نشریه شریف
پیاپی 48 (خرداد و تیر 1388)

Discrete element method in modeling the displacement in 1971 masses of stone, And modeling issues in the decade 90 in Soil Mechanics and Foundation were used. In The study of this approach to model soil walls by the armed Metal strips are used. Bdynmnzvr, collection of soil and reinforcement Zvznqhyy framing members are divided into a number that includes a member Tape is reinforced. The funds that the soil is in contact with soil, Members connect using two springs and vertical shear occurs. This behavior Elastic springs paste form and their properties according to the parameters Soil is determined. Face contact with members of the rupture surface, the four springs Is shown. In order to add two springs acts of stretching and cutting force Mslhknndhha Have been predicted. Tension springs hardly the behavior Mslhknndhha Soil friction pads, shear spring stiffness using the theory of the Persian month Tir During the elastic substrate resistance is calculated Mslhknndhha. Using Funds from the computations of forces in each member matrix, stiffness matrix Members Determine their composition and matrix hardness of the whole structure can be produced. Applying Set of forces, and change the system matrix has been analyzed during the spring The relative shift of adjacent sides is determined. Calculation Productive forces of the springs barely changed in length is achieved. In order to control Modeling results and provide capabilities and performance of a computer, program Fortran Bhzban written numerous examples have been analyzed. Static and dynamic analysis of soil structures that armed In traditional analysis techniques with many flaws and deficiencies Hmrahand easily And sure enough different loading conditions were studied.

In the present article to identify behavioral characteristics of sand Anzali, Under seismic liquefaction potential evaluation, According to previous studies and information Gmanhhay Hfrshdh, review and evaluation of deposits were shallow area. Then, Behavior of sand for the area under the same vibrational forces earthquake Device made of transparent plastic Including sand mass exposure chamber, and tables seismic system Applying water drainage was created. The device features vibration of soil mass With different vibration frequencies and slopes, water pressure measured Hfrhyy Pyzvmtrhay Tbyhshdh tank wall by a clear, force Drainage water to the drainage dlkrdn desired soil profiles, and the phenomenon of Boiling sand liquefaction as one of the complications is high. After Complete system calibration, tests to check the behavior of sand Bandar Anzali with different densities in static mode via Zyrfshar Mas·hyy and boiling, and in dynamic mode under vibration with different Shtabhay G0.15 equivalent to g0.3 and Densities were varied. Results via From these experiments, different conditions for the occurrence of liquefaction and instability Qualitative and quantitative aspects were studied.

The most important design parameters of the columns in buckling coefficient is the effective length. For Columns with variable cross section, in the past due to the absence of the exact solution Deformation of the differential equation, the coefficient of effective length of the form {} and using the approximate Ayranyk Was determined from numerical methods. In recent years, with the introduction of software Mathematical ability, the deformation of the differential equation can be solved, and the coefficient Basis over their effective {} Ayranyk exact error rate found in previous methods Checked for. Insert the document with the "Foreign Work Done The structure "with" structural bending elastic energy "caused by buckling, the critical load Factor structure and hence the effective length of the columns are obtained. Structure Considered a symmetrical frame Ykdhanhy steep section variable) Salon (which is For the free state side against the motion and the joint Tkyhgahhay Is investigated. Obtained after the analysis and graphs coming {Ayranyk exact Trahykh} They use {} of Ayranyk much simpler regulations charts is AISC results Obtained with the work of others) approximation methods (it was compared.

This essay question based hydraulic cracks within a borehole, Planar strain state in the environment and the homogeneous elastic impermeable review Placed. Compactibility fluid and proximity effects in order to speculation Explain the initial instability in the development phase during which left the laboratory experiments Ryztrk Situ is done to determine the stresses, are considered. Way Solution offered in this study with regard to the net fluid pressure, length And the opening is seen leaving the only issue depends on the viscosity Bybd and other parameters including the size of compactibility and speculation Is. Next, solving for the fluid to the pressure Ghyrgranrv Leaving is uniform, leading to instability in the problem identified after defeat Be. Unstable growth potential depends on the ratio of left to leave early Borehole radius, compactibility fluid, fluid volume, and modulus of elasticity is material.

Using colorful materials such Flvyvrsyn color lines that can produce water, a method of gaining speed is fluid. In this study the long-vitro effect of roughness on a fast change in a dual fluid, the fluid velocity in the upstream roughness using the line color is achieved. The speed obtained from this method with a generalized numerical model is compared. The numerical model of the numerical solution of equations governing fluid motion for admission in the rugged and coordinate system Mnhnyalkht has been made. Distributed quickly and Dubai layers using color lines are calculated with the numerical results are compared. These results compare features suggests this approach is to estimate the fluid velocity.

The most important tool for project manager to make decisions about how to control and navigation project, Information obtained from reports by the Department of Planning and Project Preparation Be.Project reports due to lack of conventional feature updates and analysis Minute prediction information and project barriers simultaneously in all dimensions, Can not provide a clear picture of the project. Also due to lack of sustainable basis How to measure the activity at any moment of time, planning and scheduling this Some of the obstacles Bhlhaz activities of the project makes Other activities that have fallen behind schedule will be waived. According to the authors research, the most successful project control system is now standard born Value is achieved. Project manager can use indicators derived from the establishment This emerging system problems And barriers to implementation in the shortest time possible with the identification and understanding Correct the situation and predict future problems to provide effective solutions to provide Project goals set pay.