Bearing Capacity Analysis for Statically Indeterminate Attachment System of Tower Crane Considering Single Limb Instability

Abstract:

The tower cranes need constantly attaching to rise in the construction of high-rise buildings. The tower body which sets attached frames combined with the four-rod-type unilateral statically indeterminate attachment system is a common form. With the attachment height and distance increasing, the attachment rods become more delicate and flexible. It is necessary to check the overall and local stability of the attachment structure. When a single limb instability happens, the reduced-order variation structure brings about the redistribution of internal forces. The anti-buckling capability depends on the structure of variation. To the condition that the single limb instability occurrs on the component which has the weakest stiffness, an exact internal force expression of the structure under composite loads has been deduced in terms of the moment equilibrium method. At the same time, the decoupling support stiffnesses of the attachment device in each direction have been obtained by the unit load method. Based on the refined calculation model, the internal forces are further analyzed under the condition that the instability rod bears the fixed Euler critical force, and the structural strength and stability capacity has been judged. The calculation result proves that the whole structure has great bearing potential after a local buckling.

• Periodical: Applied Mechanics and Materials (Volumes 446-447)
• Pages: 463-468
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.446-447.463
• Online since: November 2013
• Authors: Nian Li Lu, Shu Rui Wen
• Keywords: Flexible Attachment, Internal Force, Single Limb Instability, Structure of Variation, Tower Crane

References

[1] Wang Jia: Research on the overall stability of crane's lattice jib with main and vice-jib structure (Harbin Institute of Technology, Harbin 2006).

[2] Xue Yuan: An efficient method for calculating of tower mast stiffness of tower crane (Harbin Institute of Technology, Harbin 2001).

[3] S. P. Timoshenko and J. M. Gere, in: Theory of elastic stability (2nd edition), Science Press, Beijing (1965).

[4] Li Minzhe, Gu Lichen, Yu Yongfeng and Yang Lina: Research in extra long distance attachment technique for tower cranes. Construction Machinery and Equipment, Vol. 40 (2009), pp.37-41.

[5] YAN Zun-xiang, XU Jun-qi and LI Chang-hua: The calculation about attachment rod's maximum internal force of tower crane. Construction Mechanization, (2012), pp.51-55.

[6] Ahmed K. Noor and Jeanne M. Peters: Instability analysis of space trusses. Computer Methods in Applied Mechanics and Engineering, Vol. 40, (1983), pp.199-218.

DOI: 10.1016/0045-7825(83)90090-7

[7] K. Kondoh and S.N. Atluri: Influence of local buckling on global instability: Simplified, large deformation, post-buckling analyses of plane trusses. Computers & Structures, Vol. 21, (1985), pp.613-627.

DOI: 10.1016/0045-7949(85)90140-3

[8] A. Tyas, M. Gilbert and T. Pritchard: Practical plastic layout optimization of trusses incorporating stability considerations. Computers & Structures, Vol. 84, (2006), pp.115-126.

DOI: 10.1016/j.compstruc.2005.09.032