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Volume 8, Issue 4 (3-2026)
KCR 2026, 8(4): 92-112 |
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Haji Nili E, Esfanjary Kenari E. A Systematic Method for Integrated Damages Assessment of Historic Structures: A Case Study of the Conservation of the Izadkhast Historic Bridge –Dam. KCR 2026; 8 (4) :92-112
URL: http://journal.richt.ir/kcr/article-1-391-en.html
URL: http://journal.richt.ir/kcr/article-1-391-en.html
Abstract: (1554 Views)
Historic bridges represent complex structural systems that have endured centuries of environmental exposure, functional transformation, and human intervention. Due to their structural configuration and location within dynamic riverine contexts, they are particularly vulnerable to natural forces, material decay, and incompatible repairs. Conservation doctrine has consistently emphasized that intervention must be grounded in knowledge. Documents such as the Venice Charter, the Burra Charter, the Nara Document on Authenticity, and the ICOMOS Principles for the Analysis and Restoration of Architectural Heritage stress that understanding a monument’s historical development, material composition, and structural performance is essential before any action is taken. Building on this understanding, the present study develops and applies an integrated damage diagnosis approach to the historic Bridge-Dam of Izadkhast. Although Iranian historic bridges have been widely studied, previous research has often addressed historical interpretation, qualitative assessment, and structural modeling separately. In many instances, laboratory testing and structural calculations were treated as isolated technical exercises rather than as components of conservation decision making. This separation has occasionally led to reinforcement strategies that exceed actual structural needs and conflict with principles such as minimal intervention and respect for authenticity. The principal research gap therefore lies in the absence of a coherent methodological framework that integrates historical studies, qualitative damage assessment, laboratory material testing, and quantitative structural behavior analysis into a unified and conservation oriented decision making model. The Izadkhast Bridge-Dam was selected as the case study because of its historical and structural importance. Located along the Historic route from Isfahan to Shiraz via Izadkhast, it once played a strategic role in regional communication and maintained a functional relationship with the nearby caravanserai. Built across a seasonal river prone to flooding, the structure was originally designed to serve caravan traffic. In later periods, however, the passage of automobiles and heavier transport introduced load conditions that had not been anticipated in the original architectural conception. As a result, the bridge was subjected to stresses exceeding its intended structural capacity. Despite these pressures, it remained functional for centuries. Only in recent decades have climatic variability, renewed water flow after extended drought, inappropriate restoration efforts, and insufficient river management significantly increased its vulnerability. The methodology adopted in this research consisted of six interconnected stages: (1) historical analysis and investigation of the structural evolution of the monument; (2) direct observation and qualitative assessment of the current condition; (3) qualitative and semi-quantitative analysis of mortars and qualitative assessment of materials; (4) structural analysis and evaluation of the overall structural behavior; (5) safety assessment through quantitative analyses and structural testing; and (6) final judgment and data integration. In this method, Laboratory investigations were conducted to determine the physical and chemical properties of mortars and bricks, and structural behavior under gravity, seismic forces, wind, and hydraulic actions was analyzed through finite element modeling using ANSYS software. The findings demonstrate that a comprehensive understanding of the monument requires the simultaneous interpretation of historical documentation, field evidence, material characteristics, and structural modeling results. Historical analysis revealed that major damage resulted from changes in function, excessive loading beyond traditional use patterns, destructive floods particularly the flood of 1956 CE. and alterations in river morphology caused by human intervention. Qualitative assessment identified inconsistencies in restoration management, incomplete conservation measures, deterioration of mortars, and neglect of riverbed maintenance as significant contributors to the bridge’s current condition. Material analyses indicated that lime mortars (cold sarooj) were intentionally employed in water exposed sections, while gypsum–lime mortars were used in arches and passageways, reflecting functional adaptation to environmental conditions. Although bricks quality was relatively low due to manufacturing and firing limitations, this characteristic forms part of the bridge’s original material system and does not in itself indicate structural weakness. Structural analyses showed that the bridge performs satisfactorily under gravitational and seismic loads. The vulnerable structural points was identified in relation to hydrodynamic flood forces and at the junction between the end piers and the natural riverbanks.
The integratetion of the obtained results indicate that most observed damages do not stem from inherent structural vulnerability, but rather from the disruption of the bridge’s historical equilibrium. Changes in functional loads, incompatible restoration materials, interruption of structural continuity, and hydromorphological alterations in the riverbed have collectively intensified deterioration. Numerical modeling confirmed that heavy structural reinforcement or radical alteration of the structural system is unnecessary. Instead, conservation efforts should focus on correcting inappropriate past restorations, locally reinforcing critical points, stabilizing and organizing the riverbed and establishing a continuous maintenance system. This study demonstrates that that quantitative structural analysis can meaningfully inform conservation decisions only when interpreted in direct connection with historical understanding and material characterization. Detached numerical assessments risk misdiagnosis and unnecessary intervention. Accordingly, the research advocates a shift from reactive, episodic restoration toward preventive and integrated management of historic bridges. Ultimately, this research proposes a transferable analytical framework for the conservation of historic bridges in Iran and comparable contexts. By integrating historical research, qualitative damage assessment, laboratory based material evaluation, structural stability assessment, and finite element analysis into a unified diagnostic process, the study provides a methodological model that supports minimal, authenticity compatible, and scientifically grounded conservation strategies, while preventing costly and irreversible interventions.
