Investigating stages of physical growth and development in the cities of the world indicates the effect of two paradigms of modernism and postmodernism on the organization and spatial structure of cities. So that the effects of these two paradigms have led to the development of cities, the establishment and development of communication networks and highways, the creation of satellite towns and suburbs , and the greatest impact on the spatial and physical area of cities. Modernism and the effect of that modernity have had fundamental effects on the social, political, economic, cultural and physical spheres and most of all targeting the transformation of the urban community, including the city's physical-spatial dimensions, also they have greatly changed the concepts of urban culture. On the other hand, postmodernism has also had an impact on the spatial structure of city in terms of economic, social, political and methodological issues. In this regard, the purpose of this study is to evaluate the spatial structure of Tehran metropolis from the perspective of modernism and postmodernism. The methodology of this research is descriptive-analytic and data collection is based on library and documentary studies. The results show that in modernism, components such as the physical viewpoint and single-dimensional urbanization, the creation of space spheres such as the creation of highways, air networks and architecture and high-rise construction and beady, respectively, were in the first to third positions, also in postmodernism components such as the mixed use and the diversity of housing construction, the existence of the principle of choice in the structure of city, and the average density and combined use of the combination, played a role in the first to third positions in terms of influencing the spatial structure on Tehran metropolis.
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