RAM Frame Release 14.02 (January 2010) Bulent N. Alemdar, Ph.D., P.E. SR Software Product Research...

RAM FrameRelease 14.02 (January 2010)

Bulent N. Alemdar, Ph.D., P.E.SR Software Product Research Engineer

New Features\Enhancements

• Eccentric Loads on Semirigid Diaphragm (i.e., torsional moments due to accidental eccentricity effects)– Wind, Seismic and Response Spectra Analysis

• P-Delta for Semirigid Diaphragms

• Enhancement for Current P-Delta Implementation (Rigid Diaphragms)– P-Delta effects due to mass loads (default)– Or P-Delta effects due to Dead and Live Loads

2 | WWW.BENTLEY.COM


• NBC of Canada 2005

– Wind (Section 4.1.7, Division B)

– Seismic (Section 4.1.8.11, Division B)

– Modal Response Spectra Analysis (Section 4.1.8.12, Division B)

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• Nodal Moments

• In-core and Out-of-Core Sparse Solver Updated (faster execution time)

4 | WWW.BENTLEY.COM


• Center of Rigidity Report Updated– Diaphragm Lateral Stiffness Reported

• Loads & Applied Forces Report Updated– Windward and Leeward Pressures Reported for

Semirigid Diaphragms

• Applied Story Forces Dialog– Alternative Ways to Scale Arrows (Log and

Linear Scaling)

5 | WWW.BENTLEY.COM

Eccentric Loads on Semirigid Diaphragm

6 | WWW.BENTLEY.COM

7 | WWW.BENTLEY.COM

Eccentric Wind LoadsUniform wind load profile is converted to a trapezoidal

load profile that generates code specified eccentric effects (i.e., accidental torsion effects)

Uniform Wind Line Load (Y)

Trapezoidal WindLine Load (Y+E)

8 | WWW.BENTLEY.COM

Eccentric Seismic LoadsDistributed seismic nodal loads are modified to reflect

code specified eccentric effects (i.e., accidental torsion effects)

Seismic loads increased

Seismic loads reduced

Deflected shape indicates eccentric loading (Y+E)

9 | WWW.BENTLEY.COM

Response Spectra Analysis

Distributed seismic nodal masses modified to reflect code specified eccentric effects (i.e., accidental torsion effects)

P-Delta for Semirigid Diaphragms

10 | WWW.BENTLEY.COM

P-Delta for Semirigid Diaphragms

• A separate analysis internally run for gravity load cases (dead + live )– Axial forces (also referred to as P-Delta axial force) for

columns inside semirigid diaphragms are stored– These axial forces are utilized to compute element

geometric stiffness matrices for the columns.

• All load cases are run with modified column stiffness (i.e., element geometric stiffness matrices applied to column stiffness)

• This process is automated and transparent to user.


Enhancement for Current P-Delta Implementation (Rigid Diaphragms)


Enhancement for Current P-Delta Implementation (Rigid Diaphragms)


Diaphragm Mass used forCalculating P-Delta Effects (default)

Dead + Live Loads Applied to Diaphragm used for Calculating P-Delta Effects

NBC of Canada 2005


NBC of Canada 2005 - Wind


NBC of Canada 2005 - Seismic


NBC of Canada 2005 – Modal Response Spectra Analysis


NBC of Canada 2005 - Modal Response Spectra Analysis


Nodal Moments


Nodal Moments

• Nodal Loads Defined in RAM Modeler:


Nodal Moments• Nodal Loads Used in RAM Frame



In-core and Out-of-Core Sparse Solver Updated

New version of In-Core & Out-of-Core Sparse Solver integrated. It provides further reduction in analysis time (performance gain for large models)


Center of Rigidity Report

Diaphragm Lateral Stiffness Terms (used for identifying soft\weak story according to code specifications)


Applied Story Forces Dialog

• Further Information– The Bentley Structural Team (communities.bentley.com/)


• Further Information– RAM Structural System V8i (www.bentley.com\

ramstructuralsystem)


RAM Frame Release 14.02 (January 2010) Bulent N. Alemdar, Ph.D., P.E. SR Software Product Research...

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