Presentation on theme: "AISC N690: Appendix N9 Design of Steel-Plate Composite (SC) Walls By,"— Presentation transcript:
1 AISC N690: Appendix N9 Design of Steel-Plate Composite (SC) Walls By, 11/15/13Design of Steel-Plate Composite (SC) WallsBy,Amit H. VarmaUniversityCopyright, Amit H. Varma, Purdue Univ.
2 Outline Specification for Steel-Plate Composite Structures 11/15/13Specification for Steel-Plate Composite StructuresLayout and Organization of N690 Appendix N9Presentation Modules and LinksOngoing WorkCopyright, Amit H. Varma, Purdue Univ.
3 Objective11/15/13Specification for steel-plate composite SC walls in safety-related nuclear facilitiesUse with AISC N690 – LRFD codeInstead of ACI 349 code for concrete structures for nuclear facilities but all topics coveredSpecification for SC walls and associated connectionsCopyright, Amit H. Varma, Purdue Univ.
4 Path ForwardDevelop industry consensus standard for modular composite constructionNRC review standard and publish regulatory guideAISC N690-12: Specification for design of steel structures for safety-related nuclear facilitiesAISC TC12 – established ad-hoc sub-committee for modular composite constructionFirst Meeting Nov. 2006
5 Path Forward Sub-committee for modular composite construction Has 20 active membersFirst Meeting Nov. 2006Conducted a total of 164 meetings and numerous conference callsAttendees include guests from a variety of institutions as well as international participation
6 Schedule Schedule for completion Ballot 1 – Nov. 2013 Ballot 2 – June 2014 with public review commentsBallot 3 – Nov with public review commentsBallot 4 – Jan with final public review commentsANSI approved standard
7 ScheduleUS NRC has started the review process using the public review ballot no. 2Regulatory Guide based on N has been initiated, number allocated.NRC position on the ANSI approved standard should come shortly after.
8 Layout and Organization of App N9 11/15/13N Specification AdditionsNA3 – MaterialsNB2 – Loads and Load CombinationsAdd F and H, and tread them like D and L (ACI 349)NM2 – Fabrication, Erection, and ConstructionDimensional TolerancesMinimum Requirements for Inspection of Composite ConstructionsCopyright, Amit H. Varma, Purdue Univ.
9 Layout and Organization of App N9 11/15/13N9.1 Design RequirementsN9.1.1 General ProvisionsN9.1.2 Design BasisN9.1.2a Required StrengthN9.1.2b Design for StabilityN9.1.3 Compactness RequirementN9.1.4 Requirements for Composite ActionN9.1.4a Classification of Shear ConnectorsN9.1.4b Spacing of Shear ConnectorsN9.1.5 Tie RequirementsN9.1.5a Classification of TiesN9.1.5b Required Tension Strength for TiesCopyright, Amit H. Varma, Purdue Univ.
10 Layout and Organization of App N9 11/15/13N9.1 Design Requirements (cont’)N9.1.6 Design for Impulsive and Impactive LoadsN9.1.6a Definition of LoadsN9.1.6b Dynamic Increase FactorsN9.1.6c Ductility RatiosN9.1.6d Response DeterminationN9.1.7 Design and Detailing Around OpeningN9.1.7a Design and Detailing Requirements Around Small OpeningsN9.1.7b Design and Detailing Requirements Around Large OpeningsCopyright, Amit H. Varma, Purdue Univ.
11 Layout and Organization of App N9 11/15/13N9.2 Analysis RequirementsN9.2.1 General ProvisionsN9.2.2 Effective Stiffness for AnalysisN9.2.3 Geometric and Material Properties for Finite Element AnalysisN9.2.4 Analyses Involving Accidental Thermal ConditionsN9.2.5 Determination of Required StrengthsCopyright, Amit H. Varma, Purdue Univ.
