Êðèòå𳿠ÐÑÇ äëÿ ñòåðæí³â
 ÿêîñò³ êðèòåð³¿â íåáåçïåêè ÐÑÇ äëÿ ñòåðæíåâèõ åëåìåíò³â ïðèéíÿò³ åêñòðåìàëüí³ çíà÷åííÿ íîðìàëüíèõ ³ äîòè÷íèõ íàïðóæåíü, îá÷èñëåí³ â õàðàêòåðíèõ òî÷êàõ ïðèâåäåíîãî ïðÿìîêóòíîãî ïåðåð³çó, à òàêîæ åêñòðåìàëüí³ çíà÷åííÿ çóñèëü ó ïåðåð³ç³.
Äëÿ íîðìàëüíèõ íàïðóæåíü çàñòîñîâóºòüñÿ íàñòóïíà ôîðìóëà:
äå k – òî÷êà ïåðåð³çó ñòåðæíÿ (k = 1...9).
Öÿ ôîðìóëà ïåðåòâîðþºòüñÿ íàñòóïíèì ÷èíîì ïðè
:
äå cyi ³ czi – ÿäðîâ³ â³äñòàí³ ó ïåðåð³ç³ ñòåðæíÿ (i = 1,2). Òàêèé ï³äõ³ä äîçâîëÿº âèçíà÷èòè åêñòðåìàëüí³ íîðìàëüí³ íàïðóæåííÿ â ïåðåð³ç³ áóäü-ÿêî¿ ôîðìè, ïðèâ³âøè ¿¿ äî ïðÿìîêóòíî¿.
Äëÿ äîòè÷íèõ íàïðóæåíü âèêîðèñòîâóºòüñÿ íàáëèæåíà ôîðìóëà:
Íàïðóæåííÿ, îá÷èñëåí³ çà ôîðìóëàìè (2) ³ (3), íàâåäåí³ ó òàáëèö³ 1 äëÿ êîæíî¿ òî÷êè ïåðåð³çó. Ó öüîìó âèêîðèñòîâóºòüñÿ ïðèéíÿòå äëÿ çóñèëü ïðàâèëî çíàê³â.
Òàáë. 1. Íàâåäåí³ ôîðìóëè äëÿ îá÷èñëåííÿ íàïðóæåíü ó òî÷êàõ ïðÿìîêóòíîãî ïåðåð³çó.
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¹ Òî÷êè ïåðåð³çó
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Íîðìàëüí³ íàïðóæåííÿ
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Äîòè÷í³ íàïðóæåííÿ
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1
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-
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2
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-
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3
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-
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4
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-
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5
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6
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7
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8
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Êð³ì íîðìàëüíèõ ³ äîòè÷íèõ íàïðóæåíü îá÷èñëþþòüñÿ åêñòðåìàëüí³ çíà÷åííÿ ïîçäîâæíüî¿ òà êîæíî¿ ç ïåðåð³çóþ÷èõ ñèë, ãîðèçîíòàëüíî¿ ³ âåðòèêàëüíî¿ ðåàêö³é ïðóæíî¿ îñíîâè, à òàêîæ åêñòðåìàëüí³ çíà÷åííÿ çãèíàëüíèõ ìîìåíò³â.
Óñüîãî äëÿ ïåðåð³çó ñòåðæíÿ âèáèðàºòüñÿ 46 çíà÷åíü ÐÑÇ.
Íóìåðàö³ÿ êðèòåð³¿â ðîçðàõóíêîâèõ ñïîëó÷åíü çóñèëü (ÐÑÇ) äëÿ ñòåðæí³â òà â³äïîâ³äí³ ¿ì íàïðóãæåííÿ òà çóñèëëÿ íàâåäåí³ ó òàáëèö³ 2.
