| Summary: | 碩士 === 國立成功大學 === 土木工程學系碩博士班 === 99 === This study employed a seven-story steel building frame as an example, and utilized a three-dimensional nonlinear finite-element program to simulate the structural behaviors of this steel building frame in first-floor fire. Furthermore, this study also utlized different strategies to distribute fire-resistant steel columns and beams in this steel building frame and discussed the fire-resistant performance of each strategy. Two types of frame models were employed in this study for test and analysis. One is the single-story frame model and the other one is the seven-story frame model. The single-story frame model was directly taken from the first-floor portion of the original seven-story frame model. Both frame models used CNS 12514 (ISO-834) temperature-time heating curve to heat the first-floor structural members including beams, columns and deck. First, the single-floor frame model was utilized to test the fire-resistant performance of different distribution strategies of fire-resistant steel columns and beams respectively. After the optimal fire-resistant steel column distributions and beam distributions in the single-floor frame model were obtained, these strategies were then applied to the seven-story frame model for the following detailed analysis and comparison. The numerical simulation results show that using fire-resistant steel interior columns and interior beams in the single-story frame model was the most effective and economic strategy in fire. Compared to the single-story frame model, the seven-story frame model had the better fire-resistant performance and could prevent the collapse of interior columns in fire due to force redistribution. The two fire-resistant steel distribution strategies tested in the seven-story frame model could effectively improve the failure temperature of the frame in which using fire-resistant steel interior columns and interior beams was more economic.
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