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Command for Code dependent deflection

Calculation Code dependent deflection can be run directly in Concrete tree via command Code dependent deflections (Concrete > Reinforcement check ULS+SLS). This command is visible, if linear calculation is done and if check box Code dependent deflectionProject data is on, see "Setting Project data"

There is possible to evaluate deflection for 1D and 2D in one command and properties in these command are filtered according to, if in the project are only 1D members, only 2D members or both

Group selection

There is possible to select ,which 1D and 2D members will be taken into account for Code dependent deflection and for evaluation of the results. If some selection of members is done, only for this selection non-linear stiffness (reduced stiffness by taking into account cracking and creep), for others members linear stiffness will be used. It follows, that for different selections, different results can be obtained, therefore:

there is new group CDD selection in the header of numerical outputs, where is the list of the members ,which will be used for code dependent deflection is presented
there is note N7/1, if not all members from the structure , are used for code dependent deflection

the code dependent deflection is recalculated, if new selection is done and some selected members are not in CDD selection

List of members from Selection and CDD selection can be different, because for evaluation numerical or graphical output only some member from CDD selection can be selected

Automatic combination

There is supported in version 18.1 only automatic generation of combination for CDD (combination for calculation immediate deflection and deflection caused by creep ) from inputted load case/combination/class defined in subgroup Result case for deflection, see "Combination for CDD"

Group Result case for deflection

Load case/combination or class can be defined in the group, which will be used for calculation code dependent deflection. For automatic generation of combinations from defined results case a special combination for calculation immediate deflection and deflection caused by creep, will be created on the background. There are supported following result cases:

load cases
SLS combination (Linear-serviceability, Envelope-Serviceability, EN-SLS Characteristic, EN SLS Frequent, EN SLS Quasi permanent, )
Classes, which contain load cases or only SLS combinations

Envelope combination is exploded to linear combination on the background.Deflection and FEM analysis is calculated for each linear combination and extreme deflection form all linear combination is evaluated. If number of linear combinations after exploitation from envelope combination is bigger than 10, program gives some warning with time estimation

Type of reinforcement

Three type of reinforcement are supported for code dependent deflections:

required reinforcement -it is reinforcement designed by the program in command Reinforcement design. It is a sum of statically required reinforcement (reinforcement designed for normal forces and bending moments, longitudinal reinforcement designed for tensile force caused by shear and torsion) and reinforcement designed according detailing provisions.
provided reinforcement - it is reinforcement, which is input in Design defaults or Concrete member data via library Provided reinforcement
user reinforcement - it is reinforcement input by the user

Load case/combination/class, which will be used for design required and provided reinforcement, can be defined in group Result case for required reinforcement

type of reinforcement which is used for code dependent deflection is presented in numerical output too. If required/provided reinforcement was not calculated or user reinforcement was not inputted in some sections of 1D members or elements of 2D member, than linear stiffness for uncracked section/element or 10% of linear stiffness for cracked section/element is used and program gives some warning

If the required or provided reinforcement for 1D members is already designed for selected combination in Result case for required reinforcement and selected selection, the designed required/provided reinforcement will be used, otherwise required/provided reinforcement will be designed before calculation of code dependent deflection for selected combination and selection

The required/provided reinforcement of 2D member, which is calculated for Location = In centres and for System = LCS mesh elements is supported for code dependent deflection of 2D members. If the required or provided reinforcement for 2D members is already designed for selected combination in Result case for required reinforcement, selected selection, Location = In centres and for System = LCS mesh elements , the required/provided reinforcement will be used, otherwise required/provided reinforcement will be designed before calculation of code dependent deflection for selected combination and selection.

Group Result case for required reinforcement

Load case/combination or class can be define in the group, which will be used for design required or provided reinforcement, in the case that for selected selection and combination, required or provided reinforcement is not already calculated..This group is visible for Type of reinforcement = Required or Type of reinforcement = Provided. There are supported following result cases:

load cases
ULS combination (Linear-ultimate, Envelope-Ultimate, EN-ULS..., )
Classes, which contain load cases or only ULS combinations

Group Extreme 1D

This group is visible only for project with some 1D members and user can select for which extreme (Extreme 1D) the results for 1D will be presented and in which sections (Results in sections)

Group Extreme 2D

This group is visible only for project with some 2D members and user can select for which extreme (Extreme 2D) the results for 2D will be presented and how will be presented(Standard results, Results on , Results on edges) . Except the fine following parameters can be define:

Averaging of peaks - internal forces and required/provided reinforcement is reduced, if some Averaging strip is defined
Rib - check box if effective width of the slab will be taken into account or not. If the check box is OFF, then deflection of the rib is calculated as deflection of standard 1D member (1D member on eccentricity) which is linked to 2D member. It follows:
- required reinforcement is designed on 1D and 2D member without taking into account effective width of the rib.
- 1D deflection is calculated only for cross-section which is defined in rib properties and for internal forces without taking into account check box RIB
If the check box is ON, then deflection of the rib is calculated with taking into account effective width defined in RIB properties. It follows
- required reinforcement is designed on 1D and 2D member with taking into account effective width of the rib
- 1D deflection is calculated for new cross-section created from rib cross-section (cross-section defined in properties of the rib ) + part of the slab with effective width and for internal forces for 1D member and 2D meshes inside effective width , which are recalculated to centre of gravity of new cross-section
Location - the stiffness and required/provided reinforcement is calculated in centre of 2D elements
System -internal forces and required/provided reinforcement is related to LCS of mesh elements

Direction(local)

