Command

The previous chapter says about the procedure of calculation Design As for 2D members. Here the presentation possibilities are described. There is completely new item in the tree Concrete > Reinforcement design > 2D members > Reinforcement design (ULS+SLS).

Generally, there is a possibility to present four types of reinforcement. Nevertheless shear reinforcement is available only for "Required" and "Required (statically)" , because shear reinforcement is not supported for basic and additional reinforcement.

• Required - statically required reinforcement from ULS and SLS including detailing provisions
• Required (statically) - purely statically required reinforcement from ULS and SLS
• Required (additional) - additional required reinforcement which is needed besides provided (basic + additional reinforcement)
• Provided - basic + additional reinforcement

There is also standard command for 2D with the following items.

Loadcases, Combinations, Classes

There is possible to select loadcase, combination or classes in the command. Based on the selection the checkboxes for limit states are offered see Limit state condition part. Additionally, there is a new logic during preparation of internal forces for calculation based on combination type. It is not necessary to define all relevant SLS combinations (characteristic / frequent / quasi-permanent). It is good enough to define one of them and the others are automatically generated on the background. The information about that is stored in Standard or Detailed output.

Generally, there is used Characteristic combination for crack verification and quasi-permanent for crack width itself. Nevertheless some NA requires different combi type than Standard EN, typically NEN NA uses frequent combination for crack width calculation. All these NA dependencies are also included in design procedure.

General settings

Except typical general setting for command there are the following typical for 2D members

• Averaging of peak - check box YES/ NO
• Location - In centres / In nodes avg. / In nodes no avg. / In nodes avg. on macro
• System
  • LCS mesh element - usually used and recommended
  • Global - can be used in case of hyperbolic / parabolic shells and such atypical structures
• Type of values - there are five types of values for particular selection and its values

Required	Required (statically)	Required (additional)	Provided

• Standard results - check box set as default ON, drawing of iso-plots
• Results on sections - in case the sections are defined the results of internal forces can be evaluated on these items
• Result on edges - results of internal forces can be evaluated on all edges of the 2D members

It is recommended to calculate provided reinforcement in Location - In centres because results are presented on centres of mesh elements as string (diameter / spacing in mm). This string results cannot be drawn when location in nodes or any averaging is used.

Explanation to values

Required

• A_s,req,1+ - statically required reinforcement for ULS nad SLS including detailing provisions for first direction of reinforcement and upper surface
• A_s,req,2+ - statically required reinforcement for ULS nad SLS including detailing provisions for second direction of reinforcement and upper surface

• A_s,req,1- - statically required reinforcement for ULS nad SLS including detailing provisions for first direction of reinforcement and lower surface
• A_s,req,2- - statically required reinforcement for ULS nad SLS including detailing provisions for second direction of reinforcement and lower surface

Required (statically)

• A_s,ult,1+ - statically required reinforcement based on ULS for first direction of reinforcement and upper surface
• A_s,ult,2+ - statically required reinforcement based on ULS for second direction of reinforcement and upper surface

• A_s,ult,1- - statically required reinforcement based on ULS for first direction of reinforcement and lower surface
• A_s,ult,2- - statically required reinforcement based on ULS for second direction of reinforcement and lower surface

 

• DA_s,serv,1+ - increment of statically required reinforcement based on SLS for first direction of reinforcement and upper surface
• DA_s,serv,2+ - increment of statically required reinforcement based on SLS for second direction of reinforcement and upper surface

• DA_s,serv,1- - increment of statically required reinforcement based on SLS for first direction of reinforcement and lower surface
• DA_s,serv,2- - increment of statically required reinforcement based on SLS for second direction of reinforcement and lower surface

 

• A_sw,stat - statically required shear reinforcement based on ULS

Required (additional)

• A_s,add,req,1+ - additional required reinforcement for ULS nad SLS in case of provided reinforcement is not sufficient for first direction of reinforcement and upper surface
• A_s,add,req,2+ - additional required reinforcement for ULS nad SLS in case of provided reinforcement is not sufficient for second direction of reinforcement and upper surface

• A_s,add,req,1- - additional required reinforcement for ULS nad SLS in case of provided reinforcement is not sufficient for first direction of reinforcement and lower surface
• A_s,add,req,2- - additional required reinforcement for ULS nad SLS in case of provided reinforcement is not sufficient for second direction of reinforcement and lower surface

Provided

• A_s,prov,1+ - provided reinforcement for first direction of reinforcement and upper surface
• A_s,prov,2+ - provided reinforcement for second direction of reinforcement and upper surface

• A_s,prov,1- - provided reinforcement for first direction of reinforcement and lower surface
• A_s,prov,2- - provided reinforcement for second direction of reinforcement and lower surface

In case of checkbox "Consider user reinforcement" is switched on and this reinforcement is physically placed on the structure then Provided reinforcement represents also this User reinforcement.

Limit state condition

There is a new part related to selection of Limit state condition for design. This group consists of three checkboxes for selection.

• Design ULS - design based on ULS conditions only
• Design SLS (crack width) - SLS design based on satisfying limits for crack width
• Design SLS (reinf stress) - SLS design based on satisfying limits for stress in the reinforcement

 

All these checkboxes above are not always seen. The display of these items depends on the selection of load type as follows:.

• Loadcase - possibility to select Design ULS and also Design SLS
• ULS combination (linear ULS, envelope ULS, code ULS, nonlinear ULS) - possibility to select Design ULS only
• SLS combination (linear SLS, envelope SLS, code SLS, nonlinear SLS) - not possible to select at all
• Class - it depends on the content of the class
  • Class containing loadcases only - possibility to select Design ULS and also Design SLS
  • Class ULS combi only - possibility to select Design ULS only
  • Class SLS combi only - not possible to select at all
  • Class LC+ULS combi - possibility to select Design ULS (ULS combi or LC) and also Design SLS (LC only)
  • Class LC+SLS combi- possibility to select Design ULS(LC only) and also Design SLS (LC or SLS combi)
  • Class ULS+SLS combi - possibility to select Design ULS (ULS combi) and also Design SLS (SLS combi)
  • Class LC+ULS+SLS combi - possibility to select Design ULS (LC or ULS combi) and also Design SLS (LC or SLS combi)

Export to Allplan

There is a special action button Export reinf. to CAD program in this command. This export is available from version 19.0. The format of the file is version 1.0. After the export the ASF file is generated . This file includes information about:

• 2D member nodes
• 2D Mesh nodes
• 2D Mesh elements
• Information about thickness, material of slab, material of reinforcement, and LCS
• Information about coordinates and required areas of reinforcement

When the Design As is calculated and you press this button program ask you where this file should be stored.

When the Design As is not calculated and you press this button program at first calculate Design As for existing setting of command and then ask you where this file should be stored.

 

There is dependency on Location settings. Export works without any message for Location type In Nodes, avg. and In Nodes, avg on macro. The following messages appear for other cases.

• In centres

• In Nodes, no avg.

When the export is done then the message about number of created file is provided.

Export to ASF respects the actual selection of the 2D members.

In case of subregions the material and thickness of the main slab is exported .

Material of designed reinforcement is exported from Project dialogue or Concrete member data if exists.

Local rotation of the slab (LCS angle) is respected.

Type of exported reinforcement

The export to ASF file depends also on type of reinforcement selection:

The areas are exported based on selection:

• Required - export of required reinforcement is done

• Required (statically) - no export and message appears

  

• Required (additional) - no export and message appears
• 

• Provided - export of provided reinforcement is done