نشریه شریف
پیاپی 42 (خرداد و تیر 1387)

In this article Tir connection repair of damaged sidebar Rftvbrgshty loads) such as an earthquake (using polymeric fibers experimental and numerical study is located. Rftvbrgshty loads to the end of the Persian month Tir full-scale laboratory model has been applied. Loading until the sample its capacity, has continued, and then samples using polymeric fibers restored and re Trmymshdh example is located under the loading Dvrhyy. For numerical studies, laboratory sample finite element method is made. Numerical models considering the values registered by the nstrument Tbyhshdh measured on a laboratory model, has been modified. for the effect of fiber arrangement polymeric nonlinear models with five different layout under the loading fibers were similar to laboratory and placed has been studied. Test results showed that the resistance and energy absorption example damaged application of polymeric fibers has been modified, although changes in hardness of specimens is remarkable Trmymshdh. omparison between the numerical examples of the capacity and layout arrangement of various polymeric fibers are restored provided Is.

Methods for assessing the liquefaction potential of soils Mas·hyy generally is determined based on the analysis. nalysis of precision in certain parameters, without dispersion and error are considered. Moreover, the use of these procedures between the occurrence of liquefaction and confidence there is no exact relationship. This answer can be given by reliability analysis. In this article, based on reliability analysis technique known as "liquefaction otential assessment" reference {1} and using the results of standard penetration test is expressed. Because this technique requires values Kmykrdn is uncertainty in the calculations, one can use statistical moments related to uncertain parameters such as mean, variance and probability density function values most likely in connection with their uncertainties calculated. Then, using advanced first order second moment methods) AFOSM (, one can alculate the reliability index and its relationship with the occurrence of liquefaction and confidence gained. For complete results data analysis using statistical regression based on Results 180 to a record 26 boreholes in ifferent parts of the region Babolsar, Rabthyy between normalized standard penetration number, the ratio of shear stress and chance Dvrhyy soil liquefaction has been suggested. Record Babolsar region, Lrz·hyy Profile Rabthyy between resistance and occurrence of soil liquefaction is proposed. Done well performance comparisons show the proposed relationshi.

Discontinuties accurate classification in rock masses in the analysis and design of rock structures on the surface plays a role. Discontinuties traditional classification based on surface density determines the distribution pole is Astryvnt discontinuties screen. Use different methods to determine the surface density, will lead to different results. In order to document categorization discontinuties combine AI techniques with probabilistic methods are used. Advantages of this method to determine the exact number of categories of discontinuity and discontinuities determined to belong to any particular category and that it is independent of the distribution of data.

Phenomenon under certain conditions the complex currents in Hungarian there comes close, during which the "free surface flows" and "flow pressure" occur simultaneously. Systems that are experiencing this phenomenon, depending on the location to create complex flows, how to transition current and S·hnqth may be different problems, so in order to design and analyze complex flows properly control the various components of such systems is essential. For the analysis of complex flows, based on formation and how to pursue common positions between the two levels of flow and flow behavior Sadhknndhy assumptions, different methods have been suggested. The study in Hungarian streams of complex packages using virtual slot via a numerical model analysis is appropriate. Proposed model using the results of a physical model evaluation, and results are presented.

In this study, the energy input to the structure of the near fault earthquakes have been studied. Earthquake near record field properties that distinguish them from other earthquakes makes. Including Pulses with this profile can be noted that the long period on record fields are mounted with high frequency content. Nature of this ulse to record the nature of the field has more certainty and point of structural response in two stages and definite possibilities, and then combine them together may Makes. This attitude makes it almost certain that part of the answer is entered in processes, not probabilistic, and thus increase the accuracy of answers. Listed according to the structural response approach to calculate the near field of earthquakes, and the results form the internal ructure of energy spectrum is presented. Results suggest that it is provided near an earthquake fault with a large increase in internal strain energy structure and its corresponding period, and increases the range of results is more a function of the pulse profile record less affected areas. On the other hand, whatever the distance of the fault is large relative share of the record field increases; Bhgvnhyy in the range of responses seen in two areas of local maximum. Maximum range of areas including an area close to the response period and the area most of the record field pulse period is longer in place.

