Universitatea Tehnic Gh
PAGE 2
UNIVERSITATEA TEHNICA GHEOGHE ASACHI IASI
FACULTATEA DE CONSTRUCTII SI INSTALATIISECTIA C.C.I.A
Student: ARTENI CONSTANTIN
Grupa: 34032006 2007Platform cu strucrur metalic
Tema prioectului:
S se ntocmeasc proiectul de execuie pentru o platform de lucru i
depozitare situat ntr-o cldire industrial.
Structura de rezisten va fi alctuit dintr-o reea de griunzi
principale i secundare peste care reazem tabl groas striat.
Grinzile principale reazem pe stlpi metalici.
Dimensiunile n plan ale platformei sunt:
L, l sunt dimensiunile grinzii principale, respectiv
secundare.
Grinzile secundare se distribuie dae lungul grinzilor principale
la distana a = 1.25m
Cota superioar a platformei va fi de H = 4.5 m.
ncrcare util pe platform provenind din utilaje, materiale i
produse depozitate este:
Grinzile secundare vor fi proiectate din profile dublu T
laminate la cald ( INP sau IPE )
Tabla groas striat va di de grosime g = 5 mm ( TGS 5 ) de tip II
conform STAS 3480 80.
Grinzile principale vor avea seciunea dublu T compus cu mbinri
sudate.
Stalpul platformei ncastrat n fundaie se va proiecta n seciune
compus din profile U laminate la cald ( UNP ) solidarizate co
plcue.
Materialul folosit pentru elementele platformei: OL 37 conform
STAS 500/2 80 ( S 235 conform SREN 10025 + A1/94).
Etapizarea proiectului:
1. a) Scema constructiv a platformei la scara 1:100;b) Calculul
tablei groase striate i a grinzii secundare avnd seciunea din
europrofile dublu T laminate la cald;
2. Calculul grinzii secundare n varianta de grind cu goluri
hexagonale n inim;
3. Dimensionarea grinzii principale, verificarea de
rezisten;
4. a) Variaia seciunii n lungul grinzii (variaia grosimii
tlpilor);
b) Verificarea tensiunilor echivalente;
5. Verificarea rigiditii grinzii principale printr-o metod
exact;
6. a) Verificarea stabilitii generale a grinzii principale;
b) Rigidizrile inimii;
7. a) Verificarea rigidizrii de reazem;
b) Verificarea stabilitii locale (voalare) a inimii i tlpii
comprimate;
8. ndirea de montaj cu eclise i uruburi de nalt rezisten
pretensionate a grinzii principale;
9. a) Rezemerea grinzii secundare pe grinda principal;
b) Plana grinzii principale la scara 1:10;
10. Dimensionarea stlpului i verificarea seciunii;
11. Calculul elementelor de solidarizare i prinderea lor de
ramurele stlpului;
12. Capitelul i baza stlpului;
13. Plana stlpului la scara 1:10, detalii, la scara 1:5.
1
1.a Schema constructiv a platformei la scara 1:100
1.b.1 Calculul tablei groase striate
Calculul ncrcarii:
Verificarea rezistenei
Verificarea rigiditii:
1.2.2 Calculul grinzii secundare
Calculul grinzii secundare se face n dou variante:
a) Varianta de grind secundar cu seciune plin;
b) Varianta de grind secundar cu goluri hexagonale;
a) Varianta de grind secundar cu seciune plin:
ncrcari:
Eforturi:
Dimensionarea grinzii secundare:
Verificarea seciunii adoptate:
Recalcularea ncrcrilor i eforturilor:
Verificarea rezistenei:
-
-
-
Verificarea rigiditii:
b) Varianta de grind secundar cu goluri hexagonale pe inim:
Schema static i ncrcrile sunt aceleai ca i la varianta de grind
secundar cu seciune plin. Ca urmare i eforturile care apar n grind
sunt aceleai:
Dimensionarea grinzii secundare:
Dimensionarea seciunii se face din condiia urmtoare:
Se adopt . Verificarea seciunii adoptate:
Recalcularea ncrcrilor i eforturilor:
Verificarea rezistenei:
a) la ncovoiere:
b) la forfecare:
c) n sudur
Verificarea rigiditii:
coeficient care ine seama de deschiderea grinzii, = 1.15
Seciune grind secundar:
a) Seciune plin:
b) Seciune cu goluri hexagonale:
3. Calculul ginzii principale:
ncrcri:
Eforturi:
Eforturi:
Dimensionarea seciunii:
Verificarea seciunii ad optate:
-
-
-
4. Calculul ginzii principale n varianta seciune variabil
(variaia grosimii tlpilor): Variaia seciunii n lungul grinzii
(variaia grosimii tlpilor);
Pentru evaluarea zonelor de variaie a seciunii se folosete
metoda momentului capabil
Calculul mbinrii sudate de uzin a tlpilor:
Verificarea tensiunilor echivalente:
5. Verificarea rigiditii ginzii principale printr-o metod exact
(Metoda integrrii ecuaiei dformatei):
Nu este verificat condiia de rigiditate ceea ce conduce la
diminuarea lui
Admitem
6. Verificarea stabilitii ginzii principale:
Verificarea stabilitii generale a grinzii principale
Dac , atunci stabilitatea general a grinzii principale este
asigurat i nu se mai face verificare de stabilitate.
