The following options and features are updated: SP 63.13330.2018, SP RK EN 1992-1-1:2004/2011, TKP EN 1992-1-1-2009, SP 16.13330.2017, SP RK EN 1990:2020+1:2005/2011, input tables, .saf, .ifc, piecewise linear diagram, option to select group of forces, types of pilot reinforcement (PR), option to replace stiffnesses, time history analysis, total coefficient, collection of masses, piers, option to unite loads, dead weight, loads per r.m., nonlinear stiffnesses, super-elements, analysis on specific/emergency loads, ultimate deflection, beam-to-column connection, rigid column base, joints from rectangular pipes, P-delta effect, account of slenderness ratio, pylon, fire resistance analysis, Report Book, DCL, FE of soil, bar analogues, new steel tables in Local mode for analysis of steel structures, Cross-section Design Toolkit module.

December 24, 2020

The third release (R3) of LIRA-SAPR 2020 is available now.



  • Corrected options to create and edit the opening in the wall if 'Invert' option is defined for 'Orientation'.

  • Enhanced option to correct location of the opening by line into walls if the generation of opening was cancelled with Esc button.

  • Enhanced option to generate PRB in cases when parameter 'Search for intersections' (accuracy) several times greater than parameter 'Unions' (accuracy).

  • Enhanced option to generate PRB for walls.

  • New option to automatically update model after 'end cleanup' is cancelled.

  • Corrected error in generation of punching shear contours below the floor slab level.

  • For the SP RK EN 1992-1-1:2004/2011, default parameters for generation of punching shear contours are modified, k=2.

  • Enhanced option to determine the plate thickness if the 'Plate' option if defined as analytical interpretation of the beam.

  • New option to automatically update analytical model of inclined slab when the slab is modified through the control points.

  • Enhanced option to define the earthquake by SP 14.13330.2014/2018 (56).

Large panel buildings

  • New option to save initial length of the axial line of the wall when joints are generated.

  • Enhanced tool to automatically generate joints ('Apply' command, 'Precast concrete' dialog box).

  • Corrected behaviour of the horizontal joint for the case when in the opening in wall parameter 'Vertical lines of triangulation' is defined.

  • Enhanced option to generate intersections in the meshed model for the special elements of springs.


  • Enhanced option to generate block of nodes.

  • Enhanced arrangement of nodes on the canvas for the 'Unite/Split block' commands.

  • New option to snap the lower level of walls and columns to the intermediate level of the storey.


  • Input tables:

    • corrected option: sign for the unification angle (relative to the local X1-axis of the plate) in the input tables 'Local axes of plates' and 'Axes of orthotropy for plates' in some cases of orientation for plates;

    • clarified column headings for the input tables 'Local axes of plates' and 'Axes of orthotropy for plates'.

  • For import from SAF, enhanced option to recognize the level for analytical model of slabs.

  • New option to import capitals from the IFC file.

  • Enhanced recognition of openings in prisms when IFC file is imported.

Unified graphic environment VISOR-SAPR

  • New option to automatically generate nonlinear stress-strain diagrams for the main material (concrete) and reinforcement according to the data defined in analysis of RC structures. In earlier versions, nonlinear diagrams were presented with combination from 11/15 exponential diagrams for reinforcement and concrete. Now it is possible to flexibly manage the process of diagram generation:

    • to select the diagram 11/15 (exponential) or 14 (piecewise linear);

    • to select the DCF group for which the further analysis of A1, B1, C1 and D1 should be carried out. Rules for generation of material diagrams depends on the purpose of analysis, namely: to determine values for max stress and relative strain;

    • when the diagram is generated, all necessary partial safety factors defined in material for RC structures are considered;

    • in the comment to the diagram, there is a description, e.g. B25 group D1, that is, material properties for concrete class B25 are used in the diagram with all necessary set of partial safety factors for the strength analysis on specific/emergency combinations;

    • new option to generate nonlinear problem even if there is no unification of reinforcement. In earlier version it was mandatory. Types of pilot reinforcement (PR) may be used as reinforcement in nonlinear analyses.

Option to replace stiffness by data from analysis of RC structures
Option to replace stiffness by data from analysis of RC structures
Design model with the generated nonlinear stiffness according to the data from analysis of reinforcement
Design model with the generated nonlinear stiffness according to the data from analysis of reinforcement
  • Corrected option to open analysis results for the problems with time history analysis if the problem has more than 1000 check time points.

  • Corrected option to generate the text file with the list of elements in cases when the list contains deleted elements.

  • IMPORTANT. In release R3 there is a new option to take account of total coefficient to stages when masses are collected in order to carry out dynamic analysis by method of decomposition by natural mode shapes of vibrations as well as time history analysis. To take into account the total coefficient to stages, select appropriate option in the 'Model nonlinear load cases' dialog box. Masses are not collected for the additional load cases defined to assemblage stages.

  • Corrected error in presentation of icons and colour markers in the 'Stiffness and materials' dialog box when you work with Windows fonts of different scales.

  • In the 'Define and edit types of pilot reinforcement (PR)' dialog box, when the 'generate PR types by reinforcement palette' option is active, corrected error that caused increase in area of one rebar (as multiples of number of rebars).

