Wind-moment design of semi-rigid un-braced steel frames using cruciform column (CCUB) section
Tóm tắt
The design of un-braced frames using wind-moment method (WMM) with cruciform column (CCUB) section as vertical member is presented here. Steel frames on a regular grid with approximately equal column spacings in the y-y and z-z direction using UC/UB sections has resulted in minor axis controlled the design, which leads to a significant loss in performance. The use of CCUB sections with equal I
y
and I
z
warrants an equal behaviour in both directions whilst ensuring that both the major and minor axis beam to column connections remain straightforward. The study has been conducted on 2-bay and 4-bay plane frames with 2, 4, 6 and 8 storey heights, and two different load cases are considered: minimum wind load in conjunction with maximum gravity load and vice versa. Structural design optimization of steel frames was conducted on the selection of steel sections for beam and column. The selection was carried out in such a way that the steel frame had the minimum weight while the performance of the structure was within the limitations described by BS EN 1993-1-1: 2005. Significant column weight savings (between 17–66%) was achieved by using CCUB section in the design, as compared to conventional UC sections.
Tài liệu tham khảo
Anderson, D., Reading, S. J., and Kavianpour, K. (1991). Wind-moment design for un-braced frames. Publication No. 082, Steel Construction Institute.
BSI (2000). BS 5950: Part 1. Structural Use of Steelwork in Building Part 1: Code of Practice for Design — Rolled and Welded Sections. British Standards Institution, London.
BSI (2002). Eurocode 0: Basis of structural design. British Standard Institution, London.
BSI (2005a). Eurocode 1: Actions on structures — Part 1-4: General actions — Wind actions. British Standards Institution, London.
BSI (2005b). Eurocode 3: Design of steel structures — Part 1-1: General rules and rules for buildings. British Standard Institution, London.
Brown, N. D., Anderson, D., and Hughes, A. F. (1999). Wind-moment steel frames with standard ductile connections. Civil Engineering Research Report CE61. University of Warwick.
Chen, W. F. and Rentschler, G. P. (1980). “Tests of beam-tocolumn web moment connection. Journal of the Structural Division, ASCE, 106(ST5), pp. 1005–1022.
Graham, J. D., Sherbourne, A. M., Khabbaz., R. N., and Jensen, C. D. (1959). Welded interior beam-to-column connections. A.I.A. file No. 13-C, AISC Publication.
Hensman, J. S. and Nethercot, D. A. (2001). “Design of unbraced composite frames using the wind-moment method.” The Structural Engineer, 79, pp. 28–32.
Hensman, J. S. and Nethercot, D. A. (2001). “Numerical study of unbraced composite frames: generation of data to validate use of the wind moment method of design.” Journal of Constructional Steel Research, 57, pp. 791–809.
Hensman, J. S. and Way, A. G. J. (2000). Wind-moment design of unbraced composite frames. Publication No. 264, Steel Construction Institute.
Janss, J., Jaspart, J. P., and Maquo, R. (1988). Strength and behaviour of in-plane weak axis joints and of 3-D joints. Connections in Steel Structures: Behaviour, strength and design. Elsevier Applied Science.
Salter, P. R., Couchman, G. H., and Anderson, D. (1999). Wind-moment design of low rise frames. Publication No. 263, Steel Construction Institute.
Shek, P. N. (2009). Structural behaviour of built-up steel sections using partial strength connections. Ph.D. Thesis, Universiti Teknologi Malaysia, Malaysia.
Tahir, M. M. (1997). Structural and economic aspects of the use of semi-rigid joints in steel frames. Ph.D. Thesis, University of Warwick, United Kingdom.
Tahir, M. M., Shek, P. N., Sulaiman, A., and Tan, C. S. (2009). “Experimental investigation of short cruciform columns using universal beam sections.” Construction and Building Materials, 23, pp. 1354–1364.
Wood, R. H. and Roberts, E. H. (1975). “A graphical method of predicting side-sway in multi-storey buildings.” Proc. Institution of Civil Engineers- Civil Engineering (Structures and Buildings), 59, pp. 353–272.