Today, as a stimulus cycles Mykrvpmphay Ghyrmkanyky Mykrvsyaly in many industries such as electronics and medical applications and having Bhlhaz convenience feature is the increasing attention. In this review Mykrvpmphay change as a new type of fuzzy Mykrvpmphay Ghyrmkanyky is studied. In this context, initially using dimensional analysis, numbers Bybd affecting Dubai Mykrvpmp volumetric phase changes and more are determined to identify how the pump works, and independent of Ykbdy model for predicting flow transition in terms of governing dimensionless numbers are presented. Results from these models match the experimental results shows good. Finally, using the obtained equation the effect of different parameters on the performance work station is described. This can result in subsequent studies in order to optimize the performance of pump used.

In this study, the deleterious effects of ultraviolet solar radiation as a damaging environmental factors on the mechanical properties of composite glass / Plyastr was investigated. For this purpose samples of the resin material strength tests Plyastr prepared under accelerated UV tests were. To obtain the curve changes when the arameters and mechanical strength of the resin under the influence of ultraviolet irradiation, samples were taken at three different time period) equal to three months, six months and one year equivalent to the Florida area (under ultraviolet irradiation were studied. The test conditions environmental parameters in order to assess changes in mechanical tests on specimens mechanical properties and radiation was not irradiated. mechanical properties tests results indicate noticeable drop in modulus and transverse shear stiffness properties of glass and Plyastr Tklayh and Composite [0 / 90] $ _ {s} $ found. This study also shows how the UV absorber in order to raise Adding Firefox composite resistance against UV degradation effect is effective.

In order to study the behavior of wind turbine blades and aerodynamic cross section, for the first time in the country and sponsored by the New Brnamhyy comprehensive energy sector, including various tests, is provided. There are currents due to three dimensions and its importance in the behavior of aerodynamic blades, a cross dimensional turbine blades under construction in the subsonic wind tunnel of Agriculture, Shiraz, in the angles of attack $ $ -5 to 25 degrees and speeds of 30, 60 and 80 meters per second tested. The results of sequence models, including static pressure distribution, drag coefficient and the coefficient for, with the results of experiments comparing two-dimensional and dimensional effects in the flow coefficients Has been investigated. These reviews indicate that there dimensional flow coefficient decreases for the blades and turbine blades is performance. However, in a state of exhaustion dimensional angle increases.

This article answers a Layhchyny fatigue and foam core sandwich plates with asymmetric hybrid was investigated. Layhchyny sandwich desired part of the critical elements of a real composite structures. Preparation and construction methods and materials similar Layhchynyha critical element. Two similar type of woven glass fibers) 2, G 1G (a type of carbon fiber Tkjhth) C (epoxy resin systems at the top and bottom plates to the foam core has been used. Thus, each layer of Chinese and angles Layer consists of:] 1/C/C/G2/Foam/G2/C/C/C/G1 [G and] 0/0/0/45/Core / $ pm $ 45 / $ pm $ 0/0/0/0 [. In order to determine the practical testing plan, creating the ultimate defeat of the area and measures to achieve the real strength of two different designs with the help of FEM methods were investigated and appropriate designs for static and fatigue tests were the final choice. Finite element analysis results using the static tests was confirmed. Next, several fatigue tests were performed on the samples and finally Layhchyny injury in situations Layhchyny sandwich under static and fatigue load Was described. Results show that the use of project area embowed cause transmission failure of measures to clamp the connection within the device range is Drvnytr measures and hence the resulting strength is closer to the true values. Fatigue tests of high loads in the ratio leads to similar results. Four of the injuries diagnosed condition, growth, and two parallel vertical cracks along the loading occurs within the foam. Increased with time, leaving long stretches loading parallel vertical cracks that are created for decreases.

