Composite Checks

Composite code checks are based on the Open Checks technology and SCIA Design Forms. However, in order to avoid duplicate input of some of the data and to take most advantage of the CAM, all input needed for composite checks have been centralized in the composite service in the Composite Beam Data member attribute and in the Composite setup.

This chapter gives detailed information about the settings available in the Composite setup and in the Composite Beam Data which are related to the composite checks.

Some general information about how to use the checks is also provided. Theoretical background about the content of the checks is not provided here. References to the appropriate code articles are usually provided in the detailed output of the checks themselves.

For more information about Open Checks and SCIA Design Forms, please refer to "Open Checks: Link with Scia Design Forms".

Composite Setup

The composite setup is accessible from the composite service tree.

The settings related to the analysis model (CAM) have been detailed already in the previous chapter "Spřažený výpočtový model ve SCIA Engineer". The rest of the settings are related to the composite checks. Most of them define default settings to be used for composite members without specific settings. Those settings can be overriden (marked overridable in the table below) by means of Composite Beam Data attributes (see next chapter "Composite Beam Data").

Shear connectors  
Connectors per row

number of connectors per row (perpendicularly to the axis of the beam)

overridable

Rows per span

total number of rows of connectors in one span; used in case the corrugation of the sheeting is parallel to the beam

overridable, only EN1994

Placement

used in case the corrugation of the sheeting is perpendicular to the beam

overridable, only EN1994

Number of rows (between points of min & max moment)

number of rows of connectors between the points of min and max moments in one span

overridable, only AISC 360-10

Welding of connectors

method of welding of the shear connectors

  • through the steel sheeting: the connectors are welded together with the sheeting to the beam
  • directly to the beam: the connectors are placed in openings in the sheeting and welded directly to the beam

overridable

Calculation approach

approach for the calculation of the connectors

  • design: the composite check returns the number of required shear connectors to fulfil the code requirements, based on the provided assumptions (placement or rows per span are then not used for the calculation)
  • check: the composite check controls whether the provided shear connectors fulfil the code requirements

overridable

Slab reinforcement  
Longitudinal

Bar diameter, bar spacing and concrete cover of reinforcement bars in the slab parallel to the beam

overridable

Transversal

Bar diameter and bar spacing of reinforcement bars in the slab perpendicular to the beam

overridable

Deflections  
Camber type

type of definition of the camber value

  • absolute: the camber is defined as a fixed value (in the length units defined in the general settings of SCIA Engineer)
  • relative: the camber is defined as a ratio of the span length, e.g. L/200
  • deflection ratio: the camber is defined as a ratio of the cumulated deflection in construction stage and final stage, long term, i.e. usually all permanent loads

overridable

Camber value

camber value for type absolute, defined as a fixed length

overridable

Camber value L/x

camber value for type relative, defined as a ratio of the span length, e.g. L/200

overridable

Camber value as deflection ratio

camber value for type deflection ratio, defined as a ratio of the permanent deflection

overridable

Limit deflection for construction stage limit allowable deflection for deflection check in construction stage, defined as a ratio of the span length
Limit total deflection in final stage limit allowable deflection for total deflection check in final stage, defined as a ratio of the span length
Limit permanent, long term deflection limit allowable deflection for permanent deflection check in final stage, defined as a ratio of the span length
Limit additional deflection in final stage

limit allowable deflection for deflection check under variable actions in final stage, defined as a ratio of the span length

EN1994 only

Composite Beam Data

The composite beam data is accessible from the composite service tree. It can be added to any composite beam.

The composite beam data attribute allows to override for a specific composite beam the default settings defined in the composite setup. For each group of settings (e.g. shear connectors or slab reinforcement) it is possible to separately specify if the default settings must be used or rather some customized values.

Most of the composite beam data settings get their default value from the composite setup. A few exceptions exist, which are mentioned in the table below.

Name name of the composite beam data attribute
Member read-only; name of the related composite beam
Shear connectors  
Input type

override setting

  • from setup: use the values defined in the composite setup for shear connectors
  • manually: define specific values overriding the defaults
Type

type of shear connectors, selected from the shear connectors library (see below "Shear connectors library")

There is no default value for this setting in the composite setup. The default is taken as the first shear connector type available in the shear connectors library. This applies for composite beams without composite beam data.

