaction effects on tunnels and changing circumstances Pvshshdar Environmental deals. This study has tried to model Suitable for liquefaction behavior, forces of change and cover tunnel Balaamdgy Induced liquefaction is examined. For this purpose the FLAC software This type of modeling has the capability, is used. This article includes Two essential part is the first part introduces a reference model and the effects of liquefaction The soil model has been discussed. In the second part of the changing conditions Environment in the model, the forces created in the tunnel cover assessment Placed. The effect of various parameters on the change of forces Forms change and cover tunnel is being evaluated.

Among the systems effectively resisting side loads can shear walls with steel core, noted that the major advantage of their capabilities due to ductile buckling in sheet steel. To use this feature there are two general solutions: Use Skhtknndhhay metal, and another advantage of the concrete cover from Brshgyrha to connect and form sheet steel shear walls composite) Composite (ping. In this study, the effect of various factors including the Persian month Tir Middle Slbyt effect Tir connection type column, the effect of varying distance Brshgyrha and changes in the thickness of concrete shear walls with steel core), in a state with no Skhtknndh Skhtknndh (comprehensive assessment of the behavior of the system against lateral loads is presented. Bdynmnzvr different models of these walls using the finite element modeling and analysis methods are. Analytical Model validation results with a model sample tested, shows that the behavior of steel shear walls Tqvytshdh Slbyt independent beams connecting the middle and Tir type column, but the shear walls No Skhtknndh steel, causing increased middle beams Slbyt better stress distribution uniformity in the steel plate is. the shear strength of shear walls composite with a thickness of concrete cover direct comparison, and is inversely proportional to the distance between Brshgyrha. Bdynmnzvr graphs with the presentation of results, the lowest proper thickness of concrete cover and the distance between Brshgyrha suggested.

In this article the effect of reducing the behavior of hysteresis cycles in nonlinear staticanalysis for flexural concrete ductile frames are investigating. One of the disadvantages of nonlinear static analysis is that non-linear behavior change resulting from structural components due to Kahndgy reciprocating motion is generally the approximate order. To assess the effects of 9 Kahndgy special concrete frame is used based on the design of buildings against earthquake regulations) Standard 2800, Third Edition (loaded and ETABS software are designed to analyze. Due to the special concrete in bending Frames Members of behavior are controlled mainly by the bending of the coils and Takda modified hysteresis model is used. Static and dynamic non-linear analysis software using IDARC is done to assess the damage and stigma of the model takes advantage of the famous park. Maximum shift values obtained from nonlinear dynamic analysis with the corresponding shift values obtained from objective analysis Barafzvn are compared, and results indicate that the average maximum values shift with regard to both behavior components reducing the risk level g0.2 and dealing respectively g0.25 4 % 9 % shift towards goal Barafzvn analysis increases. The modified model also Takda Kahndgy takes into effect, the index level of risk damage Bhazay g0.2 dealing with 53 % compared to the model Dvkhty increased risk levels equal to the ratio g0.25 81 %, respectively.

Numerical modeling of very soft soil layers consolidate under the weight of that material in the consolidation nalysis And consolidation of dredged material discharged in the tailings dams is used, over several decades Recent special attention has been. In this paper, taking into account the effects of large strain and permeability changes and compactibility Loose soil layers during consolidation, applying finite difference method to solve, and use a New method for interval Mjzasazy place during periods of filling, a Computer, formodeling the different conditions is produced by the weight consolidation process. Then through Comparison of model results with field values and the results were Shtsnjy computer, programs, Performance analysis of real problems in the model has beenvaluated. Numerical modeling of very soft soil layers consolidate under the weight of that material in the solidation analysis And consolidation of dredged material discharged in the tailings dams is used, over several decades Recent special attention has been. In this paper, taking into account the effects of large strain and permeability changes and compactibility Loose soil layers during consolidation, applying finite difference method to solve, and use a New method for interval Mjzasazy place during periods of filling, a Computer, for modeling the different conditions is produced by the weight consolidation process. Then through Comparison of model results with field values and the results were Shtsnjy computer, programs, Performance analysis of real problems in the model has been valuated.

Traffic assignment literature, assuming Namhdvdbvdn possible arcs network capacity, in ways such as how Frank - Wolfe capabilities have solved this problem efficient. Because these methods Khtyshdh Zyrmsylhy equivalent shortest path between origin by destination. But in fact possible arcs network capacity is limited and to achieve realistic results from the volume of traffic flow arc, considering the limited capacity of parentheses is required. Explicitly consider the issue of allocation of these restrictions caused traffic into Zyrmsylhy Khtyshdh Chndkalayy current issue is the minimum cost solution makes it difficult. Alternatively considering capacity constraints implied parentheses form, function and use of fines is sensitive to network capacity Bhnhvy possible arcs that adding thisfunction to observe the functions of travel time due parentheses parentheses capacity is limited. In this article the appropriate penalty function for this purpose proposed, and its efficiency in solving traffic assignment with capacity constraints by solving some examples are studied. The results of this method with other methods considering capacity constraints, such as using the internal penalty function method) IPF (Lagrange coefficients and incremental) ALM (, Word has been compared. The result also use this method to a real network of Mashhad, as a real example, where the lights tips leading to the possible arcs with capacity constraints are considered, is presented.

