Tongxiang An

Stability analysis of the effect of soil settlement on a cable-stayed bridge in the mekong river delta

Soil settlement has a significant influence on cable-stayed bridges, especially in the Mekong River Delta, where most sites exhibit poor geological conditions. In this paper, the Can Tho Bridge was used as a prototype; two numerical models were generated using the details of the geometry, materials, and loads of the actual bridge. One model was used to evaluate the construction stage, and the other was used for the operational (or service) stage. Displacements of the substructure were applied to both models to discover their effect on the cables, an essential part of a cable-stayed bridge. The results showed that vertical displacements have a major influence on the stability of a cable-stayed bridge during the service stage. In addition, rotational and horizontal settlement creates unexpected effects that can neutralize the most critical working conditions of cable systems. However, soil settlement does not play a significant role in the construction stage.

Seismic Resistance Assessment of Multi-span Continuous Bridge in Vietnam by Dynamic Response Analysis

The response of the bridge subjected to seismic excitation can be evaluated by dynamic response analysis method. Vietnam is located at moderate seismic area; however, the seismic design has been introduced to secure the essential and important bridges. In this study, a typical concrete girder bridge in Vietnam (multiple frames in the longitudinal direction) is used to seismic resistance evaluations. These evaluations are performed by performing nonlinear dynamic response analysis on FEA method. It is found that the stopper and the rubber gasket influence on response of the bridge during Level 1 and Level 2 earthquakes.