Investigation of structural behavior of steel buildings in different fire scenarios

Steel buildings are now widely used due to its better mechanical qualities, reliability, light weight, quick construction time, and ability to be reused (recycled). Steel constructions, on the other hand, suffer unfavorable significant damage in the event of a fire. As a result, varied and diverse precautions must be taken to limit fire-related damages in terms of life and property protection. Mechanical properties change as a result of the severity of the fire in the steel structural elements that are affected by the fire. The post-fire performance of the strengths and structural elements of fire-damaged steel buildings was investigated in this thesis. For this purpose, it is predicted that scenario fires will occur at various temperatures in the eight-story steel building, which is intended for one floor, the first three floors, and the entire structure, and as a result, changes in the designed steel structure's strength are taken into account. Furthermore, the critical temperatures of the main load-bearing structural elements are determined as both fire-protected and non-fire-protected, and how and how much the decrease in strength at these critical temperatures will affect structural performance, as well as the loads that will affect the existing building, has been thoroughly investigated. Steel columns and beams are expected to be protected with box gypsum board and spray-coated paint. The box gypsum board coating had values in the range of 13.5 mm - 16 mm, and the mineral fiber spray paint coating had values in the range of 18 mm - 22 mm, among the protection elements.