The integratetion of the obtained results indicate that most observed damages do not stem from inherent structural vulnerability, but rather from the disruption of the bridge’s historical equilibrium. Changes in functional loads, incompatible restoration materials, interruption of structural continuity, and hydromorphological alterations in the riverbed have collectively intensified deterioration. Numerical modeling confirmed that heavy structural reinforcement or radical alteration of the structural system is unnecessary. Instead, conservation efforts should focus on correcting inappropriate past restorations, locally reinforcing critical points, stabilizing and organizing the riverbed and establishing a continuous maintenance system. This study demonstrates that that quantitative structural analysis can meaningfully inform conservation decisions only when interpreted in direct connection with historical understanding and material characterization. Detached numerical assessments risk misdiagnosis and unnecessary intervention. Accordingly, the research advocates a shift from reactive, episodic restoration toward preventive and integrated management of historic bridges. Ultimately, this research proposes a transferable analytical framework for the conservation of historic bridges in Iran and comparable contexts. By integrating historical research, qualitative damage assessment, laboratory based material evaluation, structural stability assessment, and finite element analysis into a unified diagnostic process, the study provides a methodological model that supports minimal, authenticity compatible, and scientifically grounded conservation strategies, while preventing costly and irreversible interventions.
Type of Study: Research, Original, Regular |
Subject:
Evaluation of treatment methods and optimization of traditional materials in conservation and restoration.
Accepted: 2026/03/3 | Published: 2026/03/3
Accepted: 2026/03/3 | Published: 2026/03/3
References
1. Abdollahi, M & Mohseni, I. (2007). Numerical modeling and finite element analysis of historical bridges. Proceedings of the National Conference on Earthquake Engineering and Structural Retrofitting. Behbahan, Iran. https://civilica.com/doc/35224 (In Persian)
2. Abdoli, M & Eslami, R. (2012). Historical and hydrostatic analysis of Dezful Bridge. National Conference on Archeology and Architecture of Dezful Water Structures. Dezful, Iran. https://civilica.com/doc/164994 (In Persian)
3. Alizadeh, A. (2004). Principles of Applied Hydrology. Mashhad: Imam Reza University Press. )In Persian(
4. An international collection of architectural photography. (2016). Izadkhast. Retrieved May 10, 2020, from https://www.larryspeck.com.
5. Archnet. (2003). Qal‘ah-i Izadkhvast. Retrieved May 10, 2020, from https://archnet.org.
6. Bayat, R, Pashabandpuri, M.A & Ghorbi, E. (2012). Implementation of special railway bridges with a focus on Izadkhast Bridge (Isfahan–Shiraz railway). In Proceedings of the National Conference on Applied Civil Engineering and New Achievements. Karaj, Iran. https://civilica.com/doc/255636 (In Persian)
7. Brugsch, H. (1988). A journey to the court of Sultan Sahibqaran. M. Kordbacheh, Trans. Tehran: Ettelaat Publication. )In Persian(
8. Building and Housing Research Center (BHRC). (2013). Iranian code of practice for seismic resistant design of buildings (Standard No. 2800). Tehran. (In Persian (
9. Croci, G. (2018). The Conservation and Structural Restoration of Architectural Heritage. B. Ayatollahzadeh Shirazi & M. Hejazi, Trans. Tehran: Cultural Research Bureau. )In Persian(
10. E--manuscripta. (1982). Persien, Jesdegad (Jäz-de-chast, Jesdichast). Retrieved August 15, 2022, from https://www.e-manuscripta.ch
11. Esfanjary, E. (2017). Project of documenting, identifying, and introducing the historical–cultural complex of Izadkhast. Fars Province: General Department of Cultural Heritage, Handicrafts and Tourism. (In Persian)
12. Esfanjary, E & Sotoodeh, E. (2024). Cultural landscape of Izadkhast. In R. Vatan-Doust (Ed.), About conservation (pp. 350–372). Tehran: Dadkhin Publications. (In Persian)
13. Eslami, Sh, Rahimnia, R & Khanjari Mianeh, M. (2021). Structural Analysis and Vulnerability on Historical Structures; An Experience for Preventive Conservation in Small Tower of Semiran. Journal of Structural and Construction Engineering, 8(9), 337-352. )In Persian(
14. Fars Meteorological Organization. (2020). Monthly statistical report of Fars Province. Retrieved March 7, 2020, from www.farsmet.ir. (In Persian)
15. Fayyazi, M, Heydari Bani, D & Iman Talab, H. (2015). Geometrical analysis in the construction of the historical Banosahra Bridge. The First International Conference on Arts, Crafts and Tourism. Shiraz, Iran. https://civilica.com/doc/543506 (In Persian)
16. Fayyazi, M, Heydari Bani, D & Iman Talab, H. (2016). Technological analysis of mortars used in the Banoo-Sahra Bridge based on XRF and XRD analyses. Athar Quarterly, 36(71), 109–114. (In Persian)
17. First consulting engineers of Tehran. (2000). Synthesis of comprehensive studies on revitalization and development of agriculture and natural resources in Fars province (surface water). Tehran. )In Persian(
18. Flandin, E. (1977). Travel in Iran. H. Mirsadeghi, Trans. Tehran: Eshraghi Publications. )In Persian(
19. Flickr. (2009). Izadkhast. Retrieved May 10, 2020, from https://www.flickr.com
20. Field, H. (1964). Anthropology of Iran. A. Faryar, Trans. Tehran: Ibn Sina Library Publications. )In Persian(
21. General Department of Cultural Heritage, Handicrafts and Tourism of Fars Province. (1975). Registration file of Izadkhast Bridge (Registration No. 1110). Fars, Iran. (In Persian(
22. General Department of Cultural Heritage, Handicrafts and Tourism of Fars Province. (2017). Safavi bridge restoration report. Fars, Iran. (In Persian (
23. Hashemi Esfahanian, M & Heydari, M. (2017). Geological report of the Izadkhast historical–cultural complex. Fars Province: General Department of Cultural Heritage, Handicrafts and Tourism. (In Persian)
24. Heydari, D. (2016). Analysis of cracks caused by foundation settlement in historical brick walls (Doctoral dissertation). Art University of Isfahan, Iran.)In Persian(
25. ICOMOS. (1964). International Charter for the Conservation and Restoration of Monuments and Sites (Venice Charter). Venice: ICOMOS.