12 Layout and Organization of App N9 11/15/13N9.3 Design of SC WallsN9.3.1 Uniaxial Tensile StrengthN9.3.2 Compressive StrengthN9.3.3 Out-of-Plane Flexural StrengthN9.3.4 In-Plane Shear StrengthN9.3.5 Out-of-Plane Shear StrengthN9.3.6 Strength Under Combined ForcesN9.3.6a Out-of-Plane Shear ForcesN9.3.6b In-Plane Membrane Forces and Out-of-Plane MomentsCopyright, Amit H. Varma, Purdue Univ.
13 Layout and Organization of App N9 11/15/13N9.4 Design of SC Wall ConnectionsN9.4.1 General ProvisionsN9.4.2 Required StrengthN9.4.3 Available StrengthCopyright, Amit H. Varma, Purdue Univ.
14 Flowchart: Design and Specs 11/15/13Begin design of structure with SC wallsCheck that SC section thickness, reinforcement ratio, faceplate thickness, steel and concrete grades satisfy the limitations of Section N9.1.1.Check that applicable requirements of Section N9.1.1 are satisfied.Copyright, Amit H. Varma, Purdue Univ.Are the requirements of N9.1.1 satisfied?Appendix N9 is not applicable. (Refer to Commentary for alternate methods)NoYesContinue
15 Flowchart: Design and Specs Continue11/15/13Check that faceplate is compact (Section N9.1.3)Provide composite action using shear connectorsClassify connectors as yielding or nonyielding type using Section N9.1.4a.Check spacing of shear connectors using Section N9.1.4bCopyright, Amit H. Varma, Purdue Univ.Provide structural integrity using tiesCheck tie spacing using Section N9.1.5.Check tie spacing in regions around openings using Section N9.1.7.Classify ties as yielding or nonyielding using Section N9.1.5a.Ties contribute to out-of-plane shear strength of SC walls according to Section N9.3.5Calculate minimum required tension strength for ties using Section N9.1.5b.Continue
16 Flowchart: Design and Specs Continue11/15/13Develop linear elastic finite element (LEFE) model according to Sections N9.2.1 and N9.2.3Analyze LEFE model for load and load combinations from Section NB2.Model openings using Section N9.1.7.Model flexural and shear stiffness of SC walls using Section N9.2.2.Loading due to accidental thermal conditions will be as per Section N9.2.4.Model second-order effects using Section N9.1.2bCopyright, Amit H. Varma, Purdue Univ.Perform LEFE analysis to calculate design demands and required strengths.Identify interior and connection regions using Section N9.1.2Calculate required strengths for each demand type using SectionN9.2.5Continue
17 Flowchart: Design and Specs Continue11/15/13Design Process for SC Walls: Required strengths ≤ Available strengthsCalculate available strengths for each demand type using Section N9.3.The sub-sections are:Available uniaxial tensile strength using Section N9.3.1Available compressive strength using Section N9.3.2Available out-of-plane flexural strength using Section N9.3.3Available in-plane shear strength using Section N9.3.4Available out-of-plane shear strength using Section N9.3.5Check available strength for combined forces using Section N9.3.6Combined out-of-plane shear demands using Section N9.3.6aCombined in-plane membrane forces and out-of-plane moments using Section N9.3.6b Copyright, Amit H. Varma, Purdue Univ.Continue
18 Flowchart: Design and Specs Continue11/15/13Design Process for SC Wall ConnectionsSelect full strength or overstrength connection design philosophy, anddesign force transfer mechanisms for connections as per Section N9.4.1.Calculate connection required strength for each demand type in accordance with Section N9.4.2Calculate connection available strength using Section N9.4.3Check connection required strength ≤ connection available strengthCopyright, Amit H. Varma, Purdue Univ.Check SC wall design for impactive and impulsive loads in accordance with Section N9.1.6Continue
19 Flowchart: Design and Specs Continue11/15/13Fabrication, Erection and Construction RequirementsSpecify detailing for regions around openings using Section N9.1.7Specify dimensional tolerances for fabrication of SC wall panels, sub-modules, and modules using Section N9.5Copyright, Amit H. Varma, Purdue Univ.Specify quality assurance/quality control requirements for SC walls in accordance with Section N9.6End design of structure with SC walls
