Comparison of Technical Schemes for the Main Bridge of a Super-large Viaduct for Passenger Transportation
The super-large viaduct for passenger transportation spans river valleys between mountains,forming a bridge group with the other four parallel bridges built within a short river span.Due to terrain constraints and high water flow velocities,the river flow and bed morphology undergo complex changes influenced by pier positions.This paper compares and studies three different bridge alignment schemes for this viaduct.It analyzes the evolution of the riverbed and predicts its trends,and finally examines the main beam structures and technical characteristics of three different types of large-span railway bridges.The results indicate:(1)The scheme aligning with two parallel highway bridges offers favorable geometric conditions with minimal impacts on navigation and railway operations.(2)The overall stability of the riverbed in the bridge area suggests that bridge construction will not cause significant changes in the river section.(3)Key considerations for prestressed concrete continuous beam bridge design include effective control over post-construction creep;cable-stayed bridges offer high overall stiffness and good economic benefits;and hybrid girder cable-stayed bridges provide clear load-bearing systems,aesthetic structures,and favorable stiffness conditions.
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