FAGUS

Cross Sections
Definition and Analyses

Cross Sections

Geometry, Materials

• Cross sections are built up of one or more subsections and optional reinforcement elements
• Each subsection has its own material (out of a library) which makes it possible to treat composite sections.
• A subsection can be defined by a polygonal outline or as one or more thin walled elements, defined by their axis and thickness.
• The input of a cross section or subsection can be effected in the following ways:
  • by constructing the section using the graphics editor
  • by fetching an element from the comprehensive profile library
  • by using a parametrized cross section
  • by importing existing cross sections or subsections
• The existing library of parametrized cross sections includes frequently used types like rectangle, T, etc. and can easily be extended

Reinforcement

• Reinforcement elements can be defined as concentrated in a point or distributed along straight lines or circularly
• Tendons are concentrated in points

Shear Walls

• For cross sections with arbitrary polygonal outlines, a suitable model for designing web reinforcement can be defined separately by introducing shear walls.

Cross Section Variants

• FAGUS supports cross section variants, especially for dealing with forces, acting on different construction stages. They are defined by:
• • activating/deactivating of subsections
  • changing of material properties in subsections
  • assigning reinforcement groups to a variant

Cross Section Libraries

• Comprehensive rolled steel profile library
• Each FAGUS- and STATIK calculation can serve as cross section library of which cross sections can be imported

Interfaces

• Import and export in DXF format
• Supports Windows clipboard for texts and images
• Import of cross section data from FAGUS-3/4/5 calculations

Analyses

For all cross section types:

• Calculation of the efficiency factor (1/capacity) for a given load vector (N, My, Mz, Vy, Vz,Tx). At least one of the load components must be variable, the others may be kept constant
• Moment-curvature diagrams (My or Mz) for a series of normal force levels
• Moment-stiffness diagrams (My or Mz) for a series of normal force levels
• Evaluation of stress distribution for a given plane of strains
• Evaluation of stresses for a stepwise introduction of loads or strain distributions on subsections, which on their part can be activated step by step
• Evaluation of stress distribution for a given loading (N,My,Mz)
• General section force interaction diagrams for two components out of (My,Mz,N) being variable and the third kept constant
• N-My-Interaction diagrams for a given reinforcement or for a series of given reinforcement contents

For reinforced concrete sections:

• Design of the longitudinal and web reinforcement for a given loading

For thin walled cross sections:

• Evaluation of the shear center and the shear stress distribution for given section forces (Vy,Vz,T)

Composite cross sections wit loading steps

• Stress analysis for a stepwise introduction of subsections and loadings

Analysis Parameters

• Free choice of the parameters defining the limit states for design, verification of capacities and interaction diagrams
• Material depending resistance coefficients
• Pre- and userdefined materials, assignable to cross section elements
• Type of stress-strain diagrams for concrete, reinforcement and tendons
• Miscellaneous parameters like minimum reinforcement, angle of compression diagonals, admissible stress for web reinforcement, ...

Supported Standards

• SIA, Eurocode, DIN, OeNorm (others on inquiry)

What was new in the former generations of FAGUS