Estrut Metálicas Dim Tração e Compressão.pdf

7/23/2019 Estrut Metlicas Dim Trao e Compresso.pdf

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( )

C Eaa C

Na Aa

P. Wa M


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ASSOCIAO B RASILEIRA DE NORMAS TCNICAS (ABNT). NBR 8800:2008. P Ea A Ea Ma A Cc Ec. R Ja.

PFEIL, W. ; PFEIL, M. Ea A: Da Pc Ac c a NBR 8800:2008 8. R Ja: LTC, 2009.

SILVA, V. P. ; FRUCHTENGARTEN, J. Ea Mca Maa Da Ea A. Aa P USP PEF 2402, S Pa, 2009 .


3/29

M:a) M a a

b) M a (Ua a NBR8800/20080

a) M a a (AISC: ASD ab ): caa a aa

c a a:

Caacca a

1. O a ca c acaa a aa;

2. O cc ca c;

3. A caa aa caa c aa;

4. A aa a a ca ba a

a (cc aa).

b) M a (AISC: LRFD aa ac ac )

(1) Caa aa c caa: Ea aca cca caa ca cca a a , , a

a b c c ;

aca a a a ;

a a a ;

aba c ;

a aa.

(2) Da a: Ea a

Da ca (ca) Vba (ca)


4/29

O ca a ca aca aa a a a a caca c a ca a. N a a

aa, c c, c:a) Eca cca ca, a a a a c.

b) Eca ca, ca a a ca,a a caa, b a b ca

ca a caa.Paa a NBR 8800/2008 a a ca a, a aa a aaaca a aca. A Na aa c a, c ca ca ca.

A a aa ca a (a a ), cba a a aa a a a (a a ), c ba a a aa a a.

A a a aa caa a caa .


5/29

S a NBR 8800/2008 a a cacaa :

A Pa (G) a c c a aca ca a a a a a c.

A Va (Q) a c c a aa aa caa aa a a c (bcaa, a, a , ca, ,c).

A Ecca (E) a a a ca baba baa cca a a a a c, a caa aa a (, c c, c, c, , c).

A cba a aa a ca a aba:


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7/29


8/29

Ecc ( aa 45)


9/29

A ca cc aa a c (NBR 8800/2008):

=

O, a ca caacca a cc a a ca.


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11/29

() () () ()

N a, aa a c:, ,

O: , a a aa a ca cc;

, a a aa a cc, c ac.

A ca a a a a aa aa :

a) Eca aa a baa a c, ca a

aaa.

,=

b) Ra a c ;

, =

O: a a ba a aa a baa;

a a a a a aa a baa ( = );

a ca a ca a;

a ca a a;

cc a a ca.

D aa a c b aa a acaa, c a baaa acaa a 300

S c b a L c a baa a a.


12/29

Ca ca a baa c caa a aa a:

O ca a c c a aa a a c a .

Na a c a a c a cca c ca a caa bc a ca.


13/29

O aa c ca aa ca ba. O c a cc a c ca c 1 ,5 a cc. Ea a aca aa a , ca,

cc, c a 1 a .N ca a, a a a a a cc () acc 3,5 , 2 c a a ca 1 ,5 a a a cc.

: Na baa c , a a a(A) ba ba a a ba (A) a a c a a a a.

N ca a aa, c a c ( 1 1 1 , 1 22 1 ) aaca a a, a a a a c. O a caca c c , a a

ca

, ca aa a ca .A a a A, baa c aa a a

= 3,5

aa

a b c

a.


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a aca a a A.

Qa a a a aa a aa caa a aa abaa, a aa C= 1,00

N aba, a a a a aa aa

a a aa aa a ( ) a aa, aa C(NBR8800) :

= 1

,60 a 0,90 c a c

a aba 0,60.

c a cca a a a ( a ac a) a a c

c a a a a a a a: c aa, a aaaa a ca aa a a a.

Paa a c cc, c c a, ca ac cca aa A C ac c a a.

b


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N ca caa a aca a cc, a a a a a ca aa a a a cc a a. N ca, a caa bc, c a cb a a,

caa a aa a (a A) a a a a (a A).

A a a a acaa a acaaa a a ca a a caaa, c a ca. Da a, a ca cacaa c a :

=1

,60

1

0,60

0,60 0,60 ca a a ca a caa a; ca a a a ba caaa;

a a a acaa;

= 1 ,0 a a a a a ;

= 0,5 aa .


