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Showing 4 results for Hedayatian


Volume 7, Issue 1 (4-2017)
Abstract

The Iranian architecture is one of the richest local architectural samples in the world that its achievements are undeniable. Features such as civility, autonomy, avoidance of absurdity and … were used as main branches in the architecture of ancient monuments. With advent of Islam and its spread in Iran, Iranian architecture was combined with values derived from religious and created the Iranian-Islamic rich architecture principles. In the historical monuments of Iranian cities including Boroujerd, it can be seen the application of Iranian-Islamic rich architecture such as harmony with nature, security, identity and … in that period. After decade 1300 and by opening the doors of Iran to the world countries, the western architecture entered in Iran and it has prevailed in competition with Islamic-Iranian architecture and after that, the Iranian buildings were built with western principles. The architecture that was very different with Islamic-Iranian culture and perhaps it was in conflict with it that its prominent sample can be seen in the contemporary houses including Maskan Mehr, a program which has been in the government agenda in order to provide house for low-income people.
In the last half-century, inter-family distinction has increased dramatically and its internal congruence has changed. in other hand, Urban growth and increasing middle class has increased External similarities in families. the terms as such as "middle class", "low-income group" etc are signs of "same view" viewpoint. In the West the family is known as an entity through which Most legitimate emotional and sexual relationship and wealth transfer are possible and includes parents and one or two children. Parents often work together and come home in the evenings and home is becoming dormitories. But in Iran, Families in both quality and quantity terms is more varied and multiple. Presence of children over 20 years old and relatives(Grandfather, grandmother and . . .) in a iranian home has very high possible.
Art and culture of this zone combined with new factors. Principles, customs, Religious Ceremonies, spirits, ethical, thoughts, and ideas of generations and other human features are presenting not only in massive buildings but in Small buildings, and is such entwined with the essence of existence Iranian architecture that its effect can be traced in all past Architectural monuments.
Islamic-Iranian Architecture has a bilateral relationship with nature, Such a way In all architectural monuments of the cities a summary of the nature is created. in the Islamic-Iranian city, Buildings have a central courtyard where residents have the opportunity to see the sky, stars and sun and inside it there are also waterfront and plants. So, the small-scale relationship with nature in house and in closest state is created. materials used in Building Construction include natural material and specially Soil which has not The destructive effects on natural environment and When Building is destroyed this materials are Recyclable and reusable. In addition, The orientation of these buildings is in a way which it best utilization natural factors (Sunshine, Winds, precipitations) is possible. While in some parts due to the needs by creating elements such as Windward and areas such as Bedchamber and Shvadan convert possible Natural threats into opportunities. also The use water resources is doing So that do not cause Pollution of it and maximum exploitation from this resource can be possible.
it must be said , unfortunately , Islamic architecture in iran has distanced from its Islamic and indigenous form , and created overt and covert problems , including loss of natural light location , impose many restriction . Koran's emphasis is on the home location and this residence before its physical concept have metaphysical meaning and means a dwelling and calm spirit , and it requires that templates of forms of housing in Islamic community will be realizes based on this meaning. therefore in this model , architectural pattern is prior to the mold and idea oriented . on the other hand , spirit shapes in the form and templates.
Examining the trend of change housing at different time telling the story of transformation of this space . housing pattern used prior to 1300 is very different with current pattern . home in its Iranian and also Islamic sense. House in its Iranian view is a completely enclosed space that constructed based on minorities and cultural condition of its time and use all places and circumstances in the best way. In this type of housing , there is comfort along with psychological , visual and audio security , and its residents have been living in the appropriate environment.
After 1300s , architecture of iran following West was changed that was in conflict in all areas . this contemporary home conflict is obvious . examining the Maskan Mehr in Borojerd showed this conflict better . studies show that Maskan Mehr in Borojerd have not bean constructed according to Iranian – Islamic model none of Iranian – Islamic architectural principle do not have been observed , so that with following West architecture and culture , Iranian values have been ignored and houses have been constructed similar to west's houses. In this respect the privacy( visual , audio, security) of the home have not been observed. If door is opened , you can see the interior of the house . house spaces in these houses is include closed space that most of its parts are scrambled , and person should define this space . space in these house is worth by objects not by elements such as walls . floors and ceilings.
The purpose of this study is to present an Islamic-Iranian model in the Maskan Mehr and The methodology of this thesis is descriptive-analytical that some part of its data were collected as library method and the other part is provided via field visit and completing questionnaire.
The results indicate that the Maskan Mehr in the light of architecture, based on observations and experts, features of Islamic-Iranian architecture can't be seen in that and the application of western architecture is evident inside the building and also its façade.
Mohammad Hedayatian, Gholam Hosein Liaghat, Gholam Hosein Rahimi, Mohammad Hosein Pol, Mehdi Khoshsoroor,
Volume 14, Issue 2 (5-2014)
Abstract

