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Ambient vibration survey of the bosporus suspension bridge
Author(s) -
Brownjohn J. M. W.,
Dumanoglu A. A.,
Severn R. T.,
Blakeborough A.
Publication year - 1989
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.4290180210
Subject(s) - structural engineering , tower , vibration , suspension (topology) , bridge (graph theory) , span (engineering) , engineering , finite element method , deck , natural frequency , acoustics , physics , mathematics , medicine , homotopy , pure mathematics
Abstract Traffic and wind excitation has been used to obtain the dynamic characteristics of the first Bosporus (Bogazici) Suspension Bridge. Structural symmetry and the absence of suspended side‐spans allowed attention to be focused on the main span and the Asian tower. For the main span, 18 vertical and 20 lateral modes were obtained, including torsional modes. For the tower, 12 longitudinal and 12 lateral modes were identified. All these models lie in the range 0–1‐1 Hz. A detailed comparison is given between these modes and corresponding calculated modes, obtained by use of a three‐dimensional finite element model which includes a geometric stiffness matrix. Of particular interest is the validity of the theoretical model used for the box‐deck, because of its subsequent use in response studies of asynchronous seismic excitation. Comparison with a more limited study made in 1973 shows that the bridge continues to behave as it was designed to behave, particularly with regard to the deck‐tower interface. From natural frequency measurements of two hangers, the load which they carry was assessed.