High Pier Span Bridge Stability Simulation Analysis

Bridge with high pier and long span uses high-strength materials and thin-wall structure and often adopts segmental construction method, the effect of concrete elastic modulus and creep and shrinkage are significant, so aging stability analysis research has important significance.This paper aims at bridge with high pier and long span adopting single or double featheredge piers, the stability of bridge in the whole construction process is analyzed combined with research conclusion of bridge stability and concrete creep and shrinkage, bridge construction period is divided according to actual construction-process and concrete creep and shrinkage regularity and structure is analyzed as plane truss at each time increment. Concrete elastic modulus and concrete creep and shrinkage variety at different time are reckoned in by using time increment analysis method and concrete creep and shrinkage secondary force is calculated by using effective elastic modulus. Bridge stability analysis program is developed on the base of structure matrix displacement method, the program adopts Visual Basic language, has friendly interface and visual data input windows. The buckling safety factor of currently finished structure is given as result. Examples are calculated in the paper to check reliability of the calculation method and the running result of program, and get expected effect.