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On-line Journal of the IASS

Vol. 57 (2016) No. 3 September n. 189


Reliability Analysis of Buckling of Reticulated Single Layer Roofs of General Form Under Vertical Loads

< Table of Contents for Vol. 57 (2016) No. 3 September n. 189
  • Journal Name: Journal of the International Association for Shell and Spatial Structures (J. IASS)
  • ISSN: (Electronic Version) 1996-9015
  • ISSN: (Print Version) 1028-365X
  • Issue: Vol. 57 (2016) No. 3 September n. 189
  • Pages: 227-243
  • Title: Reliability Analysis of Buckling of Reticulated Single Layer Roofs of General Form Under Vertical Loads
  • Author(s): S. Kato and T. Yanagisawa
  • DOI Name: http://dx.doi.org/10.20898/j.iass.2016.189.803
  • Keywords: buckling strength, reticulated domes, failure probability, reliability index, free form, perturbation-like, single layer, snow load, global load factor, rigid connection
Abstract
This paper discusses a new formulation to evaluate reliability of buckling load required in design of metal reticulated shells particularly of general forms under dead and snow loads. Buckling load is analyzed as elasto-plastic buckling load. Several roofs of different geometries with a span around 50 meters are first analyzed to formulate buckling load for general form based on both elastic buckling load and plastic strength, and its validity is proven. Second, for reliability analysis, elastic buckling load and plastic strength are formulated based on a perturbation-like method. Third, the proposed formulation is applied to evaluate the reliability index of free form reticulated shells under dead and snow loads. For the reliability index, not only external loads but also Young’s modulus, yield strength of material, sectional area of members, knockdown factor for elastic buckling load, and several related structural factors are treated probabilistic parameters. The global load factor is also evaluated in terms of reliability index using 100-year reference period for safety evaluation and 100-year return period. Finally, conclusions are drawn for future development of the present scheme for reticulated shells of free form.

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