Modeling Features

• Comprehensive CAD-like drawing/editing environment: draw, generate, modify and load elements as well as snap, move, rotate, copy, mirror, scale, split, merge, mesh, delete, apply, trim, extend, etc.
• Versatile drawing grids (orthogonal, radial, skewed, DXF underlay)
• Universal snaps and object snaps allow drawing without grids
• Powerful graphic select/unselect tools including box, line, polygon, invert, criteria, spreadsheet based, save/recall selections with locking
• True spreadsheet editing with cut, paste, fill, math, sort, find, etc.
• Dynamic synchronization between spreadsheets and graphics
• Open multiple spreadsheets simultaneously
• Constant in-stream error checking and data validation
• Unlimited undo/redo capability, automatic timed backup
• Generation templates for grids, disks, cylinders, cones, arcs, trusses, tanks, hydrostatic loads, geodesic domes, etc.
• Support for all units systems & conversions at any time
• Automatic interaction with RISASection custom shape libraries
• Light Gage Shapes: AISI, SSMA, Dale/Incor, Dietrich, Marino\WARE
• Import DXF, RISA-2D, STAAD and CIS/2 files
• Export DXF, SDNF and CIS/2 files
• Robust two-way link with Autodesk Revit 2024, 2023, 2022 & 2021
• Link with Tekla Structures 2023, 2022, 2021 & 2020

Design Codes

• Steel Design Codes: AISC 360-16/10/05: ASD & LRFD, AISC 2nd & 3rd: LRFD, AISC 9th: ASD, CSA S16-14/09/05/01/CSA-S16.1-94, BS 5950-1: 2000, EN 1993-1-1:2014/2005, ENV 1993-1-1:1992, IS 800: 2007/1998, AS 4100-1998, NZS 3404: 1997
• Seismic design per AISC 341-16/10/05, including 358 prequalified connections
• Concrete Design Codes: ACI 318-19 (22)/19/14/11/08/05/02/99, CSA A23.3-14/04/94, NTC-DF 2004, BS 8110-1: 1997, BS EN 1992-1-1: 2004+A1: 2014/2004, EN 1992-1-1:1992, IS 456: 2000, AS 3600-2001, NZS 3101: 1995, SBC 304-2007
• Cold Formed Steel Design Codes: AISI S100-16/12/10/07: ASD & LRFD, AISI NAS-04/01: ASD & LRFD, AISI 1999: ASD & LRFD, AISI 400-15 & AISI S240-15 (Walls), CSA S136-16/12/10/07/04/01: LSD, CANACERO 16: ASD, CANACERO 12/10/07/04/01: ASD & LRFD
• Aluminum Design Codes: AA ADM1-15/10: ASD & LRFD, AA ADM1-05: ASD
• Wood Design Codes: AWC NDS-18/15/12: ASD, AF&PA NDS-08/05/01/97/91: ASD, CSA 086-14/09 Ultimate, Structural Composite Lumber, multi-ply, full sawn, Glulam, shear walls
• Masonry Design Codes: TMS 402-16: ASD & Strength, ACI 530-13/11/08/05/02: ASD & Strength, ACI 530-99: ASD, UBC 1997: ASD & Strength
• Stainless Steel Design Code: AISC 360-10: ASD & LRFD
• Wind loads are generated automatically (ASCE 7-16/10/05/02/98/95, NBC 15/10/05, NTC 2004, & IS 875: 1987) for building-type structures, including partial wind cases
• Seismic loads are generated automatically (ASCE 7-16/10/05/02, CBC 2001, IBC 2000, UBC 1997, NBC 15/10/05, NTC 2004, & IS 1893: 2002) for building-type structures, including accidental torsion

