RAM Frame Release (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 |

New Features\Enhancements NBC of Canada 2005 –Wind (Section 4.1.7, Division B) –Seismic (Section , Division B) –Modal Response Spectra Analysis (Section , Division B) 3 |

New Features\Enhancements Nodal Moments In-core and Out-of-Core Sparse Solver Updated (faster execution time) 4 |

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) 5 |

Eccentric Loads on Semirigid Diaphragm 6 |

7 | Eccentric Wind Loads Uniform 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 Wind Line Load (Y+E)

8 | Eccentric Seismic Loads Distributed 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 | 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 |

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. 11 |

Enhancement for Current P-Delta Implementation (Rigid Diaphragms) 12 |

Enhancement for Current P-Delta Implementation (Rigid Diaphragms) 13 | Diaphragm Mass used for Calculating P-Delta Effects (default) Dead + Live Loads Applied to Diaphragm used for Calculating P-Delta Effects

NBC of Canada |

NBC of Canada Wind 15 |

NBC of Canada Wind 16 |

NBC of Canada Seismic 17 |

NBC of Canada Seismic 18 |

NBC of Canada 2005 – Modal Response Spectra Analysis 19 |

NBC of Canada Modal Response Spectra Analysis 20 |

Nodal Moments 21 |

Nodal Moments Nodal Loads Defined in RAM Modeler: 22 |

Nodal Moments Nodal Loads Used in RAM Frame 23 |

24 | 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)

25 | Center of Rigidity Report Diaphragm Lateral Stiffness Terms (used for identifying soft\weak story according to code specifications)

26 | Applied Story Forces Dialog

Further Information –The Bentley Structural Team (communities.bentley.com/) 27 |

Further Information –RAM Structural System V8i ( 28 |