• Enhanced tools that provide native integration between VISOR-SAPR and SAPFIR.
• Greatly enhanced technology for generation of design models and evaluation of analysis results.
• In VISOR-SAPR module it is possible to define input data and evaluate output data for the analyses in FEM solver and design modules.

• In addition to previous options to automatically collect wind load, generate pulsation loads, assign earthquake load and generate moving load, LIRA-SAPR 2020 introduces new options to automatically define snow mound, ice load, create soil pressure on the walls in basement. Enhanced options to generate the wind load: generate loads according to Eurocode EN 1991-1-4: 2005 and NP 2.2.1 to the SP RK EN 1991-1-4: 2005/2011 . New option to automatically collect loads from floor slabs to beams.
• Triangulation becomes faster due to multithreading and developed principle of dividing large domains (large floor slabs) into subdomains.
• Improved triangulation: the user could modify triangulation mesh based on preset triangulation lines as well as convenient automatic tools that enable the user to make the mesh dense at support zones.
• One more step has been taken to create a complete design model without VISOR-SAPR module. Now the user could define certain FE (including specific ones) either automatically or manually. It is also possible to preview and evaluate the output data in the SAPFIR environment. Thus, you can send the design model to the SOLVER (for analysis) and then evaluate certain output data without VISOR-SAPR module.
• New nodes in Generator: Block of models, Generation of strip foundation; Generation of partitions, Generation of grid lines; Import of IFC models.
• In addition to the previous systems Slab, Diaphragm, Column, Beam and Dowels from the base plate, Design of RC structures introduces the new option to design the straight RC stairs.
• Enhanced options to define joints and more options to compute stiffness of the joint in the Large Panel Buildings module.

High-precision (with nodes at the sides) linear FE (plates and solids) that provide more exact solution even when sparce FE mesh is used.

The sixth degree of freedom (DOF) for FE of shell - rotation about the axis perpendicular to the plane of plate; it enables the user to improve quality of the FE model in solving certain problems (e.g. to simulate mass eccentricity, to avoid geometric instability, etc.) without special tools for simulation.

To solve dynamic problems with the spectrum method, an algorithm of mass condensation is implemented; it can significantly reduce the time to search for mode shapes. In this approach when mode shapes are searched for, only masses of the main structure are considered, while masses from the flexible part (for this problem the user is not interested in natural vibrations of this part) are concentrated at the common nodes.

Iterative FE of the platform joint; they enable the user to carefully take into account behaviour of the joint (eliminated in uplifting, more exact options to edit the shear stiffness, etc.)

Other enhancements that enable the user considerably extend options to solve linear problems.

• The new version presents an alternative algorithm for analysis of masonry reinforcing structures in strict compliance with SP 15.13330.2012 (amendment No.3). Appropriate setting is placed in set of properties for design options. New user interface has been developed to describe the design parameters of masonry and mesh reinforcement. Reinforcement with composite mesh may be analysed.
• Enhanced analysis of piers with arbitrary cross-section. The area of compressed zone of the section is determined according to the deformed shape.
• Enhanced analysis of piers with account of strengthening the reinforcement with a steel casing, RC casing and reinforced plaster. The strengthening is calculated according to the Manual on Design of Masonry & Masonry Reinforcing Structures to SNIP II-22-81 (chapter 5).

• In bar and plate elements, analysis of transverse reinforcement (required area) in fire resistance is provided.
• Analysis of reinforcement in the middle of the element is important for 3D volumetric construction (very thin wall with central reinforcement).
• For pilot reinforcement (PR) types assigned to elements, reverse factors for reinforcement are computed by 5 different check procedures.

• Analysis of an I-beam with variable cross-section is introduced. The algorithm for selecting cross-sections is based on the condition of obtaining min possible profile in terms of material consumption. All cross-sections within the structural element retain linear relationship between dimensions of the sections at the beginning and end of the bar. Output data for the selection of sections indicating the utilization ratio for each check is presented in graphical and tabular forms.
• The set of cross-sections available to check and select thin-walled shapes according to SP 260.1325800.2016 is extended.
• In the local mode, characteristic combination of forces is also displayed for evaluation (this combination has made the max contribution for each of the checks).
• The speed for selection and check of steel sections is increased due to optimization of analysis algorithms.

For bar-like elements (piers, partitions, pylons, etc.) that are simulated by a set of FEs in the general design model, it is possible to define the corresponding bar element, determine the forces acting in it and transmit it for further design procedure (analysis of reinforcement in RC element , analysis of the cross-section of the steel element).

The 'progressive collapse' process may be simulated. The stress-strain state (of the whole structure) 'preceding collapse' is the initial one for subsequent options to delete the destroyed elements.

Dynamic component of load from the removed element may be taken into account either by the specified dynamic factor or by applying an impulse load during time history analysis.

• Documentation system 'Report Book' supports all new options of LIRA-SAPR 2020.
• In the 'Report Book' there is a new option 'Restore model by volumes' similar with settings for the image update.