In this paper, the experimental behavior of grid cylindrical composite structures which are used widely in engineering structures under ballistic impact is investigated. In the present study, the grid cylindrical composites were manufactured by the filament winding process with fiber placement procedure and perforated by projectile using the ballistic gas gun. Input and output velocities of projectile were recorded. The results show that presence of discrete ribs prevents spread damage from one cell to it’s adjacent cells and structure behaves differently against projectile with velocity near ballistic limit velocity and higher velocities. With approach to the ribs location ballistic limit has been increased. However due to reduce fracture area, overall and local deformations after impact in velocity which is higher than ballistic limit velocity, projectile has been came out from grid samples with higher velocity than simple composite shells. In this paper, delamination in outer composite shell and ribs, debonding between shell and ribs, residual velocity of projectile, fracture area of the grid specimens and the effects of curvature in two deferent velocities were reported and commented upon as results.
Mohammad Hedayatian, Golamhossein Lighat, Rahimi, Mohammad Hossein Pol,
Volume 14, Issue 9 (12-2014)
Abstract

Due to the extreme increase in computational power over the recent years, numerical methods have gained the most proportion in analyzing composite structures and components because of the consideration complicated failure mechanisms such as delamination, fiber buckling and fiber breakage, matrix cracking, debonding ribs of skin and a combination of mentioned failure mechanisms. However exact three - dimensional modeling damages caused by impact phenomena is still a challenge. In present numerical work, the most advanced modeling techniques have been used to predict the behavior of composite structure under high velocity impact. The ribs and layers have been modeled using solid elements and a user defined material model with modified puck and Hashin (3D) failure criteria was implemented. Because these failure criteria do not exist in Commercial version of the Abaqus software, we have used Fortran software for writing these criteria so this capability was added to the software. Figures of velocity variations and force variations of projectile, damaged area, different mechanisms of fracture were reported as results and commented upon. In this study, The numerical results have been validated with experimental data and show very good agreement.
Reza Zamani, Gholam Hossein Rahimi, Mohammad Hossein Pol, Mohammad Hedayatian,
Volume 15, Issue 3 (5-2015)
Abstract

The current study represents the influence of nanoclay on buckling behavior of glass fiber reinforced polymer (GFRP) grid-stiffened nanocomposite shells. The nanocomposite grid shells were manufactured from continuous glass fiber using a specially designed filament winding machine. The epoxy/clay nanocomposites with different clay content (0%, 1.5%, 3% and 5% of clay) were used as the matrix of the grid stiffened structures. The state of dispersion and mechanical properties of the epoxy/clay nanocomposites were obtained by X-ray diffraction (XRD) method and uniaxial tensile test, respectively and also the grid structures were loaded under uniform axial compression test. The results of XRD show that the clay has been further intercalated by the epoxy matrix. The tensile test results represent that the tensile modulus and Strength, strain to break and energy to break of the epoxy/clay nanocomposites increase with adding clay loading into the epoxy resin. Furthermore, it is found that the critical buckling load of the cylindrical grid samples increases continuously with increasing the clay content up to 5 wt. %. The maximum value of improvement in the critical buckling load is about 10% for the samples with 5 wt. % of nanoclay.

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