Etabs for Users

8/19/2019 Etabs for Users

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The ETABS model explorer greatly enhances the user's ability to manage the data in their model. Users candefine, duplicate, and modify properties in groups. Drag and drop properties right onto the models forassignment. User defined displays can be easily setup in the model explorer to for quick navigation.

Hardware Accelerated GraphicsDirect X graphics with hardware accelerated graphics allow for navigation of modelswith fly-throughs and fast rotations.


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Analytical model views display the finite element model of the structure which is made up of the theconnectivity of the joints, frames, and shells and defined meshing.


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Physical model views accurately display cardinal insertion points, local axes rotations, wall junctions, andgeometry.

Grid SystemsIn ETABS, grids can be defined as cartesian, cylindrical, or general free-form gridsystems. There is no limit to the number of grid systems in a model, and they can be

rotated in any direction or placed at any origin within the model.


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Drawing ToolsMany drawing and drafting utilities are built into ETABS to enhance the engineer'smodeling experience. Users will find that many of the common industry standardshortcuts and controls are also available in ETABS.

Intelligent Snaps

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Architectural Tracing

Intelligent snaps make model generation simple by automatically detecting intersections, extensions, parallels,and perpendiculars. Drawing helper tools will show physical extrusions even when in analytical draw mode.

Easily import an architectural DXF/DWG into the background of the ETABS modeling window and use it as atemplate to trace over to help you create your model. Turn layers on and off to easily pick which layer(s) youwant to see. You can also right button click on an element to quickly convert an area into an ETABS structuralobject.

Plans and Elevations

Plan and elevation views are automatically generated at every grid line to allow forquick navigation of the model. Users can create their own elevation sections by usingour Developed Elevation feature.

Plan and Elevation Views

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Developed Elevations

When in a 2D view, see arrow buttons to quickly move from grid line by grid line. A transparent plane will beshow in the 3D view to show you exactly which elevation or plane you are looking at in the model.

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Developed elevations can elevate any drawn path on a plan view. This is particularly useful for elevating afacade that takes a very unique shape. Once the developed elevation is drawn, it will then be added to the listof elevations in the model.

Interactive Table Data EditingETABS data can be viewed and edited using on-screen dockable tables. This is quiteuseful for defining a model from spreadsheets or viewing analysis or design results.


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Meshing Tools

Engineers have many options when it comes to mesh generation in ETABS. Simply

select the area object and then select the rules for the automatic mesh generator to use. Object Based Meshing External Meshing Line Constraints

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Object meshing is automated based on maximum element size. The mesh will always be parallel and perpendicular to longest edge, grid system, or area local axes and aims to maintain good element aspect ratios.


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Users also have the option to manually mesh objects into the model. This is referred to as external meshing.The results in a one-to-one correspondence between object and elements.


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The Automatic Edge Constraint is an internal algorithm that will address the issue of mismatched meshes. Forexample, if the nodes of a ramp and a wall do not match up, ETABS will internally connect all mismatchedmeshes using a special joint interpolation algorithm to act as a “zipper” between the elements.

Building ComponentsTowers

Multi-tower buildings can now easily be modeled by using the new tower feature.Defining towers in an ETABS model allows users to define unique story levels andgrid systems for different building structures within the same ETABS model. Forexample, ETABS models can share a podium level and then separate into towers onhigher floors.


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Beams, Columns, BracesIn ETABS, beams, columns, and braces are frame elements that can be straight orcurved. They are used in a general, three-dimensional, beam-column formulationwhich includes the effects of biaxial bending, torsion, axial deformation, and biaxialshear deformations. Intermediate joints will automatically be generated where othermembers intersect with the frame to ensure finite element connectivity.


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Section PropertiesETABS has a built-in library of standard concrete, steel, and composite section properties of both US and International Standard sections. Even non-prismatic and built up steel sections can be easily defined. Use our Section Designer for morecomplex sections.


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Shells (Walls, Floors, Ramps)Shell elements are used to model walls, floors, and ramps. A layered shell element has been added in ETABS that considers mixed material composite behavior, as well asnonlinear material behavior options for each layer based on stress-strain, withshearing behavior considered for rebar layered shell sections.


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Shear Walls Wall Stacks Piers and Spandrels

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Customizable wall configuration templates help you define your wall section properties with ease by drawingmultilevel wall configurations in a single click. When you draw walls using the wall stack, all pier andspandrel labeling is automatically assigned.


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Pier and spandrel labels produce integrated shears and moments for design purposes, for walls modeled witharea finite elements. For example, an assemblege of 20X20 meshed shear wall areas could have resultsdisplayed and reported as if it were a single column.

Link ElementsETABS has a many different link elements available for users to accurately representthe behavior of a structure. Link elements types include Linear, Multi-linear Elastic,Multi-linear Plastic, Gaps, Hooks, Dampers, Friction Isolators, Rubber Isolators, T/CIsolators, and Triple Pendulum Isolators.


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Hinge PropertiesUsers can create and apply hinge properties to perform pushover analyses in ETABS. Nonlinear material behavior in frame elements (beam/column/brace) can be modeledusing fiber hinges. Mixed materials, like reinforced concrete, and complex shapes can

be represented. Yielding, cracking, and hysteresis behavior can all be captured usinghinge properties.


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Floor DiaphragmsRigid, semi-rigid, and flexible floor diaphragms can be defined in ETABS.Diaphragms can be assigned to joint objects or area objects.


