Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The TR-BDF2 method for second order problems in structural mechanics   The application of the TR-BDF2 method to second order problems typical of
structural mechanics and seismic engineering is discussed. A reformulation of
this method is presented, that only requires the solution of algebraic systems
of size equal to the number of displacement degrees of freedom. A linear
analysis and numerical experiments on relevant benchmarks show that the TR-BDF2
method is superior in terms of accuracy and efficiency to the classical Newmark
method and to its generalizations.

22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat