Experimental and analytical model analysis of Babolsar's steel arch bridge

摘要

The paper presents the experimental and analytical model analysis of a steel-girderrnarch bridge. The field test is carried out by ambient vibration testing under traffic excitations. Bothrnthe peak picking method in the frequency domain and the stochastic subspace identification methodrnin the time domain are used for the output-only model identification. A good agreement inrnidentified frequencies has been found between the two methods. It is further demonstrated that thernstochastic subspace method provides better mode shapes. The three-dimensional finite elementrnmodels are constructed and an analytical model analysis is then performed to generate naturalrnfrequencies and mode shapes in the three-orthogonal directions. The finite element models arernvalidated to match the field natural frequencies and mode shapes