1. A BRIDGE WITH VEHICLE LOADS
2002년도 대한토목학회 학술발표회 B3, P1-043
VIBRATION CONTROL OF
A BRIDGE WITH VEHICLE LOADS
Jun-Sik Ha1), Ji-Seong Jo2), Sun-Kyu Park3), In-Won Lee4)
1) Graduate Student, Department of Civil and Environmental Engineering, KAIST
2) Ph.D. Candidate, Department of Civil and Environmental Engineering, KAIST
3) Professor, Department of Civil Engineering, SungKyunKwan Univ.
4) Professor, Department of Civil and Environmental Engineering, KAIST

2. INTRODUCTION Propose appropriate passive control device
 Bridges, which have lightweight, are more vulnerable to heavy weight vehicle.
 The vibration induced by vehicle loads makes passengers uncomfortable.
Propose appropriate passive control device
for vibration control of bridges.

3. FORMULATION OF MATHEMATICAL MODEL
 Modeling
Longitudinal
Section
Cross Section
(1)
(2)
Schematics of the bridge
equipped with proposed
passive control device

4. (3) (3) (4) (5) (6)  Multiplying eq.(1) by
 Applying orthogonal condition
(4)
(5)
(6)

5. Optimization of Device Parameters
(7)
(8)
(9)
Optimization of Device Parameters
(10)
When J is minimized, the damping coefficient and spring constant in the control device are optimized.

6. Numerical Example  Composite Steel Plate Girder Bridge
“Generalized of Design for Short Span Steel Bridges Using Rolled Beam”, Magazine of the Korean Society of Steel Construction, vol.14, No.1, pp. 77~82.
 Geometry and Material Properties
 Bridge
 Control Device
Schematics of the bridge

7.  Optimal Damping Coefficient and Spring Constant
 Simulation Results
Displacement of Mid-span
Acceleration of Mid-span
Maximum Responses
of Mid-span
Uncontrolled Case
Controlled Case
Reduction (%)
Displacement(m)
0.224
0.175
22.0
Acceleration(m/s2)
9.90
7.81
21.1

8. Conclusions Proposed passive control device could be
- can reduce both displacement and acceleration
simultaneously.
- can decay the steady-state responses fast.
Proposed passive control device could be
effectively used for vibration control of
bridges under vehicle loads.