scara in etabs
TRANSCRIPT
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MODELARE STRUCTURA DE REZISTENTA IN ETABS
PENTRU SCARA CU O RAMPA
Schema geometrica
Schema de incarcare – incarcari normate
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1. Se aleg unitatile de masura (de exemplu kN si m). Se defineste gridul pe cele doua directii
principale. In cazul tratat avem 4 griduri pe longitudinal si 4 griduri pe transversal.
Consideram o scara la o cladire cu 4 niveluri de 2.80 m.
2. Se definesc dimensiunile corecte dintre griduri pe cele doua directii principale.
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3. Se definesc materialele
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4. Se definesc placile de PODEST si de RAMPA.
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5. Se pozitioneaza placile de podeste
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6. Se impart podestele in elemente finite de cca 20-25 cm
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7. Se declara tipurile de rezemari pentru podeste, in functie de continuitatea placilor
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8. Se declara incarcarile permanente (DEAD) si utile (LIVE) pentru placile de podest
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9. Se declara placa de rampa. Mai intai se realizeaza un zoom al zonei respective.
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10. Se imparte placa rampei in elemente finite convenabile, astfel incat sa eziste continuitate cu
elementele finite ale podestelor, in zonele de contact direct.
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11. Se selecteaza placile de podest si rampa declarate si se replicheaza la toate nivelurile
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12. Se modifica rezemarea placii de rampa de la cota inferioara, in incastrare.
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13. Se declara plcacile de rampa cu sectiunea corespunzatoare definita initial
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14. Se declara incarcarile permanente si utile pe rampe.
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15. Din cand in cand modelul se salveaza.
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16. Se selecteaza vederea placilor cu hasura
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17. Se selecteaza, de exemplu, 4 ferestre pentru a putea vedea momentele incovoietoare pe
rampa si podeste.
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18. In fiecare dintre ferestre se selecteaza elementele pe care dorim sa le vedem. De exemplu
rampele in stanga si podestele in dreapta
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19. In ferestrele din stanga se limiteaza vederea modelului numai pe lungimea si latimea rampei
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20. In ferestrele din dreapta se deselecteaza din vedere placile de rampa, pentru a ramene
numai podestele
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21. Se ruleaza aplicatia
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22. Se stabilesc tipurile de eforturi pentru elementele de tip rampa/podeste alese in ferestre
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23. Se declara combinatia de incarcari gravitationala in gruparea fundamentala
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24. Se selecteaza in fiecare fereastra eforturile necesare
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25. Se ajusteaza in mod convenabil limitele stanga dreapta (minime – maxime) pentru aceste
eforturi, in fiecare dintre ferestre.
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26. Se pot selecta prin click dreapta vederi ale momentelor pe cate un element finit, in scopul
determinarii cat mai exacte a eforturilor maxime pentru care se vor realiza armarile
elementelor de rampa/podest
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27. Se verifica sageata in camp a placii de rampa (y<lr/400, in cm)
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Se constata ca sagetile maxime sunt de circa 0.1844 cm adica 1.844 mm. Sageata admisibila fiind de
cca 504/400= 1.26 cm adica 12.6 mm si se observa ca 1.844<<12.6 mm.
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