A Study on Structural Behaviors of Steel Building Beam-to-Column Connections in Fire

• Main Authors: Chen-HungLee, 李鎮宏
• Other Authors: Hsin-Yang Chung
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/79375187475749047197

博士 === 國立成功大學 === 土木工程學系碩博士班 === 100 === This research presented a series of tests for steel beam-to-column moment connections in fires. Four full-scale beam-to-column moment connection specimens were tested at elevated temperatures according to the standard ISO-834 fire. The test results showed that the critical temperature of the side-plate strengthened moment connection was higher than the other three types of the beam-to-column connections. This dissertation also developed a sequentially coupled fire-structure analysis model to assess the boundary conditions between the fire simulation and structural analysis. “Wall Temperatures” obtained from FDS were used as the parameter for fire exposure on structural elements. Data transfer between the computational fluid dynamics fire model and the finite element thermal and structural model was established. The certifications of simulation results included gas temperatures in the furnace, solid surface temperatures on the specimens and deformation of the beam-column sub frames. Through the comparison with the exact test results, it has shown that the analysis model gives relatively close simulation results; thus, this proved that the sequentially coupled fire-structure analysis model could efficiently analyze the large deformation behaviors for steel structures at high temperatures. Besides, this dissertation also performed numerical fire simulation analysis for the case studies of single-compartment on fire. The numerical simulation results agree well with the related single-compartment fire experiment results in the compartment temperature distribution and the surface temperature distribution of structural components. This proves the accuracy of the developed numerical fire simulation analysis model. This model also extended to the application in the sequentially coupled fire-structure analysis for the single-story, multiple-bay and multiple-room compartment on fire. The further discussions of different fire ignition locations and opening sizes in the single-level, multiple-bay and multiple-room compartment model demonstrates the feasibility of the sequentially coupled fire-structure analysis which combines the numerical fire simulation and finite-element analysis.