An analysis method of vehicle–bridge coupling vibration considering effects of expansion joint parameters and its application

Abstract

Parameters' change of expansion joints has significant impact on the vehicleinduced dynamic response of bridges. However, it is uneconomical to conduct health monitoring to evaluate the technical condition of expansion joint. To indirectly evaluate the service performance of expansion joint and clarify the impacts from variations of the expansion joint parameters on the vehiclebridge coupling vibration response, an analysis method of vehicle-expansion joint-bridge coupling vibration (VBCV-J) was established and verified. Then, taking a long-span concrete filled steel tubular arch bridge as the prototype, the vehicle-bridge coupling vibration response were studied using the VBCV-J model while considering the cases of design parameters and variation parameters of the expansion joint. The results show that, for the design parameters, the dynamic amplification factor (DAF) of the expansion joint and the beamend measuring points of the main girder are significant. The DAFs of the short suspenders near the expansion joint is also greater than that of suspenders in the 1/4 span and 1/2 span. For the variable parameters, the variation in the height difference between the middle transverse girder and the side transverse girder will lead to a significant increase in the vehicle-induced impact on the end of the main girder, the short suspender, and in the reaction force of the supports. The decrease of the support stiffness will also make the DAFs of the above components exceed the design value. The variation of the vehicleinduced dynamic response of main beam-end and suspenders can indirectly reflect the service performance of expansion joint. K E Y W O R D S disease impact, dynamic amplification factor, expansion joint, indirect health monitoring, vehicle-bridge coupling vibration Jianling Hou and Weibing Xu contribute equally to the article.

Modeling and Vibration Analysis of Tire-curved Bridge Coupling System

“…Bridge can be seen in Figure 2, spanning across the maximum bending moment and showing a slow increase with the increase in speed. The maximum dynamic bending moment does not occur just after each span across the tire, but rather before and after the tire crosses the bridge [6]. The edge also experiences a different maximum dynamic bending moment compared to the other two spans.…”

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

“…Based on Section 2.1 and the methodology for analyzing the vehicle-straight bridge coupling system whilst taking into account the expansion joint and bearing support parameters [40], the equilibrium equation for vehicle-joint (bearing-bridge coupling vibration that takes into account centrifugal force can be obtained. By incorporating the influence of centrifugal force, the force exerted on the bridge by the vehicle passing over an expansion joint at the nth-order can be expressed as follows.…”

“…Based on the above mentioned, for a curved bridge with EJs, when the vehicle passes over the EJs, we can use the equilibrium equation for vehicle-joint-bridge coupling vibration taking into account centrifugal force to calculate the dynamic response of the coupling using the Newmark-β method [40]. Conversely, when the vehicle passes over the bridge deck, we can use the equilibrium equation for vehicle-bridge coupling vibration, taking into account centrifugal force, to calculate the dynamic response of the coupling.…”