SkyCivソフトウェアのガイド - チュートリアル, ハウツーガイドと技術記事


  1. ホーム
  2. SkyCivセクションビルダー
  3. 結果
  4. 複合結果


As mentioned in the section about Standard Results, the main purpose of the Section Builder is to calculate the various section properties of your section. The Composite/Transformed Results refer to section property results which have been adjusted due to differences in material properties making up the section. The adjustment is based on the Transformed-Section Method. Whilst it does not theoretically matter which shape(s) is transformed, the Section Builder will by default transform all shapes into the material with the highest Young’s Modulus.

An important concept to understand is that the section properties are all geometric. That is to say that to calculate them, you do not need to consider any material properties and are hence independent of them.

However one important difference that introducing different materials causes is the movement of the neutral axis from the centroid. Whereas the centroid is purely geometric, the neutral axis is not. When a section is of a uniform material, the neutral axis passes through the centroid. This is not the case with a section comprising different materials. Due to this important difference, the moment of inertia values (for bending) and static moment of area values (for shear) need to be adjusted in order to be used by the flexure and shear formulas respectively.

The secondary purpose of the Section Builder is to feed results into SkyCiv Beam and SkyCiv S3D so that results for deflection and stress can be determined. 複合セクションあり, 変換された慣性モーメント値と静的面積モーメント値が送信されます. ただし、ねじり値は調整されていません, and the original/standard torsion values are sent across. 結果として, 複合材セクションを持つ部材のねじり結果は正確ではない可能性があることに注意してください。.

例: Compare Standard and Composite Results

The results here continue from the section built in the Composite Sections section. As a refresher, the channel is made from concrete, and the I-beam is made of structural steel. After ‘Calculatehas been clicked, the results will display to the right. Notice that there are two tabs for results; ‘Originaland ‘Transformed’.

The results within the ‘Transformedtab will give you the Composite Results. Note that the channel, which was made of concrete, has been transformed into structural steel because structural steel has a higher Young’s modulus.comp results 1

Clicking the ‘Originaltab will give you the Standard Results which ignore material differences. This assumes that the neutral axis intersects the centroid. If you compare the results, you will notice that the neutral axis location differs from the centroid. Properties for torsion are not calculated for the transformed section.

comp results 2

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