Released 14-Aug-2023

Release Notes



Several enhancements have been made to the handling of time-history and response-spectrum functions:
  • ∙ The processing of large function files, such as wind records, has been made more efficient for speed and storage.
  • ∙ Functions can be added or modified after the analysis is run and the model is locked.
  • ∙ More control has been given to locating function files on the local computer or network.



Parallelized design and response-recovery have been made more efficient for speed, memory usage, and disk IO for large analysis models and/or models with many long time-history functions, such as wind records. Parallelized response recovery affects certain larger output tables and time-consuming graphical displays.



Crack-width (serviceability) design of concrete members has been added according to Eurocode 2-2004 and Italian NTC 2008 codes. This feature is available for beam (M3) design and for the design or check of column reinforcement. Crack width, concrete stress, and steel stresses are calculated and compared against the limits imposed by the Eurocode 2-2004.



An enhancement was made to show PT tendon vertical profiles in slabs and beams in Detailing drawings. Previously the PT profiles were shown in the on-screen Detailing, but not in the drawing sheets produced for printing and/or export.

Bug Fixes


Issues reported by users have been corrected.

21.0.0 | 21.0.1

Released 11-May-2023

Release Notes



Detailing of concrete and steel structures, as well as the production and management of schematic design drawings, is now available from a new Detailing menu inside ETABS. It can now handle multiple towers as well.


Detailed reinforcement from beams, slabs, column stacks, and wall stacks can now be exported from ETABS to Autodesk® Revit® through the CSiXRevitTM 2023 plugin to Revit 2023.

Structural Model


Tributary PT tendons are now accounted for in finite element-based design of slabs and cracked-slab deflection analysis (short- and long-term).



Auto-wind load, auto-seismic load, and response-spectrum function based on NBCC 2020 have been added.


Auto-wind load, auto-seismic load, and response-spectrum function based on ASCE 7-22 have been added.


Loads assigned to null lines and null areas applied in any local or global direction are now transferred to the underlying structural floors. In earlier versions only loads in the gravity direction were transferred.



AS 4100:2020 steel frame design has been added.


Eurocode 4-2004 composite column design has been added.

Output and Display


Cracked-section modifiers for beam and floor objects are now included in the database tables.


Nonlinear shear-material state and status output for general wall hinges is now available in the database tables, deformed shape display, and performance-check output.

Database Tables


Performance-check definitions can now be edited when the model is locked and selected for associated tabular output.

Application Programming Interface (API)


Support for .NET 6 has been added including a help topic in the "Key Concepts" folder.

Bug Fixes


Issues reported by users have been corrected.


Released 25-Jul-2022

Release Notes

Bug Fixes


Issues reported by users have been corrected.


Released 1-Jul-2022

Release Notes

Structural Model


The "Specified Rebar Layout" rebar option for wall hinges now allows the option of assigning the rebar in a Pier orientation or a Spandrel orientation.


The exponential and bilinear viscous-damper link properties have been enhanced to add a Fixed Length Damper option for the axial degree of freedom. When enabled, this allows a fixed-length damping device to be modeled together with variable-length extenders that are automatically determined from the length of the drawn link objects. For analysis, the extender is effectively a linear spring that is in series with the damper.


A built-in material library has been added for Canada with steel materials per the CSA G40.20-13/G40.21-13 standard, concrete materials per the CSA A23.3 standard, and rebar materials per the CSA G30.18:21 standard.



An enhancement has been made to speed up generation of the analysis model for models with nonlinear staged-construction load cases and many area objects using line constraints.



The concrete code “CSA A23.3-19” has been added for reinforced-concrete and post-tensioned slab design.


Reinforced-concrete and post-tensioned slab design have been updated for the NZS 3101-06 code to accommodate Amendments 1 to 3.


A new concrete slab design preference is available for the "ACI 318-19" code to optionally set the depth-dependent shear-strength reduction factor, Lambda_s, to 1.0 for mats and footings per ACI 318-19



An enhancement was made so temperature loads on overlapping area objects will be applied additively. Previously, temperature loads assigned to the slab would not affect overlapping drop panel objects.

Output and Display


Integrated wall reactions are now available for graphical display and in a new database table.