stabilitatea general este asigurat.
- coeficient de siguran la instabilitate
- nu se verific
Rigidizrile inimii:Rigidizrile inimii sunt de doua tipuri:
rigidizri curente;
rigidizri de reazem;
Rigidizri curente:
Rigidizri de reazem:
7.a. Verificarea rigidizrii de reazem:
Verificarea la flambaj
Verificarea la strivire
Verificarea sudurilor
7.b. Verificarea satbilitii locale a inimii si a tlpii
comprimate Verificarea stabilitii locale a inimii
Trebuie verificat stabilitatea inimii
Dac
Dac
Verificarea stabilitii tlpii comprimate:
Stabilitatea tltii comprimate este asigurat.8. nndirea de montaj
cu eclise i uruburi de nalt rezisten pretensionate a grinzii
principale:
i. nndirea inimii
Calculul ecliselor:
Verificarea ecliselor:
Verificarea uruburilor
ii. nndirea tlpii
Calculul ecliselor:
Calculul mbinrii:
9.a. Rezemarea grinzii secundare pe grinda principal
Aciuni:
9.b. Plana grinzii principale
10. Dimensionarea stlpului i verificarea seciunii:
Lungimea de flambaj
Calculul ncrcarii:
Eforturi:
Ipoteza 1:
Ipoteza 2:
Dimensionarea seciunii stlpului:
=>
alegem
Distana dintre profile se determin cu condiia
Dimensiunile geometrice ale plcuelor se stabilesc astfel ncat sa
fie ndeplinita condiia:
Verificarea seciunii stlpului:
a) Verificarea la compresiune axial
Distanaele ntre plcutlt de solidarizare:
b) Verificarea la compresiune cu ncavoiere:
EMBED Equation.3
- efortul unitar dat de forta de compresiune a stalpului;
- efortul unitar critic, corespunzator axei z-z , in jurul
careia se produce incovoierea;
c)Verificarea ramurii mai comprimate:
11. Calculul elementelor de solidarizare i prinderea lor de
ramurele stlpului:
Fora tietoare convenionala:
Eforturile sectionale in placute:
Dimensionarea plcuelor:
Verificarea plcuelor:
Calculul cordoanelor de sudur pentru prinderea plcuelor de
ramurile stlpului:
EMBED Equation.3
Deoarece nu se verific rezistena n sudur, se vor lungi
cordoanele de sudur i pe prile laterale a plcuei:
12. Capitelul i baza stlpuluiA. Capitelul stlpului:
se frezeaz marginile diafragmelor.
Dimensiunile diafragmei 1 :
Dimensiunile diafragmei 2 :
Dimensiunile plcii 1:
Verificarea diafragmei d1 la forfecare:
Verificarea diafragmei d1 la ncovoiere:
B. Baza stlpului:
Verificarea presiunilor efective pe beton:
Determinarea grosimii plcii de baz:
Placa 1
calculul se face pe direcia scurt
Placa 3
Placa 4
Calculul traverselor:
Calculul sudurii:
Ancorarea stlpului n fundaie:
Deoarece sub placa de baz exist numai eforturi de compresiune,
stlpul se va ancora n fundaie constructiv cu uruburi de ancoraj .
Lungimea de ancoraj necesar este . Lungimea tijei urubului,
inclusiv ciovul, este de 900mm. EMBED AutoCAD.Drawing.16
EMBED AutoCAD.Drawing.16
EMBED AutoCAD.Drawing.16
EMBED AutoCAD.Drawing.16
EMBED AutoCAD.Drawing.16
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