SeismoStruct is a Finite Elements package capable of predicting the large displacement behaviour of space frames under static or dynamic loading, taking into account both geometric nonlinearities and material inelasticity. Some of its analytical features are:

• 7 Analysis Types, such as Pushover Analysis, Nonlinear Dynamic Analysis, Incremental Dynamic Analysis, Displacement-based Adaptive Pushover, etc.
• 8 Element Types, such as nonlinear fibre beam-column element, nonlinear truss element, nonlinear infill panel element, nonlinear link elements, etc
• 11 Material Models, such as nonlinear concrete models, high-strength nonlinear concrete model, nonlinear steel models, FRP-confined nonlinear concrete model, SMA nonlinear model, etc
• 16 hysteretic models, such as linear/bilinear/trilinear kinematic hardening response models, gap-hook models, soil-structure interaction model, Takeda model, Ramberg-Osgood model, etc
• 3 different solvers; Frontal, Skyline Iterative, Gauss-Seidel

In addition, SeismoStruct is also characterised by a number of important usability features, such as:

• full integration with the Windows environment. Input data created in spreadsheet programs, such as Microsoft Excel, may be pasted to the SeismoStruct input tables, for easier pre-processing. Conversely, all information visible within the graphical interface of SeismoStruct can be copied to external software applications (e.g. to word processing programs, such as Microsoft Word), including input and output data, high quality graphs, the models' deformed and undeformed shapes and much more.
• with the Wizard facility the user can create regular/irregular 2D or 3D models and run all types of analyses on the fly. The whole process takes no more than a few seconds.
• real-time plotting of displacement curves and deformed shape of the structure, together with the ability of pausing and re-starting the analysis.
• deformation-based performance criteria can also be set, allowing the user to identify the instants at which different performance limit states (e.g. non-structural damage, structural damage, collapse) are reached. The sequence of cracking, yielding, failure of members throughout the structure can also be, in this manner readily obtained.
• advanced post-processing facilities, including the ability to custom-format all derived plots and deformed shapes, thus increasing productivity of users.
• AVI movie files can be created to better illustrate the sequence of structural deformation.

A fully working version of the program may be downloaded from here.