Analysis of Stiffening Methods and Effects on Irregular Single-layer Lattice Shell Structures
DOI:
https://doi.org/10.5614/j.eng.technol.sci.2018.50.2.1Keywords:
irregular shell, planar truss, single-layer lattice shell, space truss, stiffening.Abstract
Local stiffening is often a good solution to mechanical property problems of irregular single-layer lattice shell structures. The effects of three local stiffening methods, namely section enlargement stiffening, planar truss stiffening, and space truss stiffening, on their structural stiffness, strength, and overall stability were analyzed in this study. A practical engineering example showed that these three stiffening methods could effectively reduce the deformation of the lattice shell under vertical and lateral loads, reduce the comprehensive stress ratio, and increase the buckling eigenvalue and ultimate bearing capacity factor. The local space truss stiffening method had the best comprehensive effect. The same stiffening methods were applied to a regular lattice shell and the analysis showed that the stiffening effect on a regular shell is quite different from that on an irregular lattice shell. The three stiffening methods could not reduce its deformation under vertical loading but could reinforce the strength and overall stability of the structure effectively. Proper suggestions are proposed according to the preceding analysis in case a single-layer lattice shell structure cannot meet the demands of the design code.Downloads
References
Shen, Z.Y. & Chen, Y.J., Grid and Lattice Shell, ed. 1, Tongji University Press, Shanghai, 1997. (in Chinese)
Arwade, S.R., Schafer, D.F. & Schafer, S.T., Modern Examples of Structural Art in Metals, Structures Congress 2015, ASCE, pp. 714-729, 2015.
Yan, R., Chen, Z., Wang, X. Xiao, X. & Yuan, Y., Calculation Theory and Experimental Study of the K6 Single-layer Reticulated Shell, International Journal of Steel Structures, 14(2), pp. 195-12, 2014.
Cao, Z., Du, P., Chen, Z. & Wan, Z., The Stability and Stressed Skin Effect Analyses of an 80 m Diameter Single-layer Latticed Dome with Bolt-ball Joints, International Journal of Steel Structures, 16(2), pp. 279-288, 2016.
He, Y.J., Zhou, X.H. & Liu, D., Research on Stability of Single-layer Inverted Catenary Cylindrical Reticulated Shells, Thin Walled Structures, 82, pp. 233-244, 2014.
Cui, C., Jiang, B. & Wang, Y.J., Node Shift Method for Stiffness-based Optimization of Single-layer Reticulated Shells, Journal of Zhejiang University, 15(2), pp. 97-107, Feb. 2014.
Ruan, R.W., Yang, W. B., Lu, L. & Zeng, G.H., Successfully Application of Stiffened Single-layer Lattice Shell, Proceedings of the National Steel Structure Annual Academic Meeting, Chengdu, pp. 17-19, Oct. 2009. (in Chinese)
Chen, Z.H., Chen, B.B., Yan, X.Y., Liu, H.B. & Yu, J.H., Structural Design and Analysis of an Ellipsoidal Single-layer Reticulated Shell Supported by Spatial Arch Trusses. Building Structure, 44(10), pp. 51-55, May 2014. (in Chinese)
Shen, S.Z., Stability of Lattice Shell Structures, ed. 1, Science Press, Beijing, pp. 205-209, 1999. (in Chinese)
Lode Code for the Design of Building Structures (GB50009-2012), China Building Industry Press, Beijing, 2012. (in Chinese)
Fan, F., Cao, Z., & Shen, S., Elasto-plastic Stability of Single-layer Reticulated Shells, Thin-Walled Structures, 48(10-11), pp. 827-836, 2010.
Technical Specification for Space Frame Structures (JGJ7-2010), China Building Industry Press, Beijing, 2010. (in Chinese)
