PARAMETRICAL UPDATING OF BRIDGE FINITE ELEMENT MODEL BASED ON OPTIMIZATION DESIGN THEORY

摘要

In bridge engineering, finite element models which are built based on bridge design blueprint are often different from the actual structures greatly. Considering this problem, parametrical bridge finite element model updating technology based on optimization design theory is put forward. This arithmetic takes the minimization of summation of frequency discrepancy and modal shape displacement as its optimizing goal, sets restrictive conditions to parameter modification and frequency change by engineering experience, ranges model updating problem to restriction optimization problem, and its solution uses the optimized iteration algorithm which drops based on the gradient. One simulation calculation example proves that the model modifying method raised in this paper is feasible, effective and practicable.