1. Computer Control Systems | 94-96 Kifissias Ave., 15125 Athens, Greece | +30 2108051730 | www.ccs.gr
Software for
analysis and design
of composite
road and railway
box bridges
Eurocodes
Mixte Box is an advanced software application for the design according to Eurocodes of composite
road and railway box bridges.
Mixte Box allows the analysis and design of bridges with multiple spans. A linear beam model is
constructed and the traffic loads are automatically determined according to the applied regulations.
The internal forces and stresses are then calculated and all the necessary checks are performed. The
calculations report is automatically generated.
Mixte Box is developed and owned by Computer Control Systems S.A. (CCS).
Mixte Box is the result of the high level of expertise and experience of CCS engineers in the
composite bridges domain. CCS software is being used by organizations such as the design
department of the French railways (SNCF), Design Offices, and Construction Companies such as
Eiffage Métal and Baudin Chateauneuf.
Superior solution for bridges
Eurocodes:
Ÿ Eurocode 1 - Part 2
Ÿ Eurocode 3 - Parts 1-1, 1.5, 1.9, 2
Ÿ Eurocode 4 - Part 2
Built-up box section
with constant or variable
characteristics.
Stiffened or unstiffened flanges.
Automatic generation
of section properties.
Detailed definition
of concreting schedule.
Account of slab cracking.
Automatic generation of traffic
and train loads for the design
of road or railway bridges
under service,
ultimate and fatigue limit states.
Design checks for
shear connection, welds,
stiffened web buckling,
vertical web stiffeners,
longitudinal flange stiffeners
and fatigue of sections, shear
connection, and reinforcements.
Support reactions.
Shear lag effect in global analysis,
SLS combinations and fatigue,
ULS combinations
(tension, compression).
Plate buckling of elementary
sub-panels, global buckling
of the flange.

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
Flange treatment:
Shear lag effect
Ÿ Global analysis.
Ÿ SLS combinations and fatigue.
Ÿ ULS combinations (tension, compression).
Buckling
Ÿ Plate buckling of elementary sub-panels.
Ÿ Global buckling of the flange.
Shear verification
Ÿ Shear stress check in the global stiffened
flange.
Ÿ Shear stress check in each sub-panel of
the flange.
Ÿ Interaction M-V.
Longitudinal stiffeners
Ÿ Axial Rigidity δ.
Ÿ Flexural Rigidity γ.
Ÿ Torsional Rigidity θ.
Ÿ Buckling.
Software for analysis and design
of composite road and railway box bridges
General:
Ÿ Mixte Box uses a beam element model for
the simulation of the bridge structure.
Ÿ The analysis is based on the longitudinal
bending (displacements of the axis of the
bridge) for one cross section beam.
Ÿ Issues related to the transversal geometry
of the bridge are automatically handled
(determination of loads).
Ÿ Interface: English, French.
Structural data:
An efficient graphical user interface is used
for the basic data input as described below:
Ÿ Structure topology definition (geometry)
for automatic node generation of the
linear beam model.
Ÿ Material mechanical properties definition.
Ÿ Sections geometrical characteristics
definition for box sections with automatic
calculation of their mechanical
characteristics for all stages.
Ÿ Detailed concreting phases definition.
Ÿ Definition of traffic and train loads taking
into account the torsional loads.
Ÿ Automatic generation of load
combinations and envelops.
Eurocodes:
Ÿ Automatic calculation of effective widths
at all positions.
Ÿ Automatic calculation of equivalent factors
according to the load type and the
concreting day.
Ÿ Automatic creation of reglementary loads
and combinations (SLS, ULS).
Ÿ Global analysis considering the concrete
cracking and the effect of the shear lag.
Ÿ Sections classification and reduced section
characteristics due to buckling and shear
lag.
Ÿ SLS and ULS design checks of the
composite section taking into account the
concrete cracking, the moment-stresses
redistribution and the shear lag.
Ÿ Fatigue verifications.
Ÿ Verification of the web panel stability and
stiffeners.
Ÿ Calculation and verification of the shear
connectors.
Ÿ Verification of the welds.
Ÿ Eigen values calculation of the composite
beam.
Ÿ Influence lines.
Ÿ Calculation of precamber and reactions.

4. Computer Control Systems | 94-96 Kifissias Ave., 15125 Athens, Greece | +30 2108051730 | www.ccs.gr
Superior software solutions for steel and composite structures
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.