Experiment on Fire Resistance of Axial Compression Rec-section High Strength Steel Columns
Runmin Ding 1, Shenggang Fan 1* and Yunlong Han 1, Yang Guo 1, Bingbing He 2
1 Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, School of Civil Engineering, Southeast University, Sipailou #2, Zip: 210096, Nanjing, China.
2 East China Architectural Design & Research Institute, Shanghai, China
To investigate the behavioral responses and failure mechanism of axially compressed Q550 high-strength steel rectangular-section columns in fire, a series of tests were carried out including 4 mechanical property test coupons at normal temperature, 18 mechanical property test coupons at high-temperature and 8 specimens of axially compressed Q550 high-strength steel rec-section columns without constraint. Six influencing parameters, including cross-sectional area A, width-to-thickness ratio B/t, initial bending amplitude e0, slenderness ratio λ, load ratio n, width-to-thickness ratio H/B, on the fire resistance of Q550 high-strength steel axially compressed rectangular columns were parametrically analyzed by using exact finite element model. The furnace temperature-time curves, the surface temperature-time curves, the axial displacement-time curves, the mid-span lateral displacement-time curves, the critical temperatures and the maximum axial displacements of specimens were obtained. The test results show that the load ratio n is the key factor determining the critical temperature of axially compressed high-strength steel columns.
High strength steel; Fire resistance; Axially compressed; Critical temperature; Parameter analysis