https://scholars.lib.ntu.edu.tw/handle/123456789/576028
標題: | Seismic fracture evaluation of diaphragm joints in welded beam-to-box column moment connections | 作者: | Tsai C.-Y Tsai K.-C Li C.-H Wu C.-C Lin K.-C Jhuang S.-J. KEH-CHYUAN TSAI |
關鍵字: | Electroslag welding; Finite element method; Flanges; Forecasting; Heat affected zone; Slags; Tensile testing; Analytical results; Fracture prediction; Loading protocols; Material parameter; Premature fracture; Relative location; Steel box columns; Steel Building Structures; Fracture; column; earthquake damage; finite element method; fracture mechanics; loading; plastic deformation; prediction; welding; Taiwan | 公開日期: | 2020 | 卷: | 49 | 期: | 13 | 起(迄)頁: | 1344-1362 | 來源出版物: | Earthquake Engineering and Structural Dynamics | 摘要: | Steel box columns are widely used in steel building structures in Taiwan due to their dual strong axes. To transfer the beam-end moment to the column, diaphragm plates of the same thickness and elevations as the beam flanges are usually welded inside the box column. The electro-slag welding (ESW) process is widely used to connect the diaphragms to the column flanges in Taiwan because of its convenience and efficiency. However, ESW may increase the hardness of the welds and heat-affected zones (HAZs), while reducing the Charpy-V notch strength in the HAZ. This situation can cause premature fracture of the diaphragm-to-column flange welds before a large plastic rotation is developed in the beam-to-box column joints. To quantify the critical eccentricity and the effectiveness of fracture prediction, this study uses fracture prediction models and finite element model (FEM) analysis to correlate the test results. In this study, two beam-to-box column connection subassembly tests are conducted with different loading protocols and ESW chamber shapes. To implement a fracture prediction model, the material parameters are established from circumferential notched tensile tests and FEM analysis. Test results indicate that the fracture instances can be predicted on the basis of the cumulative plastic deformation in the HAZs. Analytical results indicate that fracture instances and locations are sensitive to the relative locations of the ESW joints and beam flange. Tests also confirm that the possible fracture of the diaphragm-to-column flange joints can be mitigated by enlarging the chamber of the ESW joint. ? 2020 John Wiley & Sons, Ltd. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85087301180&doi=10.1002%2feqe.3293&partnerID=40&md5=c4791617edd12ed8572c0943e8ffd3dc https://scholars.lib.ntu.edu.tw/handle/123456789/576028 |
ISSN: | 988847 | DOI: | 10.1002/eqe.3293 |
顯示於: | 土木工程學系 |
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