Tanks containing liquids behave under earthquake, according to their importance There also due to interaction between fluid and Saz·hyy system, attention And study of many engineers and researchers have been. The method of "time Durable Footnote {endurance Time}», structures affected by accelerated intensity function Is being increasingly based on time and function that can force And to tolerate incoming Tghyyrmkanhay is assessed. The aim of this project Examine how the effect of earthquakes on steel tanks in accordance with the regulations Rvzmyny Design of the tanks), such as API and AWWA (and last time using the Rvzmyny tanks and reservoirs in the study of the behavior of this method is the standard range. Also, the results of last time with other methods methods Yynnamhyy The comparison, and rate design in order to adapt this method Lrz·hyy anks Rvzmyny steel with other methods is Yynnamhyy review. The study After review of the relevant egulations and mechanical models used The Codes, using the finite element method, dynamic response Mharshdh flexible tanks under earthquake input record is read. For this purpose the whole environmental and structural omponents with degrees of freedom given by Fluid Shift model and interaction between structural and fluid equations given by Adverb was provided. Modeling in the form of axial symmetry, harmonic And three dimensions, the profile of one of the tanks were used Astvanhyy Compactibility and viscosity effects) viscosity (the fluid within the reservoir in Was.

Transmission Towers and important components of the main transmission lines are In Brqrsany play an important role. The power transmission tower The conductor held responsible in a certain distance from the earth, must Able to withstand the mechanical forces imposed on itself in the worst circumstances And climate are. Considering the multiplicity of members and high cost structures Each, both in terms of materials and performance, they can be highly optimized Is important. These structures, usually under the combined loadings of Been numerous and optimization process faced with numerous analysis Will. In this report the use of genetic algorithms for optimization Was. One of the problems in the use of genetic algorithms for Bhynhyaby Bhazay structures that should per string, each generation of a Program analyst to do the calculation. Such a matter requires Matrices is Mkvssazy. Was seen in the tower of Zyadshdn Members and geometry in the absence of mast Bhynhyaby also be onsidered, the convergence Method is very slow. In these conditions the combination of neural networks and algorithms Genetics has been used. Thus the task of analyzing part of the mast Bhhdhy network. Using genetic networks along the convergence speed Remained very high. Genetic algorithms also selected Chndjmyty Is. Abstract The purpose of this article generally the effect of applying the network and not using it and Compare the impact of genetics is Chndjmyty.

One of the most important issues in the field of optimizing water resources management, Various Khalgvrytmhavrvshhay been used to solve it, the issue of exploitation Is optimal reservoir. Today, the algorithms for solving these issues Frakavshy than other algorithms used. One of the most important of these algorithms, Optimization algorithm is the first community of ants on the basis of the proposed algorithm, ant system approach is. In recent years this method also for better performance and reduced its disadvantages, including Algorithm convergence phenomenon Nabhhngam issue the basic community Ants reform, and new algorithms based on it is defined. One of these algorithms in this article as it is used, Minimum System Max is Mvrchhhay algorithm. First Steps to solve the problem using this algorithm, consider the variable Decision for the issue, then according to this variable, a good graph For the issue is defined. In this paper operation to solve problems Simple and the hydroelectric dam in two modes is considered. Mode First, the decision variables considered include the amount of water released by Of the reservoir, and the second case this variable is simply the amount of water stored In the tank every month. In this article issues and simple operation of hydroelectric Dez reservoir system using algorithms Mvrchhhay Minimum and maximum For both the above is solved and finally, the results With the results of other methods employed to solve the problems of And has been compared. This comparison suggests that the method results Mvrchhhay System Minimum Maximum Is appropriate. Also, the modeling and solving their problems using Version 8 software, Lingo, indicates that using this algorithm with Computational cost almost perfect answer for the problems Was.

Structural Systems Dalhay mutual, according to the advantages of views Economic and architecture, widely nsidered the structures come. Method "Frame Equivalent to "a comprehensive and appropriate way to analyze the types Dalhay is bilateral. Due to non prismatic sections of slab beams and columns, tables Difficult to obtain and transfer coefficients, and there Lngrhay tangly That certain aspects of sections for beams and columns, and the only evidence Uniform load over a certain span is presented. Given The approximate values of these tables, and computing complexity and Tvlanybvdn, And for optimizing operations and results of the analysis in this paper using Equivalent frame method, and considering the hardships upon all changes in all Members, by using equations in the form of steep decline Thyhshdh Software Dalhay detailed analysis has been mutual. Two sample structures, Solutions manual and using the coefficients tables, software Thyhshdh And the finite element method have been analyzed. Compare the results indicates The results are Tkyhgahy Akhtlafhayy Lngrhay.

Method in time history analysis of buildings is usually the horizontal component Shtabngasht and vertical arthquake in two directions perpendicular to the main building extensions Effects are presented and responses made in the design criteria for members Factors. These responses accelerograms orthogonal horizontal angle Than the main axes of the building, they will change. In this article a building Regular steel in the plan and elevation, and onlinear dynamic method in Taking seven Shtabngasht analysis and critical angle and the ratio increased Replies Has been set. Findings of the critical angle varies with changing ShtabngashtIs. The mean angle of 22.5 degrees and the crisis in the column on the beams 90 degrees Is obtained and the responses to about 73 % increase shown. Also Increased intensity in the nonlinear behavior of earthquakes and increased Saz·hyy members reviewed Been changed and the results indicates the critical angle and increased ratio Replies accumulation of earthquake intensity is increased.