FERMO building

The basic modules " building construction " and " bridge construction " contain all options that are at least required for a prestressed concrete girder in building or bridge construction. The possible extensions are independent of each other; i.e. they can be added individually. Furthermore, it is possible to add the modules from structural building towards bridge or from bridge towards building structures.

With version 23, in addition to the regular adaptations to run under Windows and the authoritative standards, additional enhancements are available in FERMO, which make the use of the program application more versatile:

Basic functions

•     Bending capacity due to NM-interaction for required reinforcement req As, req A
•     Flexural capacity due to NM-interaction with existing reinforcement / minimum reinforcement
•     Strain check with existing reinforcement associated with the design combinations
•     Shear capacity due to V-T-VT interaction with linear stress resultants and own reinforcement material for the Web
•     Composite joint reinforcement with own reinforcement material for bond reinforcement
•     Additional design sections with detailed output of design results
•     Tensile force cover diagram available Zs + Zp ≥ req Zs + Zp
•     Summary of existing and required reinforcement including minimum reinforcement

Subsequent prestressing

•     Different prestressing steel materials per layer

Fatigue

•     Verification against fatigue of longitudinal reinforcement and prestressing steel Level 2
•     Verification against fatigue of concrete pressure level 2
•     Verification against fatigue of the tension struts (transverse or stirrup reinforcement)
•     Check against fatigue of compression struts
•     Verification against fatigue of the composite joint

Serviceability

•     Limitation of concrete compressive stresses I / II

Concrete girder Basic Module

The reinforced concrete design is carried out uniaxial. In detail, the following tasks can be solved with FERMO:

• homogenous rectangular, T-beam, slab and H-sections with variable web and flange thicknesses as well as upstand beam and V cross sections with or without bulge
• typed symmetric and non-symmetric cross-sections in longitudinal direction
• arbitrary, variable cross-section layout including cross-section offsets
• single symmetric, in special cases also asymmetric cross-section shapes, are possible but are designed uniaxial
• subsequently applied in-situ concrete slab – i.e. composite cross-sections
• varying, statically determinate systems: factory support, transport support, assembly support, auxiliary support and final support
• maximum of 8 analysis moments along the timeline from the factoring up to the end of the lifecycle
• linear stress resultants and deformations with automatic consideration of the effective slab widths
• alternative consideration of normal strength concretes (up to C50/60), high strength concretes (C55/67 up to C 100/115), ultra-high strength concrete (UHC140)
• reinforcement (up to B550), high strength reinforcement (SAS670)
• edge related single reinforcement or distributed reinforcement
• multi-layer reinforcement for single reinforcement and single-layer reinforcement for distributed reinforcement
• Fixed, inner and variable, outer reinforcement layers that can be set either automatically or user-defined
• minimum requirements for the concrete cover and durability
• fixed or elastic support with automatic calculation of the spring constants
• reliable generation of the design combinations with the aid of load case attributes
• automatic generation of load cases by copying or copying with a certain distance
• single loads, line loads, trapezoidal loads and triangular loads, temperature loads and support settlement
• loads can be arranged centric or eccentric
• linear stress resultant calculation with automatic generation of all design combinations
• optional consideration of the minimum restraint, direct / indirect support

The FERMO prestressing girder in building construction is a powerful design program for precast and composite concrete girders and has the following special features:

• Consistent program concept with overview at a glance
• Program interface can be adapted for specific tasks
• For both simple and complex engineering tasks in building and industrial construction
• Configurable output for a wide range of requirements from pre-design up to the final inspection phase incl. detail output at user defined sections
• Component-oriented load transfer with reliable transfer and organisation scheme

The combination of the prefabricated girder programs RTfermo and FETT is carried out in 2 stages through the successor program FERMO: RTfermo will be discontinued at the end of 2018 and FETT at the end of 2019. RTfermo will remain in product maintenance until 2019 and FETT until 2020.

The modular concept for FERMO corresponds in the broadest sense to the one of FETT, in which the use of high-performance concrete and fire protection design was integrated into the reinforced concrete base module.