PSI - Issue 62
Andrea Maffei et al. / Procedia Structural Integrity 62 (2024) 1006–1013 Author name / Structural Integrity Procedia 00 (2019) 000 – 000
1010
5
Table 1. Material.
Concrete reinforcement
Description
Steel bars
GFRP bars
Concrete class
C40/50
Barrier
Steel Grade S235 3xM24 Class 8.8 Rk,ucr = 15 MPa
Fasteners
Characteristic bond resistance (uncracked)
Longitudinal bars
16 f fk 800 MPa 14/150 f fk 800 MPa
16 B450C 12/150 B450C
Stirrups
Table 2. Rebar comparison.
Concrete reinforcement
Steel bars
GFRP bars
Modulus of elasticity E
210000 MPa Modulus of elasticity E
40000 MPa 8.0 MPa
Bond strength of supplementary reinforcement f bk Partial factor (accidental design situation) c Bond strength of supplementary reinforcement f bd
5.53
MPa Bond strength of supplementary reinforcement f bk
1.2
-
1.2
-
Partial factor (accidental design situation) c
4.61 450
MPa Bond strength of supplementary reinforcement f bd
6.67 MPa 800 MPa
MPa Characteristic tensile strength f fk
Characteristic yielding strength f yk
1.0
- - -
1.0 0.7 2.0
- - -
Partial factor (accidental design situation) s Conversion factor (environmental + long term)
Partial factor (accidental design situation) s Conversion factor (environmental + long term)
- -
Material partial factor
Bending effect partial factor f,
450
MPa Design value f fd
280 MPa
Design value f yd
3.2. Design criteria and verifications outcomes The design of the curb reinforcement is realized by considering the impact load of a vehicle in the event of a collision, according to the Italian construction code (NTC18). The impact load is computed considering the yield of the barrier post as shown in Table 3.
Table 3. Impact load.
Impact load
Characteristic yielding strength of the post
235
MPa
Plastic section modulus Plastic bending moment Amplification factor
144.7
cm 3
34.0
kNm
1.5
-
Design plastic bending moment Height from the road surface
51.0 1.00 66.2 62.9
kNm
m
Force at the base plate Moment at the base plate
kN
kNm
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