The Model Experiments Research On Vaulted Pylon Of Cable-Stayed Bridge

Cable-stayed bridge is a common loading structural system composed by three basicbearing carriers, namely girder (bridge deck), pylon, and backstay cable anchored to the pylonand girder. Compared to bridges of other system, long-span cable-stayed bridge is highlycompetitive when crossing wide rivers and lakes or bays and straits due to the bearing systemof the backstay cable and structural characteristics of long-span consecutive crossings.Multi-pylon cable-stayed bridge proposals have all been brought up for several largestsea-crossing projects under plan by China. Therefore, the performance and security ofmulti-pylon cable-stayed bridge casts great significance on China’s large bridge constructionand healthy development.Current experimental researches of cable stayed bridge models both at home and abroadare mainly small size full-bridge model experiments or model experiments of full size sectionat anchorage zone. However, current overall semi-ellipse cable stayed pylon structuralmodeling experiments, design theory and construction supervision studies are rare though.This research project integrates characteristics of Right-Branch Cable-stayed Bridge ofMa’an Shan Changjiang Bridge, comprehensively takes Arch Tower Structural Design Theoryand key technical difficulties in Construction Monitoring into consideration, and carries outexperimental research on Arch Tower Structure Overall Prototype for the first time at homeand abroad. Firstly, Bridge Doctor, ANSYS and other bridge design softwares are adopted forcalculation and review on full bridge and whole towers under various construction conditionsto define key cross sections and point locations. Secondly, we design and construct1:10scalemodel and conduct serial researches and analysis on prestress&reinforcement stresschanging pattern for key cross sections, stress space changing pattern of anchorage zone bycombined action of pylon prestress force and stayed cables, prestress forces distribution oftower control cross section as well as cracking and destruction safety factors. The researchfindings provide significant scientific proof and technical safeguards for structural optimumdesign and safe construction of Ma’an Shan Changjiang Bridge.