Identification and Assessment of Damage to Arch Bridge Booms Based on Quasi-static Strain Impact Lines
摘要
In order to solve the problem of accurate identification of arch bridge boom damage, in this study a simplified mechanical model of an under-bearing tied arch bridge was established and the analytic formula of boom strain influence line of under-bearing tied arch bridge was obtained by force method derivation. Based on that, the damage identification method boom was proposed based on quasi-static strain influence line index of under-bearing tied arch bridge. Then the applicability of the method for conventional boom number arch bridge was verified with the help of finite element method. And the influence of test noise, damage location, damage degree, and damage category on the damage assessment results was studied by using finite element model calculations. A scientific implementation plan for vehicle loading was proposed. The results showed that within 10% test noise, the quasi-static strain-influence line difference curvature method could accurately locate the local damage location of arch bridge booms and quantitatively assess their damage degree. The method still had a good recognition effect when other structures, such as tie beams, wind braces, and arch ribs, were damaged.