Seismic Mitigation of Curved Continuous Girder Bridge Considering Collision Effect

Abstract

Due to structural irregularity, curved bridgesaremore likely to cause non-uniform collisions and unseating between adjacent components when subjected to earthquakes. Based on the analysis of the collision response of curved bridges duringearthquakes, and according to the seismic characteristics of curved bridges, research was carried out on pounding mitigation and unseating prevention measures. A curved bridge with double column piers was taken as an engineering example, and a finite element model of curved bridges thatcould consider the non-uniform contact collision between adjacent components was built with ABAQUS software. Viscoelastic dampers, viscous dampers, and a lead rubber bearing were selected as the damping devices, and a steel wire rope-rubber mat was used as the pounding mitigation device to form the combinatorial seismic mitigation system. Based on the principle of energy dissipation combined with constraints, three kinds of combined seismic mitigation case were determined; a seismic response analysis was then performed. The results indicated that the three kinds of combined seismic case were effective atreducing the response topounding force, stress, damage, girder torsion and displacement, and achieved the goals of seismic mitigation and unseating prevention.

Impact of Variable Parameters of Expansion Joints and Bearing Supports on the Vehicle-Induced Vibration of Curved Girder Bridges

“…By combining Equation (1) with Equation ( 2), the roll angle of the vehicle body can be determined as shown in Equation (3).…”

“…In this case, centrifugal forces result from the outward centrifugal acceleration of vehicles, which have potential effects on the stability and structure of the bridge. Therefore, the centrifugal forces of vehicles become critical factors in bridge design, including the design of static and dynamic bearing capacities [3,4]. Conceivably, the introduction of the centrifugal force makes the problem of the vehicle-induced dynamic response of curved girder bridges more complicated.…”

Special Issue Editorial “Symmetry in Structural Health Monitoring”

“…Li et al's [4] study on the curved unsymmetrical bridge model with non-uniform contact collision between adjacent components for seismic mitigation and unseating prevention, the damping devices and the pounding mitigation device can be used as a combinatorial seismic mitigation system to form three kinds of combined seismic mitigation cases. The results indicated that it is effective at reducing the response to a pounding force, stress, damage, girder torsion and displacement, and achieved the goals of seismic mitigation and unseating prevention.…”