The major problem in serviceability degradation of steel truss bridge is interaction of moving vehicle
load with the bridge 's upper structure. One of the improvement efforts is to strengthen the bridge system
by using eternal pretension tendon. Pretension tendons with polygonal, kingpost and horizontal
configuration are designed as an active control equipped with the actuator. Based on adaptive control
technique, fuzzy logic algorithm was used to activate the tendon control in the bridge as a Fuzzy Logic
Control feedback ( FLC feedback) system, where the change of control force can be set to be
proportionalbr adaptable to the displacement. From the simulation with various cable configurations,
with various velocities of continuous and discontinuous vehicle models, and various types of tendons, it
shows that the Kingpost tendon configuration has a better performance to reduce the displacement of the
bridge 's upper structure and to minimize tensile stresses at bottom chord element.