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Supported codes included in ETABS

ASCE 7-10 ASCE 7-05 ASCE 7-02 AS/NZS 1170 2002 GB50011-2010

Eurocode 8 2004 IS 1893 2002 Italian NTC 2008 NBCC 2010 NBCC 95

NBCC 2005 Turkish Seismic Code 2007 NZS 1170 2004 BOCA 96 NEHRP 97


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UBC 94 UBC 97 UBC 97 Isolated

Supported codes included in ETABS

ASCE 7-88 ASCE 7-95 ASCE 7-02 ASCE 7-05 ASCE 7-10

AS/NZS 1170.2:2002 GB50009-2012 Eurocode 1 2005 Indian IS875:1987 Italian NTC 2008

NBCC 2010 NBCC 95


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NBCC 2005 Turkish TS 498-97 BOCA96

BS 6399-95

Mexican UBC 94 UBC 97

Point, Line, Area, and Thermal LoadsETABS is robust when it comes to assigned loads. Uniform or non-uniform surfaceloads can be assigned in any direction, not just gravity. Uniform or trapezoidal loadscan be defined on lines in any direction. Thermal load can be assigned to joints, lines,and areas.


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CladdingAutomatically add analytical cladding to entire structure for loading purposes.


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Live Load ReductionLive-load-reduction factors may be assigned on a member-by-member basis. Thismay be done either within the graphical user interface, once design is complete, byright-clicking on a member, or it may be done using interactive database editing.

Supported codes and user defined types included in ETABS

ASCE 7-95 ASCE 7-05 ASCE 7-10 AS/NZ 1170.1-2002

Chinese GB 50009-2012 Eurocode 1991:2002 Hong Kong COP 2011 IS 875-1987

NBCC95 NBCC2005 NBCC2010 UBC97

User Parameters (per Section 1607.5, UBC 1997) User Defined Curves (By Tributary Area)


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User Defined (By Stories Supported)


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ETABS dynamic analysis capabilities include the calculation of vibration modes usingRitz or Eigen vectors, response-spectrum analysis, and time-history analysis for bothlinear and nonlinear behavior.

Dynamics Overview Response Spectrum Analysis

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Time History Analysis

Eigen-vector modal analysis finds the natural vibration modes of the structure, which can be used forunderstanding the behavior of the structure, and also as the basis for modal superposition in response-spectrumand modal time-history load cases. Ritz-vector modal analysis finds the optimum modes for capturingstructural behavior in response-spectrum and modal time-history load cases, and is more efficient for this

purpose than Eigen-vector analysis.

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Response-spectrum analysis determines the statistically likely response of a structure to seismic loading. Thislinear type of analysis uses response-spectrum ground-acceleration records based on the seismic load and site

conditions, rather than time-history ground motion records. This method is extremely efficient and takes intoaccount the dynamical behavior of the structure.


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Time-history analysis captures the step-by-step response of structures to seismic ground motion and othertypes of loading such as blast, machinery, wind, waves, etc. Analysis can use modal superposition or direct-

integration methods, and both can be linear or nonlinear. The nonlinear modal method, also called FNA forFast Nonlinear Analysis, is extremely efficient and accurate for a wide class of problems. The direct-integration method is even more general, and can handle large deformations and other highly nonlinear

behavior. Nonlinear time-history analyses can be chained together with other nonlinear cases (including stagedconstruction) addressing a wide range of applications.

P-DeltaP-delta analysis captures the softening effect of compression and the stiffening effectof tension. A single P-delta analysis under gravity and sustained loads can be used tomodify the stiffness for linear load cases, which can later be superposed.Alternatively, each combination of loads can be analyzed for full nonlinear P-delta

effects. P-delta effects are included for all elements and are seamlessly integrated intoanalysis and design.


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BucklingLinear (bifurcation) buckling modes of a structure can be found under any set ofloads. Buckling can be calculated from a nonlinear or staged-construction state. Fullnonlinear buckling analysis is also available considering P-delta or large deflectionseffects. Snap-through buckling behavior can be captured using static analysis withdisplacement control. Dynamic analysis can be used for modeling more complex

buckling, such as follower-load problems.


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PushoverPushover analysis features in ETABS include the implementation of FEMA 356 andthe hinge and fiber hinge option based on stress-strain. The nonlinear layered shellelement enables users to consider plastic behavior of concrete shear walls, slabs, steel

plates, and other area finite elements in the pushover analysis. Force-Deformationrelations are defined for steel and concrete hinges.


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Time Dependent

Incremental construction sequence modeling and loadings can be modeled in ETABS.

Nonlinear effects can be considered such as large deflections, yielding, and gapopening and closing. Time-dependent creep, shrinkage, and strength-change effectswill all so be taken into account.

Construction Sequencing Creep and Shrinkage

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Users can add arbitrary loading sequences at various points to simulate real life construction conditions.


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Long term deflections due to creep and shrinkage can be computed along with staged sequential constructionanalysis. Time dependent material properties are based upon the 1990 edition CEB-FIP code and user definedcurves are used to compute creep strains.

Load Cases and CombinationsETABS allows for an unlimited number of load cases and combinations. Loadcombination types include linear additive, envelope (min/max), absolute add, SRSS,and range combinations. Combination components can include other combinations.


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Documents

Etabs for Users