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The Load Takedown Method distributes loads from floors onto beams, columns, and walls. The load is transferred down from the upper storey to the storey below and down to the foundation.
This analysis is mostly oriented on fast, yet informative analysis in early design stages and where gravity loads are essential for building design decisions.
The three primary objectives for this new capability are to enable engineers to:
- Determine reactions on foundations in very early design stages when design work on the upper part of the building is still being done.
- Understand building behavior to determine the best column layout distribution.
- Get loads transferred to individual objects so that object-based code design is possible using traditional engineer handy design code tools or even spreadsheets.
The Load Takedown Method provides structural analysis results in the following forms:
- Resulting loads on individual structural objects such as beams, columns, and walls coming from the floor load distribution, which can be used as a load input in external design applications.
- Internal forces in beams and columns based on obtained resulting loads which can be consumed in internal design modules.
- Reactions on supports.
You can control and accurately create your Revit analytical model in the context of any structural physical model geometries.
The Analytical Driven Modeling approach for Revit introduces new enhanced structural modeling capabilities for analytical modeling.
The analytical elements are no longer created automatically with the physical model. The autonomous analytical model is represented by elements such as members, panels, and links, interconnected at nodes. The analytical model contains all the properties and data needed for analysis using tools like Autodesk Robot Structural Analysis.
Improved Load Distribution from Cladding to Members and Walls
Load distribution from claddings to beams, columns, and panels was improved in terms of quality and performance.
- Corrected load distribution on claddings with objects or elements carrying the load overlap.
- Improved the performance of load distribution on claddings.
- Improved distribution of linear loads on edges applied to multiple panel and cladding types defined as a single load record.
- Corrected load direction on bars coming from cladding load distribution.
Release Notes for Autodesk Robot Structural Analysis Professional 2023
Added grip marks in all resizable dialogs for users t easily discover this behavior.
Added grip mark to resize the Display dialog box.
Reorganized the help menu content, giving access to the community forum.
Corrected the behavior of object groups with empty content, as they were not visible on the group list.
Implemented the multipoint linear load for edges to get correct load distribution from cladding to walls.
Updated the material database for Brazil with the list of concretes and steels based on Brazilian design codes.
PN-EN design codes have been set as default for Polish settings instead of legacy PN-B codes.
Improved the performance of pasting data into the load tables.
Corrected API detection of number of points in manually defined spectrum for Spectral Analysis.
Reinforced Concrete Design
Added the reinforcement rebar database according to the Brazilian standard ABNT NBR 6118:2014.
Added the reinforcement rebar database according to the ASTM and ASTM-Metric provision.
Improved calculation time and performance in required reinforcement calculation for columns.
Corrected detection of openings in a slab while checking critical perimeter for punching.
Refactored the Required Reinforcement Software Development Kit (SDK) for ease of use.
Help and Documentation
Translated the online help content into new languages: Spanish and Portuguese-Brazilian.
Corrected user interface translations for the Portuguese-Brazilian language.
Enabled proper release conditions reported in tables in case of releases assigned in the opposite direction than the local X direction of a member.
Fixed an issue with a missing tooltip when hovering over the Core Walls icon.
Fixed an issue causing software instability during work in the Object Inspector.
Fixed an issue with the background color on the viewer screen capture.
Corrected the position of the tab selection list when the Windows taskbar is on the left or on the right side of the screen.
Fixed an issue with the model opening in the Spanish regional settings when the file was saved with the Education version of the program.
Fixed an issue with the content of the command menu for construction types other than Shell model.
Enabled copying panels to earlier versions of Robot Structural Analysis.
Improved Moving Load dialog box layout when resized.
Fixed an issue showing a wrong menu type during the second opening of the Toolbar and Menu tab in the Preferences dialog box.
Improved the label, text, and description movement in the model viewer.
Improved the diagram display for the gap/hook non-linear support definition.
Corrected an issue where a Story name was not showing in the Inspector properties.
Corrected software instabilities that could happen on a model viewer.
Fixed an issue causing software instabilities while reviewing tables.
Corrected an issue with opening DXF files that were previously saved by the program.
Fixed an issue causing a software instability while saving a model with large number of panels in STR format.
