An Analysis of the Mantle Structure of the Safavid Bridge Span (Case Study: Thirty-Three Bridges, Marnan, Khaju, Joey)

The purpose of this study was to investigate the correlation between the design of crater width, crater height and base widths of four poles, Thirty-Three bridges, Khajou, Joey, and Marnan, constructed on the Zayandehrood River, and to explore the relationship between these variables underpins the theory that The form of these bridges is a direct function of their main function.

In this study, due to the high volume of data, the research method is based on Python coding and working with artificial intelligence algorithms that, after harvesting the required data and performing various calculations of the files in CSV format, and then considering field harvesting, openings four bridges were simulated in related software using the cosine relation of all openings and plots were plotted.

 The findings of this study suggest that there is a high similarity and a close relationship between the width and height of the craters on each bridge with that bridge itself and the three other bridges on the river, and the design of these bridges is less than a century old despite historical differences.

In conclusion, it should be stated that the more the historical period of the construction of the bridges is focused on the past, the wider the bridges are and according to the drawing diagrams of the openings of each bridge, they have high accuracy in design and construction. The 75-span bridge has a similarity percentage of 70 to 90, which is very similar to the 33 bridges and Khajoo bridge, and the bridge search and thirty-three bridges are the lowest. It can now be said that these bridges are designed based on their performance and according to the standards of that period, construction technology, available materials and suitable for climatic conditions and river water flow calculations.