THE INFLUENCE ANALYSIS OF CREEP FACTORS ON LONG-TERM DEFORMATION OF PC CONTINUOUS RIGID-FRAME BRIDGE
Creep,inherent characterize of concrete structure,is main reason of long-term deformation of long-span concrete bridge.Creep factors,such as concrete loading age,relative environment humidity,temperature and prestress,are significant affect on long-term mechanical properties for concrete bridge.Because of the strong crossing ability,big global stiffness,nice appearance,comfortably driving and low price,the application prospect of PC continuous rigid-frame bridge is better than other long span bridges.It is unclear for the creep analysis of a continuous rigid-frame bridge because the creep rule is very complicated.With the development of transport infrastructure,there is an urgent need to find precise creep rules to resolve the practical bridge.So based on Midas large-scale finite analysis software,finite model of a three-span prestress concrete continuous rigid bridge is established to simulate creep of a real bridge.This paper starts from further improving creep calculation methods for prestress concrete bridges.The influence analysis on concrete loading age,the relative environment humidity,temperature and prestress of creep factors is developed,to obtain influence rule of mid-span and side-span long-term deformation with varies factors,utilizing effective model method adjusted with age.Research result show,long-term deformation of prestress concrete continuous rigid bridge increase with concrete loading age,relative environment humidity and prestress decrease,with temperature increase.And the influence increase with the bridge span increase.The research provides theoretical basis for design and construction of long-span concrete bridge.
Continuous rigid-frame bridge creep creep factors long-term deformation
Zhifang Lu Muyu Liu
Hubei Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology, Wuhan 430070, P.R.China
国际会议
The Twelfth International Symposium on Structural Engineering (第十二届结构工程国际研讨会)
武汉
英文
1464-1467
2012-11-17（万方平台首次上网日期，不代表论文的发表时间）