Abstract
Taking the three-span pre-stressed concrete continuous rigid frame bridge as an engineering example, MIDAS Civil was utilized to establish a spatial finite element model and the interaction between pile foundation and the soil was simulated by equivalent soil spring. In addition to analyzing shearing force, bending moment and stress of the primary beam's characteristic section under different loads, a response spectrum method and time history analysis were adopted to conduct seismic response analysis respectively. In this case, performance of the bridge could be comprehensively evaluated. Relevant analysis results indicate that internal force of the large-span pre-stressed concrete continuous rigid frame bridge is mainly induced by gravity and pre-stress of the structure; section stresses of the primary beam satisfy the corresponding specification and structural safety can be achieved in a state of operation. Moreover, computed results obtained by the response spectrum method is more conservative than those of the time history analysis. In terms of continuous rigid frame bridge, different seismic directions should be taken into consideration during structural seismic analysis at different construction stages.
Highlights
Pre-stressed concrete continuous rigid frame bridge is featured with light and graceful structure, beautiful shape, great spanning ability and high riding comfort, etc
Seismic response analysis was performed for the bridge by response spectrum method and time history analysis
This demonstrates that results acquired by response spectrum method are more conservative than those by time history analysis as far as the bridge is concerned; and, from the angle of structural safety, response spectrum method should be employed for the bridge to conduct seismic performance design and checking
Summary
Pre-stressed concrete continuous rigid frame bridge is featured with light and graceful structure, beautiful shape, great spanning ability and high riding comfort, etc. Without any doubt, it has become the preferred bridge type in mountainous areas where the expressway needs to step over terrain such as canyons. According to the phase difference of seismic waves and the behavior of foundation soil layers, Sh.X. Zhang and Sh.Zh. Xi et al [1] investigate their influence on rigid frame bridge; D.Sh. Zhu and Sh.Zh. Liu et al [2] analyze impacts of pier beam joining type and radius of curvature, etc. Three-span pre-stressed concrete continuous rigid frame bridge was taken for example and the equivalent soil spring was selected to simulate
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