HPシェルの基本単位形に関する実験的研究

DOI Web Site Web Site

書誌事項

タイトル別名
  • 4) EXPERIMENTAL STUDY ON ELEMENTAL UNIT FORM OF HYPERBOLIC PARABOLOIDICAL SHELL
  • H.Pシェル ノ キホン タンイケイ ニ カンスル ジッケンテキ ケンキュウ

この論文をさがす

抄録

This report concerns the behaviors of Hyperbolic Paraboloidical shells researched, mainly experimentally. To begin the research from a starting point, elemtal unit forms of H.P. shells (one quadrant of a complete, H.P. surface) supported rigidly on walls were considered. Usually, practical H.P. shell forms are consisted of the combinations of the unit forms and each shell of various types show very different structural behaviours and has more complicated characteristics than that of a unit form. Experiment was undertaken with the intention of checking the reliability of the conventional theoretical analyses, poth membrane and bending, and of researching the destruction processes of H.P. shells under vertical uniform load. Four models made of reinforced mortar which have the same plan (1m×1m), the same thickness (1.1cm) and different rises (0, 30cm, 60cm and 90cm) were used. The boundaries were connected to the tops of verticaly rigid walls (2cm thick). S.R. 4 wire staain gages were used for the measurement of stresses and dial gages were used for the measurement of vertical deflections of shell surface. The results of the experiment are summarized as follows: (a) Bending moment becomes more conspicuous as shell rises become smaller and membrane stress state, can not be expected. In this cace, the stress state becomes similar to that of plate. The whole surface of Soell (II) (rise: 30cm) is under the influence of bending moment and the stress states of Shell (III) (rise: 60cm) and Shell (IV) (rise: 90cm) were almost membrane one. These tendencies of strss distributions can be seen from the results of deflection measurements too. (b) In the destruction processes for each shell, the first cracks occured along the boundaries by the effect of bending moment and next cracks appeared just inside the first one in the parallel directions. (c) The ultimate strength of H.P. shell is rather low compared to that of usual shells such as cylindrical and rotational. This is because of the fact that the change of the Shell shape is rather largeand the surface is easy to be deformed to flat or concave form around the middle part of it.

収録刊行物

詳細情報 詳細情報について

問題の指摘

ページトップへ