投影片 1 - ntut.edu.tw

投影片 1 - ntut.edu.tw

A Study on the Structural Test and Mechanical
Behavior of the GFRP I Beam Superstructure
1

Yeou-Fong Li and Yen-Chun Chen2

1

Professor of the Department of Civil Engineering , NTUT, Taipei, Taiwan .
2
Master of the Department of Civil Engineering, NTUT, Taipei, Taiwan.

Abstract :This study presents Fiber Reinforced Plastic (FRP) composite components used in temporary bridge for
emergency relief. There are some advantages of FRP, including light weight, high strength, weather resistance and easy
storage, making FRP suitable for temporary bridge. There are two types of FRP temporary bridge in this study. First
type is pedestrian bridge. Second type is vehicular bridge. The pedestrian bridge is suspension bridge made by the cable,
FRP deck, FRP bar and FRP frame. Use SAP2000 to establish the numerical model. Load several different types of loads
to simulate the real load and check the safety factor. Finally, make the FRP suspension bridge. The vehicular bridge use
FRP beam-deck system as superstructure. Use SAP2000 to establish the numerical model. Establish the numerical model
of different spans. The type of the load is according to the design of bridge code. Then check the safety factor. Finally,
make the best type of FRP vehicular bridge.
Keywords Fiber Reinforced Plastic, temporary bridge

The Small-Scale Model GFRP bridge superstructure (I girder-deck) system.
Non Transverse
Beam

Transverse Beam

N.A.

W4X2-T4

Non Deck
Deck

Transverse Screw
Beam

Screw

W4X2-PC
W4X2-PA

N.A.

W4X2-P2

W4X2-TP2

Midpoint

One-third point

W4X2-P2C1

W4X2-P2C2

Double Plate

(Supporting pad)

Connection

Pmax (kN)

W4X2-L1
W4X2-T4
W4X2-PC
W4X2-PA
W4X2-TP2
W4X2-P2
W4X2-L1C
W4X2-P2C1
W4X2-P2C2

20.59
111.18
91.17
101.45
118.06
141.94
19.03
107.62
105.74

T: Lateral Torsional Buckling
C: Local crushing at loading area
V: Shear failure at loading area
I: Interface of the beam and deck fail.

Interface of the beam and
deck fail

Bolt

Main
Beam

Supporting
Pad

T4 is 3 Main Beam with 4 pair Transverse Beam fabricate by Bolt
PC is 3 Main Beam with Deck fabricate by Epoxy
PA is 3 Main Beam with Deck fabricate by Epoxy and Screws
P2 is 3 Main Beam with Deck and Supporting pad fabricate by Epoxy and Screws
TP2 is 3 Main Beam with 4 pair Transverse Beam fabricate by Bolt
and with Deck fabricate by Epoxy and Screws also
L1 is 1 Main Beam in prototype
L1 C is 1 Main Beam in prototype connected at Midpoint
P2C1 is 3 Main Beam of P2 system connected at Midpoint
P2C1 is 3 Main Beam of P2 system connected at One-third point interlaced

Conclusions

Test Result
Specimens

Deck

K
(kN/cm)
21.22
55.75
67.30
74.18
79.57
71.9
19.89
67.35
61.21

Failure
mode
TC
VF
SI
S
F
CF
T
B
BW

S: Shear failure at the bearing
F: Weds cracking along fiber
direction
B: Bolts-hole tear
W: Webs cracked in connection area

Weds cracking along the
fiber direction

Webs cracked in connection area Shear failure at loading area

Bolts-hole tear

Shear failure at the bearing

Local crushing at loading
area

The GFRP bridge superstructure (I
girder-deck) system can be to avoid the
prototype beam lateral torsional buckling.
Install deck, transverse beam and
supporting pad appropriately, can avoid
local crushing and shear failure, increase
strength and stiffness.
When the strength is increased, the
strength gradually passed to the webs of
main beam, lead the failure mode
changes to weds cracking along the fiber
direction. This shows the interface
strength of resin and fiber is not enough,
the bolt hole will lead to a destruction
occurred early.
The connection bolts at the midpoint
will slip relatively suddenly than onethird point interlaced
In accordance with the span of the
choice of Euler and Timoshenko beam
theory formula can accurately predict the
stiffness of the GFRP beam members.

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