There is presented deflection in two directions for 1D member (deflection in y and z direction), but only one deflection for 2D member (z direction). User has three possibilities for presentation deflection of 1D member in graphical output :

z(1D/2D) - deflection in z axis of LCS of 1D member and 2D member is presented
y(1D) - only deflection in y axis of LCS of 1D member and deflection in z axis of LCS of 2D member is presented
both (1D) - deflection in both directions of LCS of 1D member and deflection in z axis of LCS of 2D member is presented

Values

There are presented the following output values in graphical and numerical output:

UC - unity check of check deflection in both direction (y and z) of 1D member and in direction z for 2D member
d_tot - total (long-term)deflection with taking into account cracking and creep
d_tot,lim - maximal (limit) total deflection
d_add - additional deflection
d_add,lim - maximal (limit) additional deflection
d_lin - linear (elastic) deflection
d_imm -immediate deflection
d_short -short-term deflection with taking into account only cracking
d_creep -deflection caused by creep

presentation values of deflection for 1D member (deflection in y or z axis of LCS) in graphical window depends on setting in property Direction (local)

only deflection in z direction of LCS of 2D member is presented for 2D member

Output

There is presented only brief numerical output in version 18.1 with two tables of deflection

deflection for 1D member
deflection for 2D member

There are presented following values in numerical output

d_lin,y(z)	Linear (elastic) deflection in direction of y(z) axis LCS of the member calculated for linear stiffness and defined combination for deflection
d_imm,y(z)	Immediate deflection in direction of y(z) axis LCS of the member after applying permanent and longterm variable load calculated for short-term stiffness and immediate combination
d_short,y(z)	Short-term deflection in direction of y(z) axis LCS of the member with taking into account only cracking calculated for short-term stiffnes and total combination (defined combination in the the Result case for deflection)
d_creep,y(z)	Deflection caused by creep in direction of y(z) axis LCS of the member calculated as difference between deflection calculated for long-term and shorter stiffness for combination for calculation creep deflection
d_add,y(z)	Additional (harmful) deflection in direction of y(z) axis LCS of the member, which is created after applying variable load with taking into account deflection caused by creep calculated. The value is calculated as difference between total and immediate deflection d_add,y(z) = d_tot,y(z) - d_imm,y(z)
d_tot,y(z)	Total (long-term) deflection in direction of y(z) axis LCS of the member with taking into account creep and cracking calculated as sum of short-term and deflection caused by creep d_tot,y(z) = d_short,y(z) + d_creep,y(z)
d_add,lim,y(z)	Maximal additional (harmful) deflection in direction of y(z) axis LCS of the member
d_tot,lim,y(z)	Maximal total (long-term) deflection in direction of y(z) axis LCS of the member
UC	Unity check of additional and total deflection in both directions
Type of reinf.	Type of reinforcement, which is used for calculation of stiffnesses None – no reinforcement , linear stiffness is used Reg. – required reinforcement Prov. – provided reinforcement User – user (REDES, 2D meshes or free bars)
Check	Status of the check
E/W/N	Errors/Warnings/Notes, see SR 1340

Print combination key

Table with combination key (list of load cases with load coefficient ) of Result case for deflection for each table separately(for 1D and 2D member) is presented in numerical output, if the check box Print combination key is switched on. The list of load cases is presented for each dangerous combination (index of combination), which is presented in column Case in table of numerical output.

Print explanation of symbol

Table with explanation of symbol for each table separately(for 1D and 2D member) is presented in numerical output, if the check box Print explanation of symbol is switched on.

Group Errors,warnings and notes settings

There is possible to present errors , warnings and notes, which occurred during calculation, in numerical and graphical output. User can select in this group:

if the errors, warning and notes will be presented in the header of the numerical output (check box Show information about warnings in Result header)
if the explanation of errors, warning and notes will be presented in the numerical output (check box Show table with explanation...)
how the errors, warnings and notes will be presented in numerical and graphical output (properties Show errors, Show warnings and Show notes)

only numerical output of errors, warning and notes is supported for 2D member in version 17.0

The following errors, warnings and notes can occur during calculation of deflection

Index	Type	Description	Solution
W7/1	Warning	The limit total deflection in (y) direction of LCS member is exceeded	To increase dimension of cross-section or to increase area of reinforcement (manually or by using Coefficinet for increasing amount of reinforcement defined in Concrete setting or concrete member data)
W7/2	Warning	The limit additional deflection in (y) direction of LCS member is exceeded.
W7/3	Warning	The limit total deflection in (z) direction of LCS member is exceeded
W7/4	Warning	The limit additional deflection in (y) direction of LCS member is exceeded.
W7/5	Warning	The linear stiffness was used for the calculation, because section is uncracked and there is no reinforcement	To change type of reinforcement, which is used for calculation, or to design required or provided reinforcement or to input user reinforcement
W7/6	Warning	Only 10% of the linear stiffness was used for the calculation because the section is cracked and no equilibrium had been found	To increase dimension of cross-section or to increase area of reinforcement (manually or by using Coefficinet for increasing amount of reinforcement defined in Concrete setting or concrete member data)
N7/1	Note	Nonlinear stiffnesses are calculated only for some members (CDD selection),so for different CDD selection, the deflections can be changed	To use all 1D and 2D members for CDD calculation
E09	Error	Rib is not supported, the linear stiffness was used for the calculation

The value of unity check is loaded from Concrete setting (value Ncal.check), if errors is occurred during the calculation

Except errors/warning and notes above, two special warning can be appeared before running of calculation:

warning about number of combinations, which is used for CDD calculation

warning about number of 1D elements

Group Drawing setup 1D

The user can set how will be presented result for 1D members in graphical window in this group

Group Drawing setup 2D

The user can set how will be presented result for 2D members in graphical window in this group

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