英文摘要
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Tall buildings are getting taller and taller in the mega cities all over the globe. The need of using SM570M-CHW high-strength steel for building constructions in Taiwan is increasing. In order to transfer the beam moment, diaphragms at the beam flange elevations are often welded into the built-up box column using the electro-slag welding (ESW). However, the elevations of the diaphragm, the ESW and the beam flange may not be perfectly aligned. This could be caused by the fabrication error or the slight difference of the depths of two beams framing into the column. The misalignment in beam flange and diaphragm, with or without the eccentricity of ESW, may lead to the brittle fracture due to stress concentrations near the ESW to column flange heat affected zone (HAZ). This study uses the damage prediction model proposed by Kanvinde and Deierlein to investigate the damage potential of ESW component specimens using SM570M-CHW steel with the eccentricity between the beam flange and the ESW. The Abaqus model analysis results are compared with the experiment observations.
The ESW component was constructed from a SM570M-CHW steel 500×500×28mm box column with 200×28mm beam flanges. The ESW eccentricity was measured using ultrasonic tests (UT), specimens with various eccentricities between the beam flange and the diaphragm were constructed.
The damage prediction models are applied to predict the critical strength and displacement of the ESW components test results. Experiment and analysis results suggest that the eccentricity between the beam and the diaphragm must be no greater than three fourth of the column flange thickness in order to prevent the brittle fracture at the HAZ. The analytical results with varying column thickness indicate that increasing the column flange thickness reduces the abovementioned fracture potential effectively.
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