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AISC N690: A PPENDIX N9 Design of Steel-Plate Composite (SC) Walls By, Amit H. Varma University 11/15/13 Copyright, Amit H. Varma, Purdue Univ. 1.

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Presentation on theme: "AISC N690: A PPENDIX N9 Design of Steel-Plate Composite (SC) Walls By, Amit H. Varma University 11/15/13 Copyright, Amit H. Varma, Purdue Univ. 1."— Presentation transcript:

1 AISC N690: A PPENDIX N9 Design of Steel-Plate Composite (SC) Walls By, Amit H. Varma University 11/15/13 Copyright, Amit H. Varma, Purdue Univ. 1

2 O UTLINE  Specification for Steel-Plate Composite Structures  Layout and Organization of N690 Appendix N9  Presentation Modules and Links  Ongoing Work 11/15/13 Copyright, Amit H. Varma, Purdue Univ. 2

3 O BJECTIVE  Specification for steel-plate composite SC walls in safety-related nuclear facilities  Use with AISC N690 – LRFD code  Instead of ACI 349 code for concrete structures for nuclear facilities  but all topics covered  Specification for SC walls and associated connections 11/15/13 Copyright, Amit H. Varma, Purdue Univ. 3

4 P ATH F ORWARD  Develop industry consensus standard for modular composite construction  NRC review standard and publish regulatory guide  AISC N690-12: Specification for design of steel structures for safety-related nuclear facilities  AISC TC12 – established ad-hoc sub-committee for modular composite construction  First Meeting Nov. 2006

5 P ATH F ORWARD  Sub-committee for modular composite construction  Has 20 active members  First Meeting Nov  Conducted a total of 164 meetings and numerous conference calls  Attendees include guests from a variety of institutions as well as international participation

6 S CHEDULE  Schedule for completion  Ballot 1 – Nov  Ballot 2 – June 2014 with public review comments  Ballot 3 – Nov with public review comments  Ballot 4 – Jan with final public review comments  ANSI approved standard

7 S CHEDULE  US NRC has started the review process using the public review ballot no. 2  Regulatory Guide based on N has been initiated, number allocated.  NRC position on the ANSI approved standard should come shortly after.

8 L AYOUT AND O RGANIZATION OF A PP N9  N Specification Additions  NA3 – Materials  NB2 – Loads and Load Combinations  Add F and H, and tread them like D and L (ACI 349)  NM2 – Fabrication, Erection, and Construction  Dimensional Tolerances  Minimum Requirements for Inspection of Composite Constructions 11/15/13 Copyright, Amit H. Varma, Purdue Univ. 8

9 L AYOUT AND O RGANIZATION OF A PP N9  N9.1 Design Requirements  N9.1.1 General Provisions  N9.1.2 Design Basis  N9.1.2a Required Strength  N9.1.2b Design for Stability  N9.1.3 Compactness Requirement  N9.1.4 Requirements for Composite Action  N9.1.4a Classification of Shear Connectors  N9.1.4b Spacing of Shear Connectors  N9.1.5 Tie Requirements  N9.1.5a Classification of Ties  N9.1.5b Required Tension Strength for Ties 11/15/13 Copyright, Amit H. Varma, Purdue Univ. 9

10 L AYOUT AND O RGANIZATION OF A PP N9  N9.1 Design Requirements (cont’)  N9.1.6 Design for Impulsive and Impactive Loads  N9.1.6a Definition of Loads  N9.1.6b Dynamic Increase Factors  N9.1.6c Ductility Ratios  N9.1.6d Response Determination  N9.1.7 Design and Detailing Around Opening  N9.1.7a Design and Detailing Requirements Around Small Openings  N9.1.7b Design and Detailing Requirements Around Large Openings 11/15/13 Copyright, Amit H. Varma, Purdue Univ. 10

11 L AYOUT AND O RGANIZATION OF A PP N9  N9.2 Analysis Requirements  N9.2.1 General Provisions  N9.2.2 Effective Stiffness for Analysis  N9.2.3 Geometric and Material Properties for Finite Element Analysis  N9.2.4 Analyses Involving Accidental Thermal Conditions  N9.2.5 Determination of Required Strengths 11/15/13 Copyright, Amit H. Varma, Purdue Univ. 11

12 L AYOUT AND O RGANIZATION OF A PP N9  N9.3 Design of SC Walls  N9.3.1 Uniaxial Tensile Strength  N9.3.2 Compressive Strength  N9.3.3 Out-of-Plane Flexural Strength  N9.3.4 In-Plane Shear Strength  N9.3.5 Out-of-Plane Shear Strength  N9.3.6 Strength Under Combined Forces  N9.3.6a Out-of-Plane Shear Forces  N9.3.6b In-Plane Membrane Forces and Out-of-Plane Moments 11/15/13 Copyright, Amit H. Varma, Purdue Univ. 12

13 L AYOUT AND O RGANIZATION OF A PP N9  N9.4 Design of SC Wall Connections  N9.4.1 General Provisions  N9.4.2 Required Strength  N9.4.3 Available Strength 11/15/13 Copyright, Amit H. Varma, Purdue Univ. 13

14 F LOWCHART : D ESIGN AND S PECS No Yes Are the requirements of N9.1.1 satisfied? Appendix N9 is not applicable. (Refer to Commentary for alternate methods) Begin design of structure with SC walls 1.Check that