4M Strad

STRAD is a unique tool for Structural Analysis and Design of 3D Concrete Frames. It has a friendly 3D CAD environment based on 4MCAD, a powerful finite element analysis engine performing both static and modal (eigenvalue) analysis and a reliable design module for concrete members, highly customizable to accept parameters of the seismic code of your choice.

Click on the video below to view the demo

STRAD software is a complete and reliable design tool for reinforced concrete structures. It combines the scientific completeness, proved by a volume of papers, in Hellenic and international sessions, the speed derived from advanced computational and programming techniques, the easy of use with many automations that help to quickly input the design study data and the auto-solving by pressing of a button. The program is addressed to engineers demanding correct simulations and solutions by providing them with all-powerful tools, as well to those working on usual projects and wishing to quickly and safely reach to the final drawings production.

One of the top features of STRAD is the possibility to select the most convenient CAD platform that best serves users' demands. The program allows for importing a finished plan drawing created by any architectural design tool, in the form of *.DWG or *.DXF files, and of course, from the IDEA architectural program of 4M. The model processing is executed graphically by using AutoCAD commands, whilst the structure can be represented in 3D with shadows and photo-realism.

STRAD's philosophy is the free access of the user to the majority of analysis and design parameters. The engineer may follow the auto program flow for simple structures analysis, whilst, for complex ones, may interfere in all stages. The program provides for all required checking and documentation of the solutions. The results (stresses, deflections, reinforcements, moment envelops ea.) are graphically displayed and printed to file or printer for all building elements.

Also, the program automatically modifies all geometry data and results (reinforcing bars and their positions) to a finished drawing in AutoCAD form. The possibility to create preliminary studies, final ones and application drawings (plans, sections, column details, beam reinforcement schedule) also exists.

The computational core of STRAD expands with the finite element analysis program (FEA), which automatically discriminates the plane parts of the structure into plane finite elements and solves them (perimeter underground walls, building cores, slabs). This way, the structural engineer can achieve a high standard solution of complex structures. The finite elements net can be easily modified in the AutoCAD environment to describe voids in structure. Also, the possibility for designing of load-bearing masonry, according to Eurocode 6, that has been described and solved by STRAD, exists.


Easy to use

As mentioned above, STRAD is based on AutoCAD’s powerful graphic engine. Any existing architectural drawing (dwg or dxf) can be used for defining the building faster. Using advanced commands (snaps, relative movements, coping entities or whole levels) and reproducing any 2D or 3D building view, STRAD is considered as the friendliest CAD environment. Even large buildings with complex frames can be entered with great ease. Moreover a photorealism-walkthrough module is available for creating high quality photorealistic images and "walking" inside and outside the construction.

Advanced modeling

STRAD offers the capability of modelling and analysing any RC Structure from multi-storey buildings to complex 3-D structures. Its element library consists of 3D beams and columns having rigid offsets, circular and polygonal columns (up to 7 orthogonal parts), inclined beams and columns, shear walls, inclined slabs and slabs with openings, masonry walls, strip foundations, auxiliary members and kinematic constrains.


STRAD can be upgraded using the module of Finite Element Analysis (STRAD FEA). In such a case shear walls and slabs can be modelled using shell finite elements having 6 degrees of freedom per node. Finite element mesh is generated automatically, but the user can easily modify it i.e. to describe openings. STRAD’s loading cases include dead loads, live loads, nodal forces, uniform loading and temperature stresses. Loading cases are combined according to EC1. The user can also define his own load combinations.

Analysis - Concrete Design

STRAD supports static analysis and modal eighen value analysis. The program offers an interactive member design process (back analysis). The process is highly customised to accept parameters according to any seismic code (such as EC2 and EC8). There is a variety of “material libraries”, that include hundreds of parameters for the analysis and the design (such as Characteristic cylinder strength of concrete, Design yield strength of reinforcement, Design yield strength of shear reinforcement or torsion links, Partial safety factor for concrete material properties, Partial safety factor for permanent action or dead load, etc) that can be modified. In addition, a module for building retrofitting is available.

Final Drawings – Results Overview

STRAD produces formwork plan and member detailing drawings in Autocad’s native file format (dwg) and an incredibly detailed report in modern rich text format! The user has the overall overview of the results at every step of the program. STRAD can print on screen the deformed shape of the model, eigenmodes animation, member results and stresses and reinforcement.

By summarizing, STRAD is an autonomous, productive tool for any Engineer. It can be easily used to analyse and design any type of RC structure offering the most reliable methodology based on the most modern techniques and standards. Its scientific background is verified with many announcements at European and International Conferences and Magazines.

Extensions of STRAD

CAD: Automatic Generation and Editing of Blueprints, DXF export options
DOK: Automatic Generation and Editing of RC Beams Design Layouts, DXF export options available
PROM: Reinforcement Bar Lists (Detailed Spreadsheets)
TOIXOP: Design of Bearing Members according to EC6 (Implementation of EC 6 requirements to bearing wall members of a 3D RC Frame Structure)
AP: This software uses specially designed wizards to guide through the procedure of crack network identification in RC members exposed to seismic activity, classifies damaged members and suggests solutions to meeting the appropriate Code's requirements
SMART: Expert System of Model Definition. This program performs preliminary checks of model's overall behavior under predefined load conditions in order to provide the best solution among four alternatives


VK. FEA Finite Elements Analysis of 3D Frame Structures

Extensive Shell and Beam Element Library, Various Options of Mesh Generation available


Other Related Packages

Shell Design using Finite Element Analysis, (Pools, Tanks, Swimming Pools), Various Options of Mesh Generation available, Automatic Generation of Blueprints, DXF export options

Design of Retaining Walls

Finite Element Analysis and Design of Bearing Walls according to EC6


Get Connected

6twitter logo Facebook Logo in




Google Plus