20 Presentation Modules Module 1: General Provisions, Requirements, 11/15/13Module 1:General Provisions, Requirements,LimitationsCopyright, Amit H. Varma, Purdue Univ.Module 2:Analysis Requirements andRecommendationsModule 3:Shear Connectors,Local bucklingComposite Action
21 Presentation Modules (Contd.) 11/15/13Module 4:Tie BarsDesign requirementsOut-of-Plane ShearModule 6:Design Interaction equations for combined forces and momentsModule 5:Available StrengthTension, CompressionFlexure, In-Plane ShearCopyright, Amit H. Varma, Purdue Univ.Module 7:Connection Design
22 Public Access to Presentation Modules 11/15/13Varma, A.H.* (2014). “Draft Provisions on Modular Composite Construction Under Consideration by AISC N690, Appendix N9.” Presentation to the Nuclear Regulatory Commission (NRC), Public Meeting.Meeting announcement:Meeting summary:All slides and discussion notes from meeting below:Copyright, Amit H. Varma, Purdue Univ.
23 Development of an AISC DG 11/15/13Design Guide on SC Composite WallsWork initiated: May 2014First major submission for review: Oct. 2014Second major submission for review: Jan. 2015Third major submission for review: July 2015Finalization of DG: Nov. 2015Copyright, Amit H. Varma, Purdue Univ.
24 Past and Current WorkTesting of modular composite wall design for current nuclear plant designsFull-scale tests to confirm design equations and performanceScaled tests to confirm strength and ductility for earthquake loadingFull-scale tests for combined accident thermal and seismic loadingConfirmatory tests of connection behavior
25 Past and Current workNumerical simulation of modular composite structure response to seismic events, accident thermal + seismic event (Fukushima type scenario),Numerical simulation of modular structure response to aircraft impactExperimental confirmation and numerical simulation of connection behavior, performance and failure modes
26 Current workDevelopment of connection strategies and technologies for modular composite constructionSponsored by the DOE – NEET, Advanced Methods of Manufacturing programExperimental testingNumerical simulationDevelopment of design guidelines for:SC wall-to-concrete basemat anchorageSC wall-to-wall T and L connectionSC wall-to-slab connection
27 Current WorkModular composite structures subjected to accident thermal conditions and seismic loadingSponsored by DOE – NEUP Program, Advanced Methods of ManufacturingExperimental testingNumerical simulationDevelopment of design and analysis guidelinesEffects of accident thermal loading on in-plane shear behavior of SC and RC walls
28 Current WorkDesign of modular composite structures for impulsive and impactive loadingSponsored by the US NRC and DOEExperimental testing in US ACoE facilityNumerical simulationsDevelopment of design guidelinesImpulsive loading tests – conducted Oct. 2014Missile Impact tests – 2015, 2016
29 Future WorkUse of stainless steel and other corrosion resistant systems in modular composite construction for SMRsUse of curved walls in modular composite construction, particularly use of combined containment vessel and shield buildingEffects of structure-soil-structure interaction in the design of modular composite structures
30 Putting the ‘M’ in SMRs Construction schedule & success Various innovative and efficient designsProject specific testing and analysis minimizedDevelopment of ANSI approved AISC Specification and NRC regulatory guideOutline of AISC N Supp. No. 1
31 Putting the ‘M’ in SMRsNumerous testing, simulation, and design projects conducted at Purdue for current power plant designs using modular composite structures.Current Research Projects, funded by US DOE and US NRC, at Purdue to facilitate modular composite structures for SMRsChallenges overcomeMaking modularity in construction a reality …