Lessons Learned In Structural Software: Implementing A .

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Topics Moment Frames: Design and Detailingper AISC 341 and 358 By Matthew J. Mester, PE, SE Moment Frame Design PrinciplesR 3 Moment Frame SystemsR 3.5 Ordinary Moment Frame SystemsR 4.5 Intermediate Moment Frame SystemsR 8 Special Moment Frame SystemsConnection Design PrinciplesConnection Types in AISC 358SidePlate Systems, Inc.SE University, June, 20172www.LearnWithSEU.comLearning ObjectivesTopicsIdentify how drift can be controlled inmoment frames Differentiate between R 3, OMF, IMF,and SMF lateral systems Identify when to use AISC 358prequalified connections in momentframes Moment Frame Design PrinciplesR 3 Moment Frame SystemsR 3.5 Ordinary Moment Frame SystemsR 4.5 Intermediate Moment Frame SystemsR 8 Special Moment Frame SystemsConnection Design PrinciplesConnection Types in AISC 35834Lateral Analysis/Choosing your Code Lateral Analysis/Choosing your CodeWhat code is required in your jurisdiction? 5What code is required in your jurisdiction?6

Lateral Analysis/Choosing your Code Lateral AnalysisWhat code is required in your jurisdiction?ASCE 7-05, IBC 2006 or IBC 2009, AISC 360-05,AISC 341-05, AISC 358-05 What is important in Moment Frame Design?BeamsASCE 7-10, IBC 2012 or IBC 2015, AISC 360-10,AISC 341-10, AISC 358-10 including /ColumnConnectionFuture codes: ASCE 7-16, IBC 2018, AISC 360-16,AISC 341-16, AISC 358-16 including SupplementsDrift?, Strength?, Ductility?78Lateral Analysis Lateral Analysis for Wind LoadsTypically, DRIFT will govern the design of momentframes, not STRENGTH, but must check bothWhat governs drift in Moment Frames? Rotation of beamsRotation of columns Base conditionsDeformation of panel zones To limit drift, you can increase beams, columns, or panelzone thickness BUT you will have the most successwith increasing BEAM sizeDrift Limits for Wind ProvisionsWhat is required? Is it the Law?IBC 1604.3 Serviceability: “Structural Systems shallhave adequate stiffness to limit deflections andlateral drift.”ASCE 7-10 §1.3.2 Serviceability: “Structural systems,and members thereof, shall be designed to haveadequate stiffness to limit deflections, lateral drift,vibration, or any other deformations that adverselyaffect the intended use and performance of buildingsand other structures.”910Lateral Analysis for Wind Loads Lateral Analysis for Wind LoadsWhat is required? Is it the Law?ASCE 7-10 §C1.3.2 Commentary Appendix C –Serviceability Considerations (non-mandatory):“Serviceability limit states involve the perceptions andexpectations of the owner or user and are acontractual matter between the owner or user and thedesigner or builder. It is for these reasons, andbecause the benefits are often difficult to define orquantify, that serviceability limit states for the mostpart are not included within the model United StatesBuilding Codes.”11 How do you select drift limits?AISC Design Guide 3 – Serviceability DesignConsiderations for Steel Buildings by West & Fisher ǻ H/400, H/500, H/600 for frames with spandrelsupported cladding depending on type of exteriorsystem using a 10-year wind MRI 12

Lateral Analysis for Wind Loads Lateral Analysis for Wind LoadsHow do you select drift limits?“Serviceability Limit States Under Wind Loads” byLawrence G. Griffis, EJ AISC, v30, 1993 Q1 ǻ H/400 for steel frames (H story height and totalheight) H/400 corresponds to 1/4” in 8’ (the damagethreshold limit for gypsum wallboard), or 3/8” in 12’which corresponds to standard soft joint thicknessin brick veneer construction. Cd G xeI14The R Factor in Moment Frame DesignDrift Limits for Seismic Provisions (ASCE 7 Table 12.12-1) ASCE 7 Design Coefficients (ASCE 7 Table 12.2-1)Maximum drift based on ASCE 7 provisions1516Seismic Design PrinciplesResponse Spectrum of MRFs

Panel zone requirements of Section J10.6 of AISC 360 Continuity plate requirements of Sections J10.1-10.3 of AISC 360 PR Connections must be designed for minimum of: p50%*M of beam for flexural strength Shear strength similar to FR OMF connection 28 R 3.5 OMFs When would you use an OMF

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