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

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New Features\Enhancements

• 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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New Features\Enhancements

• Nodal Moments

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

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New Features\Enhancements

• 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)

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Eccentric Loads on Semirigid Diaphragm

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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)

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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)

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Response Spectra Analysis

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

P-Delta for Semirigid Diaphragms

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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.

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Enhancement for Current P-Delta Implementation (Rigid Diaphragms)

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Enhancement for Current P-Delta Implementation (Rigid Diaphragms)

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Diaphragm Mass used forCalculating P-Delta Effects (default)

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

NBC of Canada 2005

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NBC of Canada 2005 - Wind

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NBC of Canada 2005 - Wind

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NBC of Canada 2005 - Seismic

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NBC of Canada 2005 - Seismic

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NBC of Canada 2005 – Modal Response Spectra Analysis

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NBC of Canada 2005 - Modal Response Spectra Analysis

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Nodal Moments

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Nodal Moments

• Nodal Loads Defined in RAM Modeler:

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Nodal Moments• Nodal Loads Used in RAM Frame

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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)

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Center of Rigidity Report

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

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Applied Story Forces Dialog

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

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

ramstructuralsystem)

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