Comparative Study of Spatial Structure, Formation and Distribution Pattern of Fortresses Qajar and Pahlavi Periods in Darreh - Shahr, Ilam Province

The monuments of Qajar and early Pahlavi periods in the valley of Darreh-Shahr of Ilam province are among the works that reflect the political and social developments of this era. The purpose of this study is to investigate the adaptive study of the spatial and temporal structure of Ghala Poursharf, Mirgholam Hashemi and Ghaleh Jahangirabad, the causes of their formation and pattern of distribution. The research method in this study was experimental research, field and library studies. In this regard, by studying the architectural elements each of the buildings, the Appellation of them according to their spatial-physical structure is to be re-evaluated. The results of the research are show that the construction of the studied buildings in the city of Darreh-Shahr, according based on military and security necessity and then on political and social grounds. The results of the research are show that the construction of the studied buildings in the city of Darreh-Shahr, have been according based on military and security necessity and then on political and social grounds. These buildings are located at the most appropriate geographical locations and related to agricultural affairs and tax affairs. On the other hand, according to architectural and archaeological studies, other buildings of Pourashraf fortress, has been built on the basis of military and security necessity, and the buildings of Mirgholam Hashemi and Jahangirabad have been manor house and where built at the beginning of the Pahlavi period for political and social reasons. So, in this study, these questions are raised: What is the pattern of distribution of these buildings in Darreh-Shahr? How are the spatial structure of these buildings? Can be used the title of fortress for these buildings?