Introduction
Fire hazards pose a significant threat to historical urban fabrics, particularly in densely built environments such as traditional bazaars. The Historic Bazaar of Tabriz, recognized as a UNESCO World Heritage Site, exemplifies a complex architectural and socio-economic system vulnerable to fire due to its age, material composition, and spatial configuration. This study investigates the architectural components that contribute to fire vulnerability and explores design strategies that can mitigate such risks without compromising the cultural integrity of the site.
The research is motivated by recent fire incidents in Iranian bazaars, which have highlighted the urgent need for preventive architectural planning. By focusing on the Tabriz Bazaar, the study aims to identify spatial, structural, and material factors that influence fire propagation and containment, offering insights applicable to similar historical contexts.
 
Methodology and Analytical Framework
The research adopts a mixed-method approach, combining qualitative spatial analysis with quantitative risk assessment. Key architectural elements—such as passage width, roofing systems, material flammability, ventilation, and access routes—were examined through field surveys, archival documentation, and expert interviews.
Spatial mapping was conducted using GIS tools to identify high-risk zones based on circulation density and structural typology. Fire vulnerability indices were developed by integrating architectural parameters with historical fire data. The study also employed comparative analysis with other bazaars (e.g., Isfahan and Shiraz) to contextualize findings.
 
Data Analysis and Interpretation
The data revealed several critical architectural factors contributing to fire vulnerability:

Narrow and enclosed passageways: These restrict access for firefighting equipment and hinder evacuation, especially during peak commercial hours.
Wooden roofing and load-bearing elements: Common in older sections of the bazaar, these materials exhibit high flammability and accelerate fire spread.
Lack of compartmentalization: The continuous spatial flow between shops and corridors facilitates rapid fire transmission.
Insufficient ventilation and smoke outlets: Poor airflow exacerbates heat accumulation and smoke density, increasing health risks and structural damage.
Limited emergency access points: The bazaar’s organic growth over centuries has led to a labyrinthine layout with few direct routes for emergency response.

Statistical modeling showed that zones with higher commercial density and older construction materials had a 60–75% greater risk of fire escalation. Interviews with municipal engineers and heritage conservationists underscored the tension between preserving historical authenticity and implementing modern fire safety measures.
 
Results
The study identified five architectural components as most influential in reducing fire vulnerability:

Widening and restructuring key passageways to allow emergency access without altering historical facades.
Replacing or treating wooden elements with fire-retardant materials that mimic traditional aesthetics.
Introducing modular compartmentalization through subtle architectural interventions to limit fire spread.
Installing passive ventilation systems that align with the bazaar’s spatial logic and heritage constraints.
Designing integrated fire detection and suppression systems tailored to the bazaar’s unique morphology.

These interventions were modeled in simulation scenarios, demonstrating a potential 40–55% reduction in fire damage under controlled conditions.
 
Conclusion
The Historic Bazaar of Tabriz presents a compelling case for reconciling architectural heritage with contemporary safety imperatives. This study underscores the importance of spatial logic, material selection, and access planning in mitigating fire risks. While structural interventions must respect the cultural and historical value of the site, strategic architectural modifications can significantly enhance resilience.
The findings advocate for a multidisciplinary approach involving architects, urban planners, fire safety engineers, and heritage experts. Future research should explore adaptive reuse strategies and community-based fire preparedness programs to ensure sustainable protection of Iran’s architectural heritage.