Defect Tolerance for Cast Steel Connections in Braced Frames
Publication: Journal of Structural Engineering
Volume 138, Issue 12
Abstract
During the last decade, various steel casting products for steel building structures have been developed, such as connectors between brace members and gusset plates in braced frames. Some casting products are welded to steel sections such as tubular members and I-section members in building structures, where these members are expected to develop their capacity during a large-scale earthquake. In this situation, brittle fracture can be another concern of the casting products if there are defects in the connections. A study of defect tolerance for cast steel connections is therefore very important to prevent brittle fracture from weld defects or casting defects. This paper describes defect tolerances for cast steel connections in braced frames and explores the possibility of brittle fracture from assumed defects in typical cast steel connectors. A parametric study, which investigates the sensitivity of brittle fracture to defect size, defect location, and material mismatch effects, is described through cast steel connector models. A toughness scaling model is used for evaluating the occurrence of brittle fracture from assumed defects in the models.
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References
Anderson, T. L., and Dodds, R. H., Jr. (1991). “Specimen size requirements for fracture toughness testing in the ductile-brittle transition region.” J. Test. Eval., 19(2), 123–134.
ASTM. (2000). “Standard specification for steel castings, carbon, and alloy, with tensile requirements, chemical requirements similar to standard wrought grades.” ASTM-A958-00, West Conshohocken, PA.
Bai, Y., and Bai, Q. (2005). Subsea pipelines and risers, Elsevier, Amsterdam, Netherlands.
British Standards Institution (BSI). (1991). “Fracture mechanics toughness tests—Part 1: Method for determination of KIc, critical CTOD and critical J values of metallic materials.” BS7448-1, London.
British Standards Institution (BSI). (2005). “Guidance on methods for assessing the acceptability of flaws in metallic structures.” BS7910, London.
Canadian Standards Association (CSA). (2004). “General requirements for rolled or welded structural quality steel/structural quality steel.” CAN/CSA-G40.20-04/G40.21-04, Toronto.
de Oliveira, J. C., Packer, J. A., and Christopoulos, C. (2008). “Cast steel connectors for circular hollow section braces under inelastic cyclic loading.” J. Struct. Eng., 134(3), 374–383.
Fell, B. V., Kanvinde, A. M., Deierlein, G. G., and Myers, A. T. (2009). “Experimental investigation of inelastic cyclic buckling and fracture of steel braces.” J. Struct. Eng., 135(1), 19–32.
Folch, L. C. A., and Burdekin, F. M. (1999). “Application of coupled brittle–ductile model to study correlation between Charpy energy and fracture toughness values.” Eng. Fract. Mech., 63(1), 57–80.
Haldimann-Sturm, S. C., and Nussbaumer, A. (2008). “Fatigue design of cast steel nodes in tubular bridge structures.” Int. J. Fatigue, 30(3), 528–537.
Herion, S., de Oliveira, J. C., Packer, J. A., Christopoulos, C., and Gray, M. G. (2010). “Castings in tubular structures—The state of the art.” Proc., Inst. Civil Eng. Struct. Bldg., 163(SB6), 403–415.
Inoue, K., et al. (1997). “Full-scale test on plastic rotation capacity of steel wide-flange beams connected with square tube steel columns. Part 5: Discussion on fracture property and plastic deformation capacity.” Steel Construct. Eng., 4(16), 89–104 (in Japanese).
Iwashita, T., and Azuma, K. (2012). “Effect of plastic constraint on brittle fracture in steel: Evaluation using toughness scaling model.” J. Struct. Eng., 138(6), 744–752.
Iwashita, T., Kurobane, Y., and Azuma, K. (2008). “Simplified micromechanics model to assess constraint effect on brittle fracture at weld defects.” Proc., 12th Int. Symp. in Tubular Structures, Taylor & Francis, Shanghai, China, 127–134.
Iwashita, T., Kurobane, Y., Azuma, K., and Makino, Y. (2003). “Prediction of brittle fracture initiating at ends of CJP groove welded joints with defects: Study into applicability of failure assessment diagram approach.” Eng. Struct., 25(14), 1815–1826.
Jutla, T., and Garwood, S. J. (1987). “Interpretation of fracture toughness data.” Metal Construct., 19(5), 276–281.
Japan Welding Engineering Society (JWES). (1997). Seminar for earthquake damage and steel in steel structures, The Japan Welding Engineering Society, Tokyo (in Japanese).
Knott, J. F. (1973). Fundamentals of fracture mechanics, Butterworths, London.
Minami, F., Ochiai, T., Hashida, T., Arimochi, K., and Konda, N. (2000). “Fatigue and fracture mechanics: 31st volume.” STP 1389, ASTM, West Conshohocken, PA, 271–304.
Nakagomi, T., and Tatsumi, Y. (2006). “Study on brittle fracture of welded joint with weld defects based on local fracture approach.” J. Struct. Construct. Eng., 74(610), 169–176 (in Japanese).
Ochi, K., Kurobane, Y., Makino, Y., Uematsu, E., Nakano, K., and Kitano, T. (1999). “Testing of beam-to-column connections with external stiffener rings in cast steel: Part 3—Subassembly frames under cyclic loads.” Proc., Summaries of Technical Papers of the Annual Mtg. of the Architectural Institute of Japan, Vol. C1, Architectural Institute of Japan, Tokyo, 513–514 (in Japanese).
Ohata, M., Handa, T., Mimura, H., Tagawa, T., and Minami, F. (2006). “Guideline for determination of Weibull parameter.” 9th European Mechanics of Materials Conf., MINES ParisTech, Paris.
Ohata, M., Minami, F., and Toyoda, M. (1996). “Local approach to mis-match effect on cleavage fracture of notched material.” J. Physics, 6(C6), 269–278.
Puthli, R., Herion, S., and Veselcic, M. (2009). “Fatigue of end-to-end CHS connections.“ CIDECT Final Rep. 7W-9/08, Univ. of Karlsruhe, Karlsruhe, Germany.
Veselcic, M., Herion, S., and Puthli, R. (2006). “Selection of butt-welded connections for joints between tubulars and cast steel nodes under fatigue loading.” Proc., 11th Int. Symp. and IIW Int. Conf. on Tubular Structures, Taylor & Francis, Québec, 585–592.
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Published In
Journal of Structural Engineering
Volume 138 • Issue 12 • December 2012
Pages: 1455 - 1464
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Feb 22, 2011
Accepted: Feb 17, 2012
Published online: Feb 22, 2012
Published in print: Dec 1, 2012
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