Application Programming Interface (API)


The Application Programming Interface (API) has been enhanced with the addition of functions to get and set:
  • • Parameters for the Italian NTC 2018 response-spectrum function.
  • • Design preferences and design overwrites for steel frame code CSA-S16-19.
  • • Parameters for eigen and Ritz load cases.


The following enhancements have been made to the Application Programming Interface (API):

  • • The client can attach to any running instance of ETABS given its process ID.
  • • A new command "Set as active instance for API" has been added to the Tools menu.
  • • A new interface cPluginContract has been added to simplify plugin development.
  • • Speed has been improved for external .NET clients that call the API by chaining properties and methods in deeply nested loops.


Released 31-Mar-2022

Release Notes

Structural Model


A new general shear wall hinge has been added, which consists of a pair of orthogonal P-M3 or Fiber P-M3 hinges, plus a linear or nonlinear shear material. These features allow the hinge to be used for modeling spandrels as well as piers, and to handle more complex wall geometries, such as near openings or geometry transitions. General shear wall hinges can be used for nonlinear static, staged-construction, and direct-integration time-history analyses.


The age of concrete at which loading is applied can now be specified for long-term cracked-section analysis. Previously, the age at loading was assumed to be 7 days.


20.1.0_ETA_CSA A23.3_concrete_design

The CSA A23.3-19 code has been added for concrete frame design.

The CSA S16-19 code has been added for steel frame design.

The CSA S16-19 code has been added for composite beam design.

Data Files


The handling of time history functions defined in external data files with many data points has been significantly enhanced for speed.


New section-property database files have been added for steel sections produced by Indian manufacturers TATA, Jindal Steel Ltd. and APL Apollo Ltd.


Released 11-Jan-2022

Release Notes

CSI Spotlight


Watch our Spotlight Videos to learn more about the latest enhancements in ETABS v20.0.0.

Part 1 - Modeling & Loading

Part 2 - Design & Performance-Based Design

Structural Model


Support lines have been added for faster modeling of design strips, tendons, and slab panels. They can be drawn and edited on-screen as well as generated automatically along grid lines.


Slab panels are a new entity that can be automatically generated using grids or support lines, or they can be user-drawn. They overlay the floor system and can be used to apply live load for load-pattern analysis, and they can also be used to report mid-panel displacements and soil-pressure summaries.


Moment and shear releases can now be specified along lines within a slab object. Previously hinges could only be specified at the boundaries of slab objects.


Time-dependent behavior of concrete has been added for the AS3600-2018 code, including creep, shrinkage, and age-dependent stiffness.


Scale factors can now be applied to time-dependent material properties - creep, shrinkage, and stiffness - allowing more control over behavior for special situations.



Pattern Live load is now available as a type of loading, allowing manual assignment of live loads to different regions of the structure that will be automatically varied in load combinations to produce the maximum response.


Pattern loading, including Auto-Pattern loading, can now be assigned to slabs. Auto-Pattern loading automatically creates multiple load patterns from specified live loads on slabs, each loading a single slab panel.



Auto wind loading has been added for the AS/NZS 1170.2:2021 code.


Temperature gradient loads can now be assigned to frames and shells, representing a change in temperature across the depth that tends to cause bending.



New staged-construction operations are available to change stiffness modifiers applied to frames and shells, as well as end releases applied to frames. These operations reference named sets of modifiers and releases and they can be applied to individual objects or groups.


The speed of analysis has been improved for nonlinear modal time-history (FNA) load cases that have a large number of undamped linear link elements, such as for meshed base mats on an elastic foundation.


The analysis engine has been optimized for newer AMD CPUs.



The reporting for the PT design of slabs has been enhanced with tabular and graphical displays of the moment capacity at every station of the design strips, as well as a tabular display of the pre-compression due to PT along the strips.


Several enhancements have been made to Eurocode 2-2004 concrete frame design, including improved calculation of slenderness effects and new national-annex values of TanTheta for shear design.


Slab design for IS 456:2000 now provides an option increase longitudinal reinforcement in slabs as needed to avoid shear links in the slab.

