What are the key features to look for in a structural analysis tool for seismic design?

In my opinion, I think the GUI is the most important key feature since all Finite Elements Analysis tools possess the same analysis techniques and algorithms. And also all these software contain the relevant codes. It is also important to mention that the user judgement on the results is the most important part of work which makes all software are technically the same. So the more user-friendly the software is, the better the design experience.

When selecting a structural analysis tool for seismic design, key features include nonlinear analysis capabilities, soil-structure interaction, accurate seismic load modeling, comprehensive material models, and performance-based design tools. Look for an advanced element library, pushover analysis capability, and support for various seismic codes. Ensure the tool has an intuitive user interface, robust visualization, and compatibility with BIM software. Finally, validate the tool's reliability through extensive validation and verification documentation.

Key Analysis Methods: Linear Static, Linear Dynamic, and Nonlinear Dynamic analyses are fundamental for assessing a structure's behavior under static, dynamic, and large displacement loads, respectively. Critical Analysis Techniques: Time-History Analysis evaluates a structure's reaction to actual/synthetic ground motion records, while Response Spectrum Analysis assesses its response to different earthquake scenarios. Versatility and Flexibility: The ability to switch between analysis methods allows experts to apply the most appropriate technique for the seismic scenario at hand.

Key seismic design analysis methods include linear static analysis using equivalent static loads, linear dynamic analysis through modal or response spectrum analysis, and nonlinear static (pushover) analysis for progressive collapse evaluation. Nonlinear dynamic analysis simulates real earthquake events via time-history analysis. Response spectrum analysis assesses maximum response using predefined spectra, while incremental dynamic analysis (IDA) evaluates performance under increasing seismic intensity. Performance-based analysis ensures designs meet specific criteria under varying seismic conditions.

Key aspects of material modeling in seismic design include representing nonlinear stress-strain relationships and degradation models for stiffness and strength under cyclic loading. Detailed hysteresis models capture energy dissipation, while material anisotropy accounts for direction-dependent properties. Fracture and fatigue modeling addresses the mechanics and life expectancy of critical components, and temperature effects are considered to evaluate changes in material properties during seismic events. These factors ensure accurate and reliable material behavior predictions under seismic conditions.

Key aspects of load application in seismic design include applying seismic loads using response spectra or time-history data, and incorporating gravity loads (dead and live). Wind loads and dynamic loads from moving objects or machinery are also considered. Thermal loads account for temperature-induced expansion or contraction. Various load combinations specified by design codes are applied to ensure a comprehensive analysis, capturing the interaction of different forces acting on the structure during seismic events.

Result interpretation in seismic design involves assessing maximum and residual displacements, inter-story drifts, stress and strain distributions, and modal analysis for natural frequencies and mode shapes. Analysis includes evaluating base shear, overturning moments, and identifying plastic hinge formation to understand potential failure mechanisms. Performance levels are checked to ensure the structure meets predefined objectives under different seismic intensities. This comprehensive interpretation process ensures that the structure's behavior and performance are thoroughly understood and meet safety and performance requirements.

I guess, following the codes and guidelines is a must. All the other features like building modelling, load combinations, analysis of the structures, result interpretation etc. are a part of the code compliance.

Code compliance in seismic design involves ensuring that structural designs adhere to relevant building codes and standards established by regulatory bodies. These codes specify minimum requirements for seismic resistance, detailing guidelines, and performance criteria. Key aspects of code compliance include understanding and implementing provisions related to seismic design parameters, such as seismic zones, site-specific ground motion characteristics, structural system types, material properties, detailing requirements for seismic-resisting elements, and performance-based design criteria. Adhering to these codes ensures that structures are designed and constructed to withstand seismic forces and protect occupants safety.

Transparency, good documentation, examples and an active community. Choose any two! Structural software packages are incredibly complex and it's not easy to create good documentation. I've had mixed experiences with workshops and courses for specific commercial software packages. The Pynite project on GitHub is an excellent example of what's possible with good documentation and transparent code. And it's free.

When choosing a structural analysis tool for seismic design, ensure it complies with relevant seismic codes (e.g., Eurocode 8, ASCE 7, IBC) and offers dynamic analysis capabilities, such as response spectrum, time-history, and pushover analysis. It should include a comprehensive library of materials and elements, allow for detailed 3D modeling, and automate seismic load generation. Key features include soil-structure interaction consideration, support for base isolation and damping systems, performance-based design, advanced visualization, and a user-friendly interface. Additionally, ensure it integrates with other software and offers strong documentation and support, ensuring accurate and efficient seismic analysis and design.