γ

:=

C

1.4

f

:=

−

pk

1770MPa

3

γ :=

:=

:=

⋅

S

1.15

fck

70MPa

εcu

2.8 10

PN str 24

EC str 1 NA.2

EC str 26

EC str 26

A

⋅

+ A ⋅

− A ⋅

I.

pprov f

pprov pd

s1 fyd

s2 fyd

A

:=

=

c.eff

η⋅fcd

− 6 2

− 3 2

A

:=

⋅

⋅

⋅

=

×

pprov

12 150 10

m

1.8

10

m

fp01k

PN - str 24

f

:=

⋅

:=

p01k

0.9 fpk

f

=

pd

f

γ

pd

1385.217 MPa S

EC str 1 NA.2

f

−

ck

50MPa

η := 1 −

= 0.9

EC str 32

200MPa

fck

f

:=

=

EC str 30

cd

50 MPa

γC

− 3 2

1.8⋅10

m ⋅1385.217 MPa 2

A

:=

=

c.eff

0.055 m

0.9⋅50MPa II.

Ac.eff

b :=

:=

=

f

0.8m

xeff

0.069 m

bf

- szerokość strefy ściskanej x

d :=

−

=

eff

p

0.8m

0.1m

0.7 m

III.

ξ

:=

=

eff

0.099

dp

- od krawędzi ściskanej do środka ciężkości A.p

0.8εcu EC str 26

IV.

ξ

:=

eff.lim

ε

−

cu

∆εp

f

− pd ⎛

σpmt⎞

∆ε :=

⋅⎜ −

⋅

p

1

0.9

Ep

f

p ⎝

pd ⎠

σ

:= ε

⋅

pmt

εpm E

pm p

P

3

mt

P

0.7⋅2400⋅10 N

− 3

ε

:=

=

×

pm

4.786

10

E ⋅

−

p Approv

9

3 2

195⋅10 Pa⋅1.8⋅10

m

− 3

3

σ

:=

×

⋅

⋅

=

pmt

4.786

10

195 10 MPa 933.27 MPa 1385.22

−

MPa ⎛

0.9⋅933.27 MPa ⎞

− 3

∆ε :=

⎜ −

=

×

p

1

3

⎝

1385.22MPa ⎠

2.796

−

10

195⋅10 MPa 0.8εcu

ξ

:=

=

eff.lim

0.4

ε

−

cu

∆εp

V.

ξ

<

eff

ξeff.lim

VI.

M

:=

⋅ ⋅

⋅( −

) =

⋅

Rd

Ac.eff η fcd dp 0.5xeff 1659.026 kN m f.cd w kPa VII.

M

:=

⋅

Sd

3500kN m

M

>

=

Rd

MSd 0

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