Research On Structural Performance For Self-anchored Suspension Bridge

The self-anchored suspension bridge with single tower becomes very competitive bridge scheme in span scope of 100 to 300 meters for its advantages like fine visual effect,well adaptability to topography and geology.It has rapid development at home and abroad.The text regards Xiangjiang River Bridge between Xiangtan and Shaohua as the background of project,takes advantage of finite element software Midas and Ansys,to calculate,analyze and model supportive construction.It studies the loading features for the bridge type of self-anchored suspension bridge with single tower,and provides some beneficial suggestions and evidences for design and construction of bridge.The contents of main study are as follows:1.The thesis firstly summarizes the analytic method of cable system of self-anchored suspension bridge.The analytic method mainly concludes numerical computation method without regard to stiffening girder and finite element technique which think of the influences of stiffening girder.2.Based on the fundamental principle about finite element of bridge and MIDAS,it recitals and analyzes the aspects like main cable,crowfoot,foundation restraint,simulation of base connection during building bridge model.It also discusses and analyzes the aspects like modeling step,mesh generation,restraint way during building entity model based on ANSYS.3.The thesis calculates completed bridge line shape of supportive construction,line shape of unloaded cable,prepared offset of cable saddle,the transformation and internal force of suspension bridge under effect of construction,operation and load,and analyzes the computed result.According to above analysis,it discusses spatial effect of supportive project under the effect of construction,operation and load,and summarizes its loaded characteristic.4.The supportive construction's steel-concrete composite segment and cable saddle have complex structure.The text analyzes them by building entity element model.The bridge's construction of steel-concrete composite segment has great influence on stress distribution of structure.The reasonable layout form leads to bigger principal tensile stress;also,the stress concentration which caused by local structure of cable saddle need to pay enough attention.