Computer - aided design (CAD)
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SP LIRA 10

«LIRA 10» software package is a whole new level of tools for computational studies of strength, dynamics and stability of the structures.
Intuitional user interface
It includes the up-to-date graphics technologies, which allows to use all computer's capabilities, so design model generation is significantly speed up.
Positioning and preview increase intuitiveness and expand user abilities during design model creation, problem monitoring and diagnostics.

All modules of program complex: assenblage, dynamics+, soil, structural design systems, cross sections designer, documentation system, results analysis and control, etc. are operating in united integrated environment, which allows to significantly reduce time spendings during model creation and report generation. Object data model is always ready to any changes, additions and modifications.
Finite element library
Allows to create computer models of virtually any structures.
Along with traditional for LIRA AS types of finite elements, there were implemented two- and tree-dimensional finite elements with nodes in the middle of edges, which allows to significantly increase solution accuracy. There was implemented bar of variable cross section, with included consideration of sectorial moment of inertia.
Physical nonlinearity
Has been implemented based on various nonlinear relationships δ - ε, providing the opportunity for computer simulation of loading process
of mono- and bimaterial structures, with tracking of crack development, yield and creep strains development, up to obtaining the fracture pattern of the structure.
Powerful multifunctional computational processor
Significantly accelerates computational process on multicore computers and on 64-bit computer system in linear and nonlinear formulations.
Methods of variables renumbering, that are implemented in the processor, combined with untilization of multiprocessing allow to significantly reduce solution time of large-scale problems. Processor has got an extensive system of input data control and errors diagnosis. There was implemented an interactive work of computational processor, which allows to quickly identify and correct errors in design model, that were detected at the calculation stage.
Structural design systems
Structural design systems allow to design steel and reinforced concrete structures.
There has been provided the possibility to operate in mode of predetermined steel cross sections and reinforcement checking, as well in the mode of design of required cross section of steel elements and required area of reinforcement of reinforced concrete elements.

Design results of structural design systems are represented as tables, mosaics, diagrams and isofields. Calculation report for given element can be obtained symbolically and with substituted the values, which allows to cross-check obtained results.
Geometrical nonlinearity
Consideration of geometrical nonlinearity allows to perform evaluation of originally stable structures (slender plates and beams, slender trusses, etc.),
and substatic ones (cables, cable-stayed trusses, cable-stayed roofs, tents, membranes, etc.), and for their analysis equilibrium shape for specified load has to be determined.
Documentation system
Documentation system is a full set of document patterns with standard contents and plugged in hints regarding its filling in, sorted hierarchically.
It's intended for evaluation of calculation results (tables with an option of indicating and marking on the model, histograms and high-definition images of fragments of the structure), and for generation of a walk-through report by the user, which is filled with table data, images and text.

There was implemented a report output in analytical form upon all limit states for checking and design of steel structures.
«LIRA 10» program complex» is a brand new system, that brings all needed tool kit for design engineer without additional satellite applications, and, naturally, without additional spendings.
ASSEMBLAGE module
Allows to track state of stress of the structure during its erection process, repetitive change of design model, mounting and removal of temporary supports, etc.
This module also allows to perform computer simulation of erection of hi-rise buildings made of insitu reinforced concrete considering varying stiffness and concrete strength, initiated by freezing of a cast mixture or other factors.
SOIL
Allows to set geological conditions of construction site for consideration of interaction between the structure and foundation soil.
By set geological conditions, the automatic generation of soil model under designed building is performed, with further evaluation of bedding values. There was implemented an opportunity to convert bearing reaction of soil into soil loading for adjustment of bedding values. After applying bearing reaction of soil as a loading for re-calculation of bedding values, the information, regarding load change in percentage and change of centre of force, is shown.
BRIDGE
Allows to construct the influence surfaces, assign arbitrary motion paths of moving loads,
determine enveloping forces due to moving loads and combination of forces due to static and moving loads.
DYNAMICS+ module
Allows to perform structural analysis of any complexity for various dynamic actions in time, including consideration of nonlinearity.
Analysis can be carried out for accelerograms, seismograms, explosion and other dynamic actions.
VARIATION OF MODELS
Allows to combine the results of several design models with identical topology.
Results merging can be performed at a level of unification of already computed DCF and at a level of merging of computed internal forces and displacements due to loadings in different problems, with further evaluation of DCF and DCL. Resultant DCF and DCL can be used for calculation in structural design systems. In terms of single analysis it allows to variate not only the load (traditional analysis), but also stiffness properties and boundary conditions, etc.
PUSHOVER Analysis
Is used for evaluation of structure behavior under seismic actions beyond elastic limit
This method connects bearing capacity spectrum and seismic requirement given as a response spectrum. Intersection point of bearing capacity curve and response spectrum curve - dynamic equilibrium - is evaluated and it's used for evaluation of expected behavior of the structure.
Integrated computational environment is a main concept in development of a new program complex, therefore LIRA 10.x has been created with an aim to significantly surpass previous versions. The whole program code of main components has been written «from scratch» and it's one of the main advantages of LIRA 10.