نوبخت بختیاری Articles List

List of Articles نوبخت بختیاری

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1 - Two dimensional numerical models for reservoir sedimentation of dams
nobak bakhtiyari Bager Nikofar
20.1001.1.23456310.1384.2.2.2.1

        When a dam is constructed on a river path, inevitably sedimentation of alluvial materials occurred. Therefore, the initial capacity of the reservoir reduce gradually, and if don’t predict the effects of this phenomena and More

        When a dam is constructed on a river path, inevitably sedimentation of alluvial materials occurred. Therefore, the initial capacity of the reservoir reduce gradually, and if don’t predict the effects of this phenomena and its proper control methods, the application of the reservoir may be affected. The findings of this thesis confirm that, the sedimentation in reservoirs and the variations of the bed and free surface profile of the reservoirs depend on the adoptive methods used for solving this equations and also on the kind of the experimental equations used for calculating the sediment load and its physical characteristics. Also this study shows that, using the simplified assumptions (Steady state flow) with respect to the physical characteristics of sebiments and the kind of the adoptive equations of bed load is very sensitive.  In this research, study 2-d numerical modeling of sedimentation in researvoirs (case study of shahid kazemi dam of bukan), that a mathematieal moael is presented for studying aggradation an degradation in allnvial channels with width of unit, two-dimensional, steady, gradually varied flow equations and the sediment continuity equation are solved numerically bye the second-order, accurate, explicit finite difference scheme developed by lax. For this purpose, the dam’s data in the sarogh-chi station with three sediment discharge equations (Hassan zadeh-nilsen-mear piter) are used. And finaly some results about the capability of model are obtained. Manuscript profile
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2 - Evaluation of self-compacting concrete and ordinary concrete, by core method, in deep foundations
nobakht bakhtyari jamshid esmaili mehdi Amri
20.1001.1.23456310.1394.12.3.5.6

Situ concrete piles, are the most widely used type of deep foundation. In Iran experience shows, that technical problems and economic performance by avoiding the use of ordinary concrete with a slump an extremely high in these types of candles. Poor and low compress res More

Situ concrete piles, are the most widely used type of deep foundation. In Iran experience shows, that technical problems and economic performance by avoiding the use of ordinary concrete with a slump an extremely high in these types of candles. Poor and low compress resistance, durability and high water permeability in the subsurface environment, the effects of this type of concrete planning. The excellent strength, permeability to ensure proper compaction, concrete ‌ ease and speed up the planning run, the significant advantages of self-compacting concrete. These benefits are especially situ concrete pile planning, most appear to be. In This paper compares core strength situ by taking samples from two typical arrangement of pile ordinary and self-compacting concrete and important results have been obtained. The core samples, to a depth of 14 m in which different levels of ground benchmark are tested show that the use of self-compacting concrete has technical  and economical advantages, and notable administrative lead to greater uniformity in resistance acquisition, located in the upper part of the pile is. This section, the maximum stresses due to vertical and lateral loads. Therefore, the use of self-compacting concrete in deep foundations, can widely replace traditional methods. Manuscript profile
Open Access Article
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3 - The Effect of Cross Beams in Retrofitting of the Roof System with Stress Regulation
Nobakht Bakhtyari
20.1001.1.23456310.1394.12.4.6.9

Plate girders structure is a major industry which is mainly used in the systems covered by these beams. Reducing deflection and decreasing the maximum bending moment can be considered as a development in methodology. By the use of cross beamsor braced beams, element per More

Plate girders structure is a major industry which is mainly used in the systems covered by these beams. Reducing deflection and decreasing the maximum bending moment can be considered as a development in methodology. By the use of cross beamsor braced beams, element perpendicular to the girders is provided. In this paper, the effect of stiffness and distance elements development are studied. Differential equation of degree four governing the  behavior of the partial structures which is a quadratic relationship is determined by solving the following mathematical transformations, and the fundamental equations are derived. The resulting equations are solved by a practical problem and the answer to the problem .The modeling  results  are  compared  with the  SAP2000 program. The findingsshow highly accurate implementation and compliance. It is also revealed  that  stiffness  changing elements within the cross can include different amounts of stress, bending moment and improved cover system. Manuscript profile

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