Removed incorrect plastic section modulus for symmetrical angles in the central system of coordinates in EuroPro, CatPro, and RPLN7Pro steel section databases.
Corrected an issue resulting in an error message when transferring the model from Robot Structural Analysis to Revit with an empty combination definition, without load cases.
Corrected an issue where loads on cladding in Robot Structural Analysis were not preserved on round-trip transfer with Revit.
Loads and Combinations
Fixed an issue causing software instability during Snow and Wind loads generation for frames.
Fixed an issue which caused the inability to enter a user-defined factor in the combination table.
Corrected the external pressure coefficients (Cpe) for wind load generation according to the EC 1991-1-4 code.
Corrected the internal pressure coefficients (Cpi) for wind load generation on frames with openings according to the EC 1991-1-4 code.
Corrected the basic wind load pressure for walls according to the EC 1991-1-4 being calculated as for wall height instead of the roof ridge height.
Fixed an issue with displaying the vehicle load in the moving loads case.
Fixed an issue with a description of a planar load in the load tables for the Frame 3D structure type.
Improved load distribution on claddings, which often ended with the unjustified warning "The load has not been distributed correctly - There are no objects or elements carrying the load overlap".
Improved the distribution of linear loads on edges applied to multiple panel and cladding types defined as a single load record.
Fixed an issue causing the inability to enter the letter Z in the Memo field of load tables.
Fixed separate display of added masses "defined manually" and "converted from loads".
Fixed an issue causing a wrong load direction on bars coming from cladding load distribution.
Fixed an issue with the scaling factor for the self-weight load which was not considered in load to mass conversion for dynamic analysis.
Fixed an issue causing incorrect results for Time History Analysis occurring when a buckling case was defined right before a Time History Analysis case.
Enabled calculation of nonlinear combinations with load cases generated by wind simulation.
Corrected the resonance build-up factor value in Footfall analysis for stairs according to SCI P354, which was incorrectly calculated due to missing limits for the velocity of walking.
Corrected calculations of Sequential Self Weight analysis.
Fixed an issue in nonlinear buckling analysis when "determine positive critical coefficients only" is checked.
Fixed an issue for the multithread solver when running calculations in two instances of the program simultaneously.
Corrected calculation of spectrum parameters for IBC seismic codes (2000, 2006, 2009, 2012 and 2018) for site class E.
Improved the stability of calculations run when another dialog window was opened in the program.
Improved calculation of load to masse conversion in the modal analysis when the option to create the main node for floor diaphragm in the Stories parameters was applied.
Corrected calculation for panels with diaphragm calculation model where mass was not considered in modal analysis.
Fixed an issue causing wrong results or no results while calculating a model with phases in Calculation Manager.
Fixed an issue causing a problem with displaying a legend on model printouts when the combination component selection dialog box was open.
Corrected the values of integrated forces and moments for cuts on solids.
Corrected the results for non-linear P-Delta combinations with notional load cases.
Fixed software instability on drawing forces diagrams in the Member Properties dialog box.
Fixed an issue causing software instability when generating print previews containing graphics.
Corrected stress reduction for shell elements when reduced stiffness is applied to the panel thickness.
Reinforced Concrete Design
Corrected environmental class information in calculation notes for column, foundation and wall provided reinforcement design according to ACI 318-14.
Implemented limit for nominal shear strength provided by concrete (Vc) for ACI 318-14 according to point 184.108.40.206.
Corrected an issue which caused not preserving the choice of steel material model in the Calculation Options dialog Longitudinal Reinforcement tab for the EN 1992-1-1 design code.
Corrected the selection of message in calculation error dialog box when the list of messages was longer than the dialog size.
Corrected the inability to select provided bar reinforcement elements in in the viewer.
Corrected the functionality of the lambda modification factor calculation for lightweight concrete in reinforced concrete design according to ACI 318-14 code.
Corrected the edition of rebar database with imperial units.
Corrected the required reinforcement design for members according to the CSA A23.3-04 code, issue caused by inconsistent data in the rebar database.
Corrected the import of required reinforcement to Deep Beam design, which was not considered in reinforcement distribution for panels located in a model on a plane different than ZY.
Reinforced Concrete Beam Design
Fixed an issue with a missing verification message in the Beam design module for EN 1992-1-1 code and National Annexes.
