Assessment of Non-Linear Static Analysis of Irregular Bridges

摘要

The non-linear static procedures for the seismic analysis has been the focus of extensive research, particularly for the analysis of bridges. Two relevant aspects for the success of these procedures are the reference point selection and the lateral load configuration applied to the deck. The effect of these parameters was assessed in this study by the analysis response of eight bridges with different level of transverse stiffness irregularity. A lumped plasticity and distributed plasticity analysis methods were developed for the response evaluation, considering six different combinations of the reference point and lateral load configuration. Based on the results, the reference point plays an important role in the displacement configuration, shear base distribution and characteristics or the capacity curve. Due to the sequential damage observed for increasing levels of seismic intensity, an adaptable load configuration is advisable for improving the accuracy of the analysis response of irregular bridges.