Deformation Control Analysis of Long-span Continuous Beam-arch Composite Bridge during Key Stages of Construction
During the construction stages of long-span continuous beam-arch composite bridges,the deformation of key components such as the main beam and arch ribs is influenced by various combined factors.To investigate the deformation behavior of the main beam and arch ribs during construction of a Nielsen system skewed continuous beam-arch composite bridge,an analysis of deformation control during key construction stages was conducted.Taking a long-span Nielsen system skewed continuous beam-arch composite bridge as an example,numerical simulations were performed to analyze the deformation patterns of critical sections at each construction stage.The results show that:1)At each construction stage,the skew effect of the main beam is significant,and the main beam exhibits notable coupled bending-torsion deformation,leading to a substantial difference in the vertical displacement of the left and right webs.The vertical displacements of the webs are anti-symmetrically distributed about the midspan section;2)Additionally,due to the asymmetric arrangement of the arch ribs and hangers,the deflection of the left and right arch ribs is generally anti-symmetrically distributed about the arch crown section.This study can provide guidance and reference for the design and construction of similar long-span continuous beam-arch composite bridges.
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