26. ICOMOS. (1994). The Nara Document on Authenticity. Nara: ICOMOS.
27. ICOMOS. (1999). Bura Charter for the Conservation of Historic Towns and Urban Areas. Bura: ICOMOS.
28. ICOMOS. (2003). Principles for the Analysis, Conservation and Structural Restoration of Architectural Heritage. Paris: ICOMOS.
29. ICOMOS. (2015). Iranian Caravanserais: Nomination dossier for the World Heritage List. UNESCO World Heritage Centre.
30. ICOMOS. (2017). Principles for the conservation and management of water-related heritage. Paris: International Council on Monuments and Sites.
31. International :union: of Railways. (2011). Recommendations for the inspection, assessment and maintenance of masonry arch bridges. Paris: UIC.
32. Khayat Rostami, B & Hasanzadeh, Y. (2014). Investigating the effect of floodwater on the transformation of span geometry in the architecture of historical bridges. First National Conference on Sustainable Development in Geography and Planning, Architecture and Urban Planning. Tehran, Iran. https://civilica.com/doc/336798 (In Persian)
33. Management and Planning Organization of Iran. (2002). Guidelines for determining erosion depth and mitigation methods in bridge areas. Tehran. (In Persian)
34. Management and Planning Organization of Iran. (2012). Guidelines for seismic rehabilitation of existing buildings (Publication No. 360). Tehran. (In Persian (
35. Mirdarikvandi, M, Haj Ebrahim Zargar, A & Heydari Bani, D. (2016). Identification of ancient mortars of the Shapouri Bridge in Khorramabad and feasibility assessment of their use in bridge conservation through laboratory methods. Iranian Journal of Restoration and Architecture, 5(9), 45–58. (In Persian)
36. Mokhlesi, M. (2000). Ancient bridges of Iran. Tehran: Iran Cultural Heritage Organization. (In Persian (
37. Mostafanejad, A, Karimi, AH & Montazeralghaem, M. (2019). Investigation of mortars used in historical bridges of Lorestan Province. Proceedings of the 3rd National Conference on Modern Academic Research in Art, Architecture and Civil Engineering. Tehran, Iran. https://civilica.com/doc/1255232 (In Persian)
38. National Library and Archives of Iran. (1956). Restoration of Izadkhast Bridge and construction of an adjacent road. Retrieved July 25, 2022, from http://opac.nlai.ir/opac-prod/bibliographic/4407159 (In Persian)
39. Negaristan Mahur Consulting Engineers. (2013). Comprehensive-detailed plan of Izadkhas city (Vol. 2). Fars Province. )In Persian(
40. Pirhayati, M. (2024). Interpreting construction techniques and indigenous knowledge in the architecture of historical bridges of Lorestan during the flourishing period of the Hasanwayhid dynasty (the era of Badr ibn Hasanwayh). Iranian Journal of Indigenous Knowledge, 11(22), 254–291. (In Persian)
41. Pirzadeh Naini, M. (1963). Haji Pirzadeh Naini's travelogue. Tehran: Tehran University Press. )In Persian(
42. Ranjbar, H, Izadi, M & Amini, A. (1994). Land and culture of the people of Izadkhast. Tehran: Ayat Cultural Institute. )In Persian(
43. Tahouni, Sh. (2018). Bridge design. Tehran: University of Tehran Press. )In Persian(
44. UNESCO World Heritage Centre. (2005). Operational guidelines for the implementation of the World Heritage Convention. Paris: UNESCO.
45. Varjavand, P. (1972). The Ancient Castle of Izadkhast and its Historical Monuments. Journal of Historical Studies, 1 (7), 57-72. )In Persian(
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