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61-ɫɭɪɟɬ

Ԛɲɛԝɪɵɲɬɚɪɞɵԙ ԝԕɫɚɫɬɵԑɵɧɚɧ bɭ ɲɚɦɚɫɵɧ ɬɚɛɚɦɵɡ.

by h y1 .
h

ɂɧɬɟɝɪɚɥԑɚ ԕɨɹɦɵɡ, ɫɨɧɞɚ:

³S x1b h h y1 ˜ y1 ˜ dy .
h 0

ɂɧɬɟɝɪɚɥɞɵ ɚɥԑɚɧɧɚɧ ɤɟɣiɧ:

S x1 b ˜ h2 .
6

ȿɧɞi ɯ ɨɫiɧɞɟɝi ɫɬɚɬɢɤɚɥɵԕ ɦɨɦɟɧɬɬi (Sx2) ɬɚɛɚɣɵԕ, ɨɥ ԛɲiɧ (5.4)
ɮɨɪɦɭɥɚɥɚɪɞɵ ԕɨɥɞɚɧɚɦɵɡ.

S x2 S x1 c ˜ A , (c h , A 1 b ˜ h)
5 2

Sx2 b ˜ h2 h ˜ 1 bh bh2 .
6 5 2 15

ɋɨɧɵɦɟɧ, ԛɲɛԝɪɵɲɬɵԙ, ԧɡiɧiԙ ɬɚɛɚɧɵɧɚ ɩɚɪɚɥɥɟɥɶ, ɨɞɚɧ h

5

ɲɚɦɚɫɵɧɞɚԑɵ ԕɚɲɵԕɬɵԕɬɚ ɨɪɧɚɥɚɫԕɚɧ ɨɫɶɬɟɝi ɫɬɚɬɢɤɚɥɵԕ ɦɨɦɟɧɬi

Sx2 b ˜ h2 ɲɚɦɚɫɵɧɚ ɬɟԙ.
15

§2. Ɉɪɬɚɥɵԕ ɨɫɶɬɟɪ. Ԕɢɦɚɧɵԙ ɫɚɥɦɚԕ ɰɟɧɬɪɿ
ɋɬɚɬɢɤɚɥɵԕ ɦɨɦɟɧɬi ɧԧɥɝɟ ɬɟԙ ɨɫɶɬɟɪ ɨɪɬɚɥɵԕ ɨɫɶɬɟɪ ɞɟɩ ɚɬɚɥɚɞɵ. Ԧɡɚɪɚ
ɩɚɪɚɥɥɟɥɶ ɨɫɶɬɟɪɞiԙ ɬɟɤ ɛipeyi ԑɚɧɚ ɨɪɬɚɥɵԕ ɛɨɥɚɞɵ.
Ԕɢɦɚɧɵԙ ɨɪɬɚɥɵԕ ɨɫɶɬɟɪiɧ ɬɚɛɭ ԛɲiɧ ԧɬɤɟɧ, ɩɚɪɚɝɪɚɮɬɚԑɵ ɬԧɪɬiɧɲi
ɮɨɪɦɭɥɚɥɚɪɞɵ ԕɨɥɞɚɧɭԑɚ ɛɨɥɚɞɵ. Ɉɥ ԛɲiɧ, ɯ2 , ɭ2 ɨɪɬɚɥɵԕ ɨɫɶɬɟɪ ɛɨɥɫɵɧ ɞɚ,
ɯ1 ɠԥɧɟ ɭ1 ɤɟɡ ɤɟɥɝɟɧ ɨɫɶɬɟɪ ɛɨɥɫɵɧ. Ɉɪɬɚɥɵԕ ɨɫɶɬɟɪɞiԙ ɚɧɵԕɬɚɦɚɫɵ
ɛɨɣɵɧɲɚ:

Sy2 0. (5.5)

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