AnaDyn is software for analyzing the dynamic behavior and fatigue of railway bridges during high-speed train passage. It creates a 3D model of the bridge accounting for dynamic load eccentricity. It performs modal analysis to determine critical velocities and calculates displacements, accelerations, stresses and bending moments. Reports are automatically generated presenting results and verifying compliance with Eurocodes. The software was developed based on the experience of engineers collaborating with French Railways to study dynamic behavior of bridges under trains.

1. Software for
dynamic and fatigue
analysis
of railway bridges
Eurocodes
Dynamic analysis
Eurocode EN1991-2
Custom cross section
Support bias
Interface with Mixte 2I
Regulatory trains
Critical velocities
Displacements
Accelerations
Warping
Support rotations
Dynamic amplification factor
Bending moments - stresses
(fatigue)
Automatic calculation report
Superior solution for bridges
AnaDyn is used in the study of the dynamic behavior of bridges during the passage of high speed
trains (TGV). The calculations and the verifications are based on Eurocodes (EN1991-2).
AnaDyn creates a wireframe spatial model that takes into account the effect of torsion due to the
eccentricity of dynamic loads relative to the axis of the bridge and produces all the results and
diagrams, needed for the creation of comprehensive reports.
AnaDyn creates automatically a report including all the verifications required by the Eurocodes,
based on the values of the acceleration, the warping, the support rotations, the dynamic
amplification factors, the bending moments-stresses for fatigue.
AnaDyn is developed and owned by Computer Control Systems S.A. (CCS).
AnaDyn is the outcome of the experience which the civil and software engineers of CCS have
acquired from collaborating over the years with the French Railways (SNCF) in the field of dynamic
behavior of bridges during the passage of trains. CCS software is being used by organizations such
as the design department of the SNCF, Design Offices, and Construction Companies such as Eiffage
Métal and Baudin Chateauneuf.
Computer Control Systems | 94-96 Kifissias Ave., 15125 Athens, Greece | +30 2108051730 | www.ccs.gr

2. Superior software solutions for steel and composite structures
Hundreds of road and railway bridges
have been designed with Bridge software suite.
CCS has an extensive experience in
the field of composite road and
railway bridges, due to the
realization of many studies of
bridges and the development by a
highly skilled team, of computer
applications for solving specific
problems for bridges, according to
Eurocodes. This particular
specialization was acquired through
regular collaborations with French
national organizations such as SNCF,
CTICM and SETRA.
CCS has developed custom software
applications for SNCF such as: PACT
(analysis of the dynamic behavior of
a bridge when high velocity trains
pass over it), RaBPMx (analysis,
design and automatic drawing
production of composite railway
two-girder bridges) PIVOT
(calculation of interaction between
rail track and bridge under the
acceleration or deceleration of high
velocity trains).
Bridge Software Suite
Analysis and design
of composite road and railway
two-girder bridges
Eurocodes and French regulations
Analysis and design of composite
road and railway box bridges
Eurocodes
Pre-design of composite
road and railway bridges
at conception phase
Eurocodes
Dynamic and fatigue analysis
of railway bridges
Eurocodes
Expertise and Innovation
Verifications of composite
road and railway bridges
Eurocodes

3. Computer Control Systems | 94-96 Kifissias Ave., 15125 Athens, Greece | +30 2108051730 | www.ccs.gr
Results:
Ÿ The results are displaying in tables and in
diagrams.
Ÿ The eigenmodes are displayed as
diagrams.
Ÿ For each train and each passage velocity
the following results are displayed:
maximum and minimum values of vertical
displacements, rotations Rx and Rz, vertical
accelerations and warping values.
Ÿ The time variation of these quantities is
presented in diagrams for the worst case.
Ÿ For each train and each passage velocity,
the values of the dynamic amplification
factors at the midpoint of each of the
spans, is displayed.
Ÿ For the fatigue train and the two critical
velocities, the time variation of the
bending moment for the remarkable
sections are displayed for the worst case.
Ÿ The time variation of the bending moment
diagram is shown for the worst case.
Software for dynamic and fatigue analysis of railway bridges
Structural data:
An efficient graphical user interface is used
for the basic data input as described below:
ΠThe topology of the structure is defined
from the span lengths of the bridge, the
distance between two tracks with respect
to the axis of the bridge and the bias
angles of the supports.
 The sections are defined generically by
their surface A, their bending inertia Iz
and torsional inertia It.
Ž The displacement and rotational masses
are provided for each section and for two
of the estimated cases of mass (mass low
and high).
 The software calculates the eigenmodes
to be used in the dynamic analysis by
allowing the user to make their own
selection.
 The selection of critical velocities is
assisted by the automatic calculation of
critical velocities over all selected modes
and relevant trains.
AnaDyn can import special files from a
Mixte 2I or Mixte Box project that define
the topology of steps 1 to 3. Reports:
The reports are automatically generated and
contain:
Ÿ Header page.
Ÿ Assumptions of the dynamic calculations.
Ÿ Main structural data.
Ÿ Results of modal analysis.
Ÿ Analysis of the critical velocities.
Ÿ Dynamic results - high mass case.
Ÿ Dynamic results - low mass case.
Ÿ Dynamic results - average mass (fatigue)
case.
Ÿ Regulatory verifications.
General:
Ÿ The problem is treated in the linear
domain.
Ÿ The wireframe model is composed of
beam elements with 3 degrees of freedom
at each end (displacement Dy, rotation Rx,
and rotation Rz).
Ÿ Three models are automatically generated,
one based on a low estimate of the mass,
another based on a high estimate of the
mass and one more for fatigue
calculations using the average mass.
Ÿ The critical velocities of passage are
automatically calculated for each EC train.
Ÿ The EC trains are processed automatically
to history loads according to their passage
velocities.
Ÿ The dynamic analysis method is the modal
superposition in the time domain.
Ÿ The step for the integration of dynamic
equations is proposed by the software.
Ÿ A static calculation for each train (convoy
type) is provided.
The extensive experience that CCS has
accumulated in the field of structural
dynamics, has led to the selection of the most
effective analysis methodology.
The calculations are performed quickly
without any loss of accuracy.
The wizard-based user interface is easy to
use, while the automatic generation of the
comprehensive reports and the built-in
expertise facilitate the task of the engineer.

4. Computer Control Systems | 94-96 Kifissias Ave., 15125 Athens, Greece | +30 2108051730 | www.ccs.gr
Computer Control Systems S.A. (CCS) was established in 1987 in Athens. Greece. Its initial legal form was Ltd and in 1992 it was
reformed to S.A. (shareholding company). Our main business is the production of software and the provision of services. The
extensive expertise in the sectors we operate, combined with highly skilled scientific and technical personnel and consistent after-
sales support, ensure customer satisfaction and long-term collaboration.
CCS has a strong commitment for quality in the design, development and support of its products and is certified with ISO 9001 since
1999 for “Design / Development Installation and support of Information Technology products and solutions and elaboration of
applied mechanics studies”.
The Engineering Division of CCS is unique for its commitment in serving the steel industry and has gained an excellent reputation
for the high level of expertise, the innovation in software, and the quality of services and engineering studies. Hundreds of structural
engineers, design offices, contractors, steel suppliers and fabricators have chosen to rely on our services in order to achieve superior
productivity and competitiveness.
Computer Control Systems | 94-96 Kifissias Ave., 15125 Athens, Greece | +30 2108051730 | www.ccs.gr
Superior software solutions for steel and composite structures