Analysis Features

• Analysis of 1D members (beams, columns, braces, etc.) using Finite Element Method
• Analysis of 2D elements (plates, walls) using Finite Element Method
• Analysis of 3D elements (solids) using Finite Element Method
• Partial fixity member end releases using rotational spring constants
• Simpson Strong-Tie Yield Link as member end releases
• Orthotropic Plate Material
• Time History Analysis
• Accelerated true sparse solver for static analysis
• Accelerated Sparse Lanczos dynamics solver, very fast and robust
• Flexible modeling of P-Delta effects
• Multiple simultaneous dynamic and response spectra analysis using Gupta, CQC or SRSS with automatic calc of scaling factors
• Automatic inclusion of mass offset (5% or user defined) for dynamics when integrated with RISAFloor
• Ritz vector dynamic solver
• True physical member modeling (members are aware of interior joints)
• Plate/shell elements with plane stress only option
• 8 node solid elements
• High end mesh generation — draw a polygon with any number of sides to create a mesh of well formed quadrilateral (NO triangular) elements
• Automatic rigid diaphragm modeling with detachable joints
• Area loads with one-way or two-way distributions with optional “blow through” distribution for loading open structures
• Plate thermal loads
• Simultaneous moving loads, AASHTO/custom for bridges, cranes…
• Torsional warping calculations for stiffness, stress and design of hot rolled steel
• Member end releases, rigid end offsets, analysis offsets
• Enforced joint displacements
• One Way members, for tension only bracing, slipping, etc.
• One Way springs, for modeling soils and other effects
• Euler members: Compression up to buckling load, then disable
• Stress calculations on any arbitrary shape
• Inactivate members, plates, solids and diaphragms without deleting them
• Story drift calculations provide relative drift and ratio to height
• Automatic self-weight calculations for members, plates and solids

Design Features

• Designs/optimizes concrete, hot rolled & cold formed steel, masonry, wood and aluminum
• Program selected or user-defined rebar layouts for flexure and shear
• Concrete beam detailing (Rectangular, T and L).
• Concrete column interaction diagrams
• Concrete wall design including in-plane, out-of-plane & bearing loads
• Automatic spectra generation for ASCE 7, NBC, IS 1893, NTC
• Extensive user controlled generation of load combinations
• Intelligent unbraced length calculations for physical members
• Tapered wide flange design per AISC Design Guide 25
• Masonry wall design for in-plane and out-of-plane
• Wood Shapes: Complete NDS species/grade and Glulam database
• Complete wood wall design for bearing & shear walls: Segmented, Perforated & Force Transfer Around Openings design methods
• Strap and Hold Down design for Wood Shear Walls
• Seismic design of concrete walls using ACI 318-14 Chapter 18
• Concrete seismic coupling beams for multi-story walls with diaphragms
• Capacity-Limited Seismic Design for Special Concentrated Braced Frames (SCBF)
• Buckling Restrained Brace (BRB) seismic checks using CoreBrace elements

Results Features

• Graphic presentation of color-coded results and plotted designs
• Color contours on plates, solid stresses/forces with smoothing and animation
• Spreadsheet results with sorting and filtering of: deflections, forces, stresses, optimized sizes for strength or deflection, code designs, concrete reinforcing, material takeoffs, etc.
• Standard and user-defined reports
• Graphic member detail reports with force/stress/deflection diagrams and detailed design calculations and expanded diagrams

Graphics Features

• Unlimited simultaneous model view windows
• “True to scale” rendering with translucency, even when drawing
• High-speed redraw algorithm for instant refreshing
• Dynamically zoom, pan, rotate, scroll, snap views
• Font and color control
• Saved views to quickly restore frequent or desired views
• Rendered or wire-frame animations of deflected model and mode shapes
• Animation of moving loads with speed control
• Distance tool for measuring between points
• Force/moment summation about any arbitrary cut line
• High quality customizable graphics printing

Integrated Building Design

• RISA-3D, RISAFloor, RISAFoundation and RISAConnection are so tightly integrated that they operate as one program on the same building model. Optimize the gravity system in RISAFloor, the lateral system in RISA-3D, the connection design in RISAConnection and the foundation system in RISAFoundation, with a complete flow of information both ways.
• Integration supported for the following versions: RISA-3D v22, RISAFloor v18, RISAFoundation v16 and RISAConnection v14

General Features

• Compatible with Windows 8.1/10/11 (64-bit Windows)
• Program technical support provided by Professional Engineers