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(aa, aa X aa, a a aa /)

1

203 17,1

Da:

A: = 25 N/c2, = 40 N/c2;

Paa = 19 ;

NS= 150 N (= 1,25);

NS= 540 N (= 1,5);

Pfi U 20317,1 (aba fi) A = 21,68 c; = c= 1,47 c = 5,59

D = 1,9 + 0,35 = 2,25 c

= 3,5 = 2 ( 21,68 2 2,25 0,56) = 38,32 c

C= 1 = 1

,

= 0,88 (0,06C0,90) A= 0,88 38,32 = 33,72 c

a) Eca a S Ba

,

=

,

, = 985 N

b) Ra a S La

,

=

,

, = 999 N

c) Cac E Na Sca PN= 1,25 NS+ 1,5 NS= 978 N (OK)


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2 Da a aa a a a a, a caa c aba a(a aa, c C= 0,9, a: = 25 N/c2, = 40 N/c2), ca HS= 0 HS= 95N(= 1,5).

a) Fa a ca

= 95 1,5 = 142,5 N

,=

142,5 = 201,5 N

b) Fa a

Eca a ba:

, , ,=

,

, ,

= 8,87 c

Ra a a a: ( ca= A=A)

, , ,=

,

, ,

, = 7,56 c

c) L :

= 44,3 = 3 ,

= 1,41 c

3000

3000

A

B C

D

Daa

V

C

aP cCaa AbaIa 76,2 7,29


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() () () ()

Pa ca aa caa c a, a aa a a caa c c a aa.

A c a, a ca a a caa ca, c a aca . O ca aa c c cc aba , a, a caaca caa a

a a a ca a a acaa.

A caa c c a a aba ca, aaba caacaa aac ca aa caa, a a a. A cca aba ca a b a caa b/.

Na a cca aba, ca a a c a caacca:

aa ( a);

aa ca ca;

a ca;

a acaa; a aa;

c aba ca .


19/29

() () () ()

()

=

A a a caa a b a baa aaa aca a. Aac ca aa, a ca

ca a c (c a aba). E a aca (E) a a a baa ( ca I c L).

S: =

(a a) =

(c b), b a

cca cca:

=

=

A ca a ca, a c a, a c abca aa a ca a a caa caa. N ca c aba c c a a a c

caa. O c a aa c a a ab aa a aba.


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() () () ()


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() () () ()

Vaa ca a ca ca, c b /

Oba :

a) Ca ba (aa /) caba c c< c c

b) Ca b a,a a a ca a ca a a;

c) Ca ca (a ba /), a a a a caa a ca

aa

a)

b)c)


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() () () ()

Paa a caa a ca c a, a ca a ca a aa aaa c a caa c/, c b 0:

=/

)/

=

O cc c aba. O c b aa ca a:

=

Paa a c b, c a 0:

MR 250 =,3

AR 350 ,33


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() () () ()

C E Faba (K).


24/29

() () () ()

Da aba ca a aba a acac c. N ca a acac ca aa caaa a a a (aba ca). E aca ba ca caa ba, c aba a ca (ba) aba

ca (a caa) c a aa acaa a.

S a aca c a (b/) a a aba aba , a abaca (a a Q=1,00). N ca c, a ca a a

ca cca aba ca, caa a a (Q) c A Fa NBR 8800/2008.


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() () () ()

Va b/ caa c c aa aa aaba ca ca a ca aa.


26/29

() () () ()

Na aba a ca, a aaa a a a ca: a aa ca (I) caa c caa c .

E aa I, H c c ca, a aba

caa cca aba, a, a, ca ca aba .

E aa U, L c ab, a ca aaba ca a ca a b, aa a a a b a aba

a ( ) a.Paca a aba a c caa. Na a ca , a c caa a baa, aaba a a.

D ac c a a NBR 8800 a

a a ca aba, c b (0)b c a caa cca c a aba.


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() () () ()

N a, aa a c:, ,

O: , a a aa c ca cc;

, a a aa c cc, c ac.

A ca a a a c aa aa :

,=

O: a aca ca c;

Q a a aca aba ca (Q=1 a c abaca);

A a a ba a aa a baa.O a aca ca c, , a :

aa ,5 ,65

aa ,5 ,

O: 0 c b a :

Paa a c b, baa aba ,c a 0:

MR 250 ,3

AR 350 ,33


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() () () ()

Paa cac 0

aaa a a aba aba:


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() () () ()

Aba aa 0

O c b a baa ca, a c a a a a a c , a cc aba caa, a 200 ( 200).

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Estrut Metálicas Dim Tração e Compressão.pdf