Issue 61

A.Y. Rahmani et alii, Frattura ed Integrità Strutturale, 61 (2022) 394-409; DOI: 10.3221/IGF-ESIS.61.26

Parameter

Description

Expression

2 2 8 E τ (d-x) A z       s by s

1 C =

1 C

Constant related with mechanism A

Constant related with mechanism B

2 p R C =0.5 (L +S ) 

2 C



 1/ r

Curvature of the beam section

EC 2 [30]

Diameter of longitudinal bending reinforcement of the beam

_



Elasticity modulus of the steel

_

s E

Bond stress in the elastic range

by τ

by τ = f

c

_

Concrete compressive strength

c f

Effective depth of the beam

d

d=h-c

_

Depth of the beam

h

Concrete cover

EC 2 [30]

c

_

Neutral axes depth (cracked section)

x

_

Area of longitudinal bending reinforcement of the beam

s A

Lever arm between the tension and compression forces in the beam section

z

z=d- x 3

Connection region length

p L d 

p L

1 2 4 eff k k k S =k c+ ρ     R 3



R S

Crack spacing

1 k 2 k 3 k 4 k

1 k =0.8 ( high-bond bars )

Constant

0.5

Constant

3.4

Constant

0.425

Constant

A

s

eff ρ =

eff ρ

Reinforcement percentage ratio

A

c,eff

Effective tension aria of concrete

EC 2 [30]

c,eff A

Table 1: Parameters of the moment-rotation relationship developed by Alva and El Debs [10,12].

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