  • Enhanced algorithm for auto division into rectilinear groups of piers if the precision for model geometry is specified.

  • Corrected option to unite loads when two triangular plates are united into quadrilateral one and the situation when loads are copied with the 'Information about node or element' tool.

  • For modal analysis, new option to display mosaic plot with weights of masses.

  • Enhanced control when the dead weight is assigned at assemblage stages; the weight assigned earlier in other assemblage stages is removed. This rule is not applied to the after-stage load cases.

  • Corrected option to display the load values per r.m. in case the group includes elements with modulus of elasticity equal to zero.

  • New option to automatically update the current palette for mosaic plots with subgrade moduli, pile stiffness, bearing capacity, in case the input data is modified and the data is computed once again.


  • Corrected error that caused inaccurate generation of data for the nonlinear stiffness.

  • Restored option to define the pack precision for nodes and arrangement precision for super-elements (SE).

Arrangement precision for super-elements.png

Arrangement precision for super-elements

Steel Structures

  • In tables of analysis results there are warnings for the case when incorrect combinations of steel and appropriate thickness are used in check/selection of sections.

  • For the elements of 'truss' type, new option to define the partial safety factor for analysis on specific/emergency combinations.

  • For the elements of 'beam' type, new option to manage the ultimate deflection in analysis on specific combinations. In earlier versions, this value was accepted by default as equal to 1/50L.

  • Modified work with the 'Forces' dialog box in the local mode for analysis of joints and elements.

  • In analysis of beam-to-column connection:

    • modified algorithm to select number of bolts along the height of the beam web, fixed joint with angle and with plate;

    • modified length of angle, pinned joint with angle and fixed joint with angle;

    • initial distance between bolts across the action of transverse forces is accepted as min (1.3*D, where it is possible, earlier it was accepted as equal to 1.5*D);

    • clarified option to determine partial safety factor for the bolted joint Yb according to the table 41 SP 16.13330.2017.

  • In analysis of rigid column base, corrected error that occurred when the base is pulled out (uplifting) and in the presence of specific/emergency combinations, the error referred to an incorrect determination of design resistance of bolts.

  • In analysis of truss joints from rectangular pipes, enhanced algorithm to determine slope angle of elements included into the joint for the case when geometry is transferred to the local mode of analysis of the main model.

  • Modification in analysis of steel structures according to N3:

    • clarified how the structural deformation influences internal moments in columns (P-delta effect);
    • corrected utilization ratio for the cross-section in analysis on compression.

Reinforced Concrete Structures

  • For the building code SP 63.13330.2018:

    • for statically determined structures, corrected option to take account of random eccentricity;
    • when the slenderness ratio is considered, clarified analysis of stresses from the long-time part of loads;
    • when analysis type 'pylon' is used, in bar elements account of slenderness ratio is corrected;
    • corrected option to select forces for fire resistance analysis;
    • added option to apply partial safety factors for concrete of arbitrary class in analysis on specific/emergency combinations;
    • updated design parameters of steel class A400.
  • For the building code SP RK EN 1992-1-1:2004/2011:

    • the effects of the deformed geometry (second-order effects) were recovered;
    • when materials are defined for analysis, by default, coefficients from the National Annex are used.
  • Corrected error when computing K by strength for the building code TKP EN 1992-1-1-2009.

Documentation system

  • Corrected option to generate the input data tables for the large problems.

  • Corrected option to generate the input data tables 'Reinforced concrete'.

DCL (design combinations of loads)

  • For the building code SP RK EN 1990:2020+1:2005/2011:

    • when the input data for the DCL table is defined, it is possible to indicate which loads were defined in the design model design values or normative ones;
    • when several standard combinations of loads are added, in the DCL name there will be a label that indicates whether this combination belongs to a certain group of combinations (I-VII);
    • corrected option to generate specific/emergency load cases.
  • IMPORTANT. Sect.4.29 is taken into account according to requirements of EN8. Bending moments at the joints of structural elements of beams and columns are corrected for the whole earthquake combination, rather than only for the forces obtained from the earthquake load. This requirement is also considered in analysis by quasistatic method when inertial forces from the earthquake load are defined as the input data, that is, as the load on nodes and elements of the model.


  • Corrected error in extrapolation of soil model; the error caused application instability.

  • Corrected triangulation procedure when 2D FE of soil are generated.

Bar analogues

  • Clarified calculation of forces in bar analogues for the type of section 'angle'.

  • For the short part of wall, enhanced option to determine angle of pure rotation when bar analogues (BA) are generated.

SRS-SAPR (steel rolled shapes, steel tables)

  • New steel tables of local steel structures mode according to ST 02494680-073-2020:
    • C-shaped 'Akfabuid';
    • Channel sections, steel bent equal-leg 'Akfabuid';
    • Z-shaped 'Akfabuid'.

Cross-section Design Toolkit

  • In the 'Sectional view' dialog box, new option to indicate dimensions and display values on diagrams.


Cross-section ( dialog bo 'Sectional view')

  • Enhanced work with dialog boxes 'Hatching', 'Texts'.

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