Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Torsional instability in suspension bridges: the Tacoma Narrows Bridge
  case   All attempts of aeroelastic explanations for the torsional instability of
suspension bridges have been somehow criticised and none of them is unanimously
accepted by the scientific community. We suggest a new nonlinear model for a
suspension bridge and we perform numerical experiments with the parameters
corresponding to the collapsed Tacoma Narrows Bridge. We show that the
thresholds of instability are in line with those observed the day of the
collapse. Our analysis enables us to give a new explanation for the torsional
instability, only based on the nonlinear behavior of the structure.

18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con