20.0.0_ETA_Euro_NTC_steel design

Several enhancements have been made to steel frame design for the Eurocode 3-2005 and NTC 2008/2018 codes, including improved calculation of Mcr, and results output referred to y-z axes rather than major-minor axes.

Performance-Based Design


Nonlinear frame hinges can now be automatically generated for coupling beams per ASCE 41, Table 10-19 for flexure-controlled members and Table 10-20 for shear-controlled members.


User-specified rebar material is now available for defining vertical and horizontal wall hinge reinforcement.


The hysteresis type can now be specified for certain types of auto-generated frame hinges.

Integration with Perform 3D


Imports from Perform3D now support nonlinear components "Moment Hinge, Rotation Type", "Shear Hinge, Displacement Type", and "P-M2-M3 Hinge, Concrete Rotation Type". Additionally, the following load types can now be imported: Self Weight, Nodal Loads, and Element Loads.



On-screen measuring tools are now available to measure line lengths, the angles between two lines, and the areas and perimeters of closed polygons.


PT tendon display options now include Number of Strands, Tendon System, Vertical Profile Control Points, Vertical Profile Values, Total Length, Jacking Force, and Elongation.

Database Tables


A new table displays the applied, reactive, and net diaphragm forces acting at column and wall locations for selected floors.

Data Exchange


EXR files can now be imported and exported directly between ETABS and CSI products SAP2000 and SAFE. Previously this feature required using CSiXRevit as an intermediary.


Shell uniform load sets can now be exported from ETABS for import into Revit using CSiXRevit.

Application Programming Interface (API)


API functions have been added or enhanced for accessing SP 63-13330-2021 concrete frame design, Eurocode 3-2005 steel frame design, and NTC 2008/2018 steel frame design.


Released 31-Mar-2021

Release Notes


19.1.0_ETA_UI_PT tendon profile

PT tendon vertical profile enhanced. All editable information related to the tendon profile, geometry, loads, and losses are available in one location.

19.1.0_ETA_analysis_null line

Line Spring assignments are now available for “Null” line objects.


19.1.0_ETA_model_uniform area loads

Uniform area loads assigned to floor objects are now additive when the loaded objects overlap.

19.1.0_ETA_loading_seismic ASCE 7-16

ASCE 7-16 auto seismic load has been enhanced to incorporate the exception contained on section 11.4.

19.1.0_ETA_loading_seismic AS 1170

AS 1170.4 auto seismic load has been enhanced for base shear scaling based on Amendment 1.


19.1.0_ETA_design_user control

Concrete beam and strip-based slab design now allow control over including or excluding axial compression in flexural design if the axial compression reduces the required reinforcement. Axial tension and axial compression that increase the required flexural reinforcement are always considered. For post-tensioned construction all axial load is always considered. 

19.1.0_ETA_design_Euro 2004

Eurocode 2-2004 concrete frame design has been updated to consider the extra longitudinal rebar due to shear.

Performance-Based Design


  • Calculation of shear yield (Vy) now includes user-specified rebar in beam and column hinges even if the member has not been designed.
  • Faster initialization and finalization of the analysis process when running cases in parallel.
  • Faster nonlinear stiffness formation, event determination, and state update operations for small to moderate sized models.

Database Tables

19.1.0_ETA_UI_interactive database

Interactive database editing is now available for Section-Designer (SD) sections, including general pier SD sections.

Import and Export

19.1.0_ETA_UI_Revit IDs

Mapping of Revit element Unique IDs to ETABS Object GUIDs can now be exported to Excel. 

Application Programming Interface (API)


Improved performance and examples for remote API and COM clients. New Python API example uses direct communication with underlying .Net Objects.

19.0.1 | 19.0.2

Released 23-Dec-2020

Release Notes


ETABS 19.0.1 Analysis Enhancements

  • Stiffness solution has been parallelized to further speed-up nonlinear static and direct-integration time-history load cases.
  • Tabular output for element nonlinear energy and base reactions is now much faster for load cases with many output steps.


ETABS 19.0.1 Loading Enhancements

NBCC 2015 wind load now supports the dynamic procedure for Open and Rough Terrain using the exposure factor Ce. Wind-load calculations are now available in the project report.