In this study the instability boundary in the wing regime Trakmnapzyr flow using aerodynamic Peters extracted, and the results were compared with the aerodynamic Tyvdvrsvn. Bdynmnzvr for first in the frequency domain coefficients for pure oscillatory reciprocating motion, and aerodynamic model based on Peters, was obtained. Relationship obtained by charting the coefficient for real and imaginary parts, in terms of frequency Kasthshdh, with values obtained were compared Tyvdvrsvn hypothesis. The resulting graphs represent the results of approaching the Peters method Tyvdvrsvn method, by increasing the number of state variables is aerodynamic, so that the aerodynamic state variables with five acceptable agreement between the results seen. Next, the relationship to the mass matrices, aerodynamic damping and stiffness model was Peters. To extract the matrix of the two common methods and is equivalent to cross Mercury's wings were used for structural modeling. Finally according to the dynamic equations obtained from both modeling, stability and speed Flatr for two numerical examples using $ k $ and $ pk $ were studied. Compare the results with values obtained from Tydvrsvn ypothesis suggests close is remarkable between the two hypotheses.

In this paper, using finite volume approach and layout Hmmkan the basic equations governing fluid flow effectively paid a distribution of velocity and pressure step method detailed in a network with simple structure has been calculated. The physical properties of the fluid effective transport solution than the volume obtained diphasic omes. And more rigid body motion equations, are calculated Jabhjayyhay float. Using a network solution connects to the object, obtained in Jabhjayyhay Each step when computing on the network and thus acts as floating movements over time are recorded. Suitable projects Gssthsazy, especially considering the pressure on the integral high density difference of climate is very important. In order to study a new approximation method Myanyaby pressure on the cell surface is presented. This algorithm is based on a software prepared and treated water to the point Dayrhyy considering rate changes due to collision is simulated. Next, the hydrodynamic resistance while advancing barge floating in calm water bound in two cases, and two degrees of freedom motion has been predicted. Evaluation results indicate the accuracy and validity of the algorithm provided, and take advantage of the total movement of vessels, especially in the early stages of nonlinear design.

To obtain a stream of locusts on the various components of a flying boat, given the current complexity and nature of its three dimensions using numerical methods, Navyr dimensional Stokes equations and solved on the tail of locusts has been studied. The results show that the various components of the tail propeller flying boat flying near the urface is quite important to establish how the tail propeller to be moments so that can be obtained from the zyalamkan neutralize the effects of locust and yet forces And for placing the post in the appropriate range. Examining the results, the angle and direction for propeller installation specified. In this article the use of computational fluid dynamics, solving the flow around the propeller and tail flying boat near the surface with about 3.1 million cells by use of parallel Supercomputer Processor Number 6 is obtained and the interaction between these two components are reviewed and presented.

Pyshkhvr neural networks as a suitable tool in many fields of civil engineering have been used. These networks, particularly in many geotechnical engineering problems have been successfully used. Review of articles published in this area indicate a successful application in areas such as capacity forecasting candles, modeling the behavior of soils, liquefaction, and is S·hnqth. However, any information about training algorithms affect the amount of each input parameters on output variables do not provide the user. In other words the importance of understanding the degree of fast inputs using weights and functions can not be stimulated. In fact, artificial neural networks to the user as a Jbhsyah that can only be introduced with very sophisticated processing on the data to produce a specific output. To solve this problem during the last 10 years a number of interpretive methods in order to analyze the amount of influence and importance of input variables on output network is proposed. In this study, six commonly used methods Tfsyryand way are compared with each other. Data used to train neural networks to determine which is based Mjmvhazmayshaty clays mixed dynamic parameters were performed. Finally, the method shows the best performance interpretation has been introduced.

Axial symmetry in the current study, slimy and supersonic equilibrium gas effects on the nose Srpkh objects using shock fitting methods and numerical simulation of shock capturing and shock effect on the accuracy of boundary condition for solving the field results has been studied. Numerical solution of Stokes equations Navyr Layhnazk (TLNS) and implicit finite difference algorithm Ghyrtkrary fear - Varmyng done, and reformulation to apply the appropriate boundary condition for shock shock fitting method with equilibrium gas effects are presented. zhermodynamic properties and transition properties of air in chemical equilibrium conditions using Srynyvsn et Brazshshdhy curves are obtained. Numerical simulation of supersonic flow with regard to effects on the equilibrium gas at a Mach number Hemisphere $ 16.89 USD Performed, and results of field profile and current position of shock with available numerical results are compared. The present model calculations for both gas and ideal gas balance carefully done and the results flow profile and the shock for both shock capturing and shock fitting has been evaluated. The role of numerical damping terms and precision impact on the computational aspects of network Results of the field has been solved.