This dissertation deals with the dynamic response of simple bridges due to a vehicle load travelling with variable velocity. The vehicle load is modelled as a point load. Two patterns of variation of velocity (acceleration and deceleration) are considered. The computer program SAP2000 was used to construct a finite element model of two simple bridges with different properties and to carry out dynamic time-history analyses to assess the maximum response of the bridges in terms of deflections and bending moment diagram envelopes. A comparison between the dynamic deflections of the accelerating and decelerating load was done. By completing a parametric study of 175 time history analyses for a family of bridges, response spectra for a vehicle accelerating and deaccelerating on a simple bridge were constructed. These spectra can be used to directly obtain the dynamic deflection of different bridges due to a vehicle travelling in a specific range of variable velocities. A comparison of the bending moment diagram envelopes between different variable velocities, and the static and dynamic bending moment diagrams were also included in the study.
|Date of Award||2018|
|Supervisor||Enrique Martinez-Rueda (Supervisor)|
- Dynamic response of bridges
- Dynamic effects of moving loads