SAP2000 is general-purpose civil-engineering software ideal for the analysis and design of any type of structural system. Basic and advanced systems, ranging from 2D to 3D, of simple geometry to complex, may be modeled, analyzed, designed, and optimized using a practical and intuitive object-based modeling environment that simplifies and streamlines the engineering process. The SAPFire ® Analysis Engine integral to SAP2000 drives a sophisticated finite-element analysis procedure. An additional suite of advanced analysis features are available to users engaging state-of-the-art practice with nonlinear and dynamic consideration. Created by engineers for effective engineering, SAP2000 is the ideal software tool for users of any experience level, designing any structural system. Integrated modeling templates, code-based loading assignments, advanced analysis options, design-optimization procedures, and customizable output reports all coordinate across a powerful platform to make SAP2000 especially useful for practicing professionals. SAP2000 is also an excellent medium for education. Open SAP2000 and follow the Watch & Learn video series to receive not only instruction on software use, but also insight into structural engineering philosophy and practice. Built-in modeling templates, a versatile and user-friendly interface, intuitive controls and features all combine to simplify and expedite a sophisticated object-based modeling process. A broad range of modeling options provide for methods and technologies at the forefront of structural engineering. Model domain may be component, system, or global-level in scope, while encompassing sub-grade components and soil-structure interaction. Grid line, snap, and replication tools are a few of the many practical features which make the modeling environment and process accessible to beginners, and sophisticated for advanced users. Linear or curved members, cables and post-tensioned tendons, link elements to model springs, dampers, isolators, and the associated nonlinear and hysteretic behavior, framing, shell or multi-layered shell, solid elements with isoperimetric formulation and nonlinear response are all modeling options for object assembly in SAP2000. When preferred structural members are not provided in the extensive libraries of SAP2000, Section Designer is available for custom cross-section design. Users specify geometry and material composition before Section Designer automatically calculates member properties and generates biaxial-interaction and moment-curvature diagrams. Nonlinear-fiber-hinge assignment is another advanced modeling technique available. SAP2000 implements code-based or empirical hinging behavior by modeling geometry and materials as discrete points within a cross-section, then correlating these discretized areas with their associated nonlinear behaviors. Limit-state and hysteretic considerations may also be implemented under nonlinear-static and dynamic analyses. Once an object-based model is created, the SAPFire ® Analysis Engine automatically converts the assembly into a finite-element model by meshing the material domain with an efficient network of quadrilateral sub-elements. Joint-interpolation algorithms drive automatic edge-constraint technology to connect mesh mismatch. The Reshaper Tool is then available for mesh reshaping and refinement. SAP2000 is the ideal tool for modeling structural systems of any complexity and any project type. Buildings, bridges, transportation infrastructure, such specialty structures as dams, sports facilities, and offshore systems are a few examples of the limitless design possibilities.