Enabled the span length edition for a stand-alone reinforced beam, created after a beam has been imported from the model.
Corrected the cover calculation to satisfy environment requirement for the BS-EN-1992-1-1 code.
Corrected the concrete material properties in provided reinforcement design when the same material with different properties is defined in the Job Preferences.
Fixed software instability when Geometry Optimization was active, and a beam geometry was changed during calculation.
Reinforced Concrete Column Design
Corrected the value display for a shear force on the Results tab for a column reinforcement.
Corrected the minimum cover value based on the environment class for the reinforced column design according to ACI 318-14 code.
Improved the consistency of results on the Result tab and in the calculation note for reinforced column design according to ACI 318-14 code.
Improved the visibility of force values for designed columns in the calculation note.
Corrected parameter names for reduction ratio of column stiffness due to sustained axial loads (βdns) and partial sustained axial loads (β) for ACI318-14 code.
Corrected verification for slender sway/non-sway columns for the ACI 318-14 and ACI 318-19 codes.
Reinforced Concrete Foundation Design
Removed the minimal reinforcement condition for foundations which is not required for NF-EN 1992-1-1 design code.
Corrected the display of Geotechnical template names in the Inspector drop-down list.
Corrected the display of Geotechnical template names on the Stress tab in the Geotechnical Options dialog box.
Corrected the import of steel element geometry to the foundation design module.
Corrected the calculations of the minimum required bottom reinforcement for isolated footing according to EN 1991-1-1 7.3.2.
Corrected splice reinforcement for lean concrete in the foundation design module for NF P 94-261 (Eurocode 7 with French National Annex).
Improved continuous footing optimization for soil stress.
Corrected the object update for reinforcement concrete continuous footing module after a model modification.
Corrected the Vc shear coefficient for foundation punching design according to the ACI 318-14 metric design code (p.220.127.116.11).
Reinforced Concrete Slab Design
Fixed a software instability when importing panels with required reinforcement to provided reinforcement design module.
Improved the transfer performance of panels with linear releases to the provided reinforcement design module.
Corrected the value of bar diameter in the required slab reinforcement calculation note for the BAEL rebar database.
Reinforced Concrete Wall Design
Corrected the limit of wall slenderness to 90 for reinforced concrete design according to the NF-EN 1992-1-1 code
Corrected the minimum cover value-based on environment class in Reinforced Wall design according to ACI 318-14 code.
Steel Connections Design
Fixed an issue causing wrong results for stiffness of bolt rows in a fixed Beam to Column connection design according to EN 1993-1-8.
Fixed an issue with the calculation of effective length of a bolt row above the beam flange in a Beam to Column connection design according to EN 1993-1-8.
Corrected the calculation of a column web tension (Ft,wc,Rd ) for Beam to Column End Plate connection design according to EN 1993-1-8.
Corrected the calculation of the compression force formula in the beam (F res) in a steel Beam to Beam connection design according to NF P 22-430.
Steel and Timber Design
Fixed an issue which caused the loss of the combination list used for steel design in the Calculations dialog box.
Corrected software instabilities that could happen in the steel design module.
Enabled steel design calculation when the moving load case is set as auxiliary.
Improved the stability of the program after switching to another application while being in the parametrized sections dialog box of steel design.
Corrected the steel design of a rectangular section created by API, due to incorrect plastic modulus Wpl.
Corrected the detection of bracings for buckling in local Z direction for the 2D Frame structure type.
Blocked the verification of steel members for user-defined sections without the required data, for example missing the flange or web thickness.
Corrected default parameters for emissivity coefficients for member surface (εm) and fire (εf) for EN 1993-1-1 code.
Corrected the calculation of shear area Ay and Az for welded I-shape profiles according to the EN 1993-1-1 code.
Corrected the flange class calculation for a box-shape cross-section according to the ANSI/AISC 360-16 code.
Corrected the calculation of the unbraced length coefficient (rt) for symmetrical I-shape sections according to the ANSI/AISC 360-16 code.
Corrected the deflection verification for a cantilever member with camber according to the NF EN 1995-1-1 timber design code.
Autodesk Robot Structural Analysis 2023 supports Windows 10 64-bit and Windows 11 64-bit.
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