Structural Health Monitoring of a Brazilian Concrete Bridge for Estimating Specific Dynamic Responses

A 3D coupled model to simulate vehicle-bridge interactions (VBI) to estimate its structural responses and impact factors (IMs) was developed in this study. By structural health monitoring (SHM) of a real concrete bridge, several data were collected to calibrate the bridge model by the finite element method (FEM). These models provide the bridge response in terms of vertical displacements and accelerations. VBI models provide reliable outputs without significantly altering the dynamic properties of the bridge. Modified recent analytical equations, which account for the effects of the asymmetric two-axle vehicles, were developed numerically. These equations, plus some proposed solutions, also quantified the vehicle response in terms of accelerations to estimate a more conservative driving comfort. The goal consisted in fitting the SHM with numerical and analytical models to find a more appropriate response for safety purposes and maintenance. From the codes and the literature, it was shown that a unique IM factor was not found. Moreover, most approaches underestimate the phenomena; in fact, results show that a monitored IM factor is 2.5 greater than IM from codes. Proposed equations for vehicle accelerations provided more conservative values up to about three times the standard comfort value.

Automated summary

A 3D coupled model was developed in this study to simulate vehicle-bridge interactions and estimate the structural responses and impact factors. Structural health monitoring data from a real bridge were used to calibrate the finite element bridge model. Numerical equations were developed to account for the effects of asymmetric two-axle vehicles. By combining the monitoring data with numerical and analytical models, a more appropriate response for safety and maintenance purposes can be obtained.