Analysis of Influence of Structural Parameters of Unequal Height Double Thin-Walled Piers on Mechanical Behavior of Continuous Rigid Frame Bridge
When the height difference between adjacent piers of a continuous rigid frame bridge with double thin-walled piers is significant due to terrain and geomorphic reasons,unequal height double thin-walled piers are often used in the design.Compared with conventional double thin-walled piers,there are few experiences and conclusions available for reference in the design and optimization of unequal height double thin-walled piers.In order to clarify the influence of structural parameters of unequal height and double thin-walled piers on the mechanical behavior of continuous rigid frame bridges,a prestressed concrete continuous rigid frame bridge with unequal height and thickness of double thin-walled piers is taken as the background.By changing the wall thickness and spacing of low piers,and adopting single factor analysis method,the finite element numerical analysis method is used to analyze the influence of pier structural parameters on the mechanical behavior of continuous rigid frame bridge structure in view of the dead load effect of the structure,the stability of the maximum cantilever state and the natural vibration of the structure.The results show that under the action of dead load,the wall thickness of the low pier has little influence on the bending moment at the root of the main beam but has a relatively large influence on the bending moment at the middle of each span.Increasing the distance between the two legs can significantly reduce the bending moment at the middle and root of the main span.The stability safety factor of low pier is more sensitive to the wall thickness.The unstable mode is not affected by the pier parameters.As the wall thickness and spacing of low piers increase,the natural frequency of the structure increases.The wall thickness and spacing between two legs affect the first-order vibration mode of the structure,with wall thickness having the most significant impact on the first-order natural vibration.The research conclusions of this article can provide a reference for the structural design and optimization of continuous rigid frame bridges with unequal height double thin-walled piers.
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