Òàáë. 2. Êðèòå𳿠ÐÑÇ äëÿ ñòåðæí³â
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¹¹ Êðèòåð³¿â
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1
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2
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3
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4
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5
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6
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7
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8
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9
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10
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11
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12
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Çíà÷åííÿ
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σ1+
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σ1-
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σ2+
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σ2-
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σ3+
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σ3-
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σ4+
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σ4-
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𝜏7+
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𝜏7-
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𝜏8+
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𝜏8-
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¹¹ Êðèòåð³¿â
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13
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14
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15
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16
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17
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18
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19
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20
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21
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22
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23
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24
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Çíà÷åííÿ
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𝜏5+
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𝜏5-
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𝜏6+
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𝜏6-
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N+
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N-
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σ7+
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σ7-
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σ8+
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σ8-
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σ5+
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σ5-
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¹¹ Êðèòåð³¿â
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25
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26
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27
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28
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29
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30
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31
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32
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33
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34
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35
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36
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Çíà÷åííÿ
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σ6+
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σ6-
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Qy+, N+
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Qy-, N+
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Qy+, N-
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Qy-, N-
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Qz+, N+
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Qz-, N+
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Qz+, N-
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Qz-, N+-
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Ry+
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Ry-
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¹¹ Êðèòåð³¿â
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37
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38
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39
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40
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41
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42
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43
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44
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45
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46
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-
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-
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Çíà÷åííÿ
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Rz+
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Rz-
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My+
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My-
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Qz+
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Qz-
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Mz+
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My-
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Qy+
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Qy-
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-
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-
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Êðèòå𳿠ÐÑÇ äëÿ ïëàñòèí
Äëÿ åëåìåíò³â ïëîñêîãî íàïðóæåíîãî ñòàíó, ïëèò ³ îáîëîíîê ÿê êðèòåð³é ïðèéíÿò³ íàïðóæåííÿ, ùî âèçíà÷àþòüñÿ íà ï³äñòàâ³ ìåòîäó Âóäà-Àðìåðà çà òàêèìè ôîðìóëàìè:
Íóìåðàö³ÿ êðèòåð³¿â ðîçðàõóíêîâèõ ñïîëó÷åíü çóñèëü (ÐÑÇ) äëÿ ïëàñòèí òà â³äïîâ³äí³ ¿ì íàïðóæåííÿ íàâåäåí³ â òàáëèö³ 3.
Òàáë. 3. Êðèòå𳿠ÐÑÇ äëÿ ïëàñòèí
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¹¹ Êðèòåð³¿â
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1
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2
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3
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4
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5
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6
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7
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8
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9
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Çíà÷åííÿ
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σ1+
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σ1-
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σ2+
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σ2-
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σ3+
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σ3-
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σ4+
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σ4-
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Nx*+
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¹¹ Êðèòåð³¿â
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10
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11
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12
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13
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14
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15
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16
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17
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-
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Çíà÷åííÿ
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Nx*-
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Ny*+
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Ny*-
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Qx+
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Qx-
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Qy+
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Qy-
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√(Qx2+Qy2)
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-
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Êðèòå𳿠ÐÑÇ äëÿ îá'ºìíèõ ÊÅ
Êðèòåð³ºì äëÿ âèçíà÷åííÿ ðîçðàõóíêîâèõ ñïîëó÷åíü çóñèëü (ÐÑÇ) äëÿ îá'ºìíèõ ÊÅ ïðèéíÿò³ åêñòðåìàëüí³ çíà÷åííÿ íàïðóæåíü. Íóìåðàö³ÿ êðèòåð³¿â òà â³äïîâ³äí³ ¿ì íàïðóæåííÿ íàâåäåí³ ó òàáëèö³ 4.
Òàáë. 4. Êðèòå𳿠ÐÑÇ äëÿ îá'ºìíèõ ÊÅ
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¹¹ Êðèòåð³¿â
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1
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2
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3
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4
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5
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6
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7
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8
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9
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10
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11
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12
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Çíà÷åííÿ
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Nx+
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Nx-
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Ny+
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Ny-
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Nz+
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Nz-
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Txy+
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Txy-
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Txz+
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Txz-
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Tyz+
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Tyz-
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Êðèòå𳿠ÐÑÇ äëÿ ñïåö³àëüíèõ ÊÅ
Êðèòåð³ºì äëÿ âèçíà÷åííÿ íåáåçïå÷íèõ ñïîëó÷åíü ó ñïåö³àëüíèõ (îäíîâóçëîâèõ ÊÅ 51, 56 òà äâîâóçëîâîìó ÊÅ 55) åëåìåíòàõ ïðèéíÿòî åêñòðåìàëüí³ çíà÷åííÿ çóñèëü.
Äëÿ ÊÅ 51, 55 ³ 56 ïðèéíÿòî íóìåðàö³þ êðèòåð³¿â â³ä 1 äî 12, ùî â³äïîâ³äຠ³íäåêñàö³¿ çóñèëü ó öüîìó ÊÅ.
Äëÿ çàêîíòóðíèõ åëåìåíò³â ´ðóíòó (ÊÅ 53, 54) ÐÑÇ íå îá÷èñëþþòüñÿ.