| Summary: | 碩士 === 國立成功大學 === 土木工程學系碩博士班 === 96 === The purpose of this paper is to study the behavior of the beam of self-compacting concrete (SCC) beam-column sub-assemblage under elevated temperature.
In the experiment study, the specimen of full scale beam-column sub-assemblage was built to simulate the beam, column and joint sub-assemblage of the outer column at the second floor in a seven-story building. There were three phases in the experiment work, i.e., heating period, cooling period and residual strength test after heating. The heating with elevated temperature followed the ISO 834 temperature-time curve and lasted for 3 hours. After heating, the cooling period took about 15 hours. Finally, the residual strength of the specimen was tested. In the analytical study, ANSYS software was used to analyze the variation of inner temperature of beam cross section and the deformations of the specimen.
The main results of the research are as follows:
1. Obvious explosion and spalling behavior was observed during the heating period, and after that, the deflection of beam was around 8.5 to 10 times greater than that under room temperature. Besides, the beam end rotation and displacement were 8.7 and 24.0 times greater than those under room temperature.
2. The deflection, beam end rotation and horizontal displacement of beam reached their maximum values at about an hour after the cooling period started. They were approximately 10, 9.5 and 24.3 times greater than those under room temperature.
3. In the residual strength test, the deflection of beam increase significantly due to its material strength deterioration. At the column load of 1725KN, the deflection of beam under service load increased 1.88 to 2.09 times comparing with that before the test. Moreover, the total load of beam at failure was about 0.78 times of that under room temperature.
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