Connectors per row

number of connectors per row (perpendicularly to the axis of the beam)

Rows per span

total number of rows of connectors in one span; used in case the corrugation of the sheeting is parallel to the beam

only EN1994

Placement

used in case the corrugation of the sheeting is perpendicular to the beam

only EN1994

Number of rows (between points of min & max moment)

number of rows of connectors between the points of min and max moments in one span

only AISC

Welding of connectors

method of welding of the shear connectors

  • through the steel sheeting: the connectors are welded together with the sheeting to the beam
  • directly to the beam: the connectors are placed in openings in the sheeting and welded directly to the beam
Calculation approach

approach for the calculation of the connectors

  • design: the composite check returns the number of required shear connectors to fulfil the code requirements, based on the provided assumptions (placement or rows per span are then not used for the calculation)
  • check: the composite check controls whether the provided shear connectors fulfil the code requirements
Slab reinforcement  
Input type

override setting

  • from setup: use the values defined in the composite setup for slab reinforcement
  • manually: define specific values overriding defaults
Material

reinforcement steel material for the slab reinforcement

There is no default value for this setting in the composite setup. The default is taken as the default reinforcement steel material from project settings (EC-EN) or as the first available reinforcement steel material in the library of materials. This applies for composite beams without composite beam data.

Longitudinal

Bar diameter, bar spacing and concrete cover of reinforcement bars in the slab parallel to the beam

Transversal

Bar diameter and bar spacing of reinforcement bars in the slab perpendicular to the beam

Deflections  
Input type

override setting

  • from setup: use the values defined in the composite setup for camber
  • manually: define specific values overriding defaults
Camber type

type of definition of the camber value

  • absolute: the camber is defined as a fixed value (in the length units defined in the general settings of SCIA Engineer)
  • relative: the camber is defined as a ratio of the span length, e.g. L/200
  • deflection ratio: the camber is defined as a ratio of the cumulated deflection in construction stage and final stage, long term, i.e. usually all permanent loads
Camber value

camber value for type absolute, defined as a fixed length

Camber value L/x

camber value for type relative, defined as a ratio of the span length, e.g. L/200

Camber value as deflection ratio

camber value for type deflection ratio, defined as a ratio of the permanent deflection

Shear connectors library

The composite shear connectors library is accessible as any standard library, from the Libraries menu (composite sub-menu), from the main tree view (Libraries>Composite branch) and from the composite beam data attribute, when assigning shear connectors to a composite beam (see above "Composite Beam Data"). A selection of pre-defined shear connectors is available in the system library ().

Name

name of the shear connector type

Type

generic type of connector; possible values are Stud, Hilti, Channel and Bar hoop

Catalogue catalogue designation, can be any text, keyword... may be used for filtering the library (using the catalogue filter). Typical use would be the name of the manufacturer or the name of the product range
Diameter/width cross-sectional dimension of the connector; typically diameter of a stud
Nominal height nominal height of the connector for the calculation of the resistance
Material steel material of the connector

All settings above are transmitted to the composite checks. They do not affect the analysis model.

Composite Checks

All composite checks are accessible from the composite service tree. They are displayed after a successful analysis of the structure (analysis results available).

General use of the composite checks

All composite checks use the same standard settings as other result services in SCIA Engineer. Results are available as text and graphical output. The text output can be obtained in a summary table output (only main results, one row per result) or as detailed output (full details of check, with intermediate results…).

Name name of the selected check
Selection selection of entities on which the check will be performed (all, current, advanced, named selection, design group)
Type of loads type of actions to be used for the check (load case, combination, result class)
Load case selected load case for the check (in case type of loads = load case)
Combination selected load case combination for the check (in case type of loads = combination)
Class selected result class for the check (in case type of loads = class)
Combinator strategy

strategy used for handling envelopes

  • Strain strategy: so-called dangerous combinations, which are assumed to produce most critical results, are determined according to the following rules; example for internal forces in 1D members, the check is performed at most for each of the following 20 dangerous combinations (duplicates are eliminated):
    • 12 combinations producing extreme values (min and max) of each of the 6 internal forces components
    • 8 combinations producing extreme longitudinal strains (min and max) in each corner of an idealized rectangular cross-section having the same stiffness components than the considered cross-section
  • All possible combinations: all possible combinations from the selected envelope are processed; WARNING! this might lead to extremely long computation time!
Filter standard filter on members (wildcard, cross-section, material, layer)
Print combination key when enabled, print the combination key along with the results in the text output
Values selection of the value(s) for graphical representation
Extreme extreme selection mode (section, local, member, interval, cross-section, global)
Output

text output format

  • brief: table output, one row per result (depending on the selected extreme setting)
  • detailed: full, detailed output of the check
Drawing setup 1D detailed configuration of graphical output
Section sections for which the check must be performed on each selected member (all, ends, inputted, inputted+ends)
Refresh >>> action button: perform the check
Autodesign >>> action button: autodesign according to selected settings; filter must be cross-section (see more detailed explanation in Autodesign manual "AutoDesign - globální optimalizace")
Split CSS >>> action button: split cross-section optimization according to unity check value of selected members
Unify CSS >>> action button: assign the same cross-section to several members having different cross-sections
Preview >>> action button: display the text output window

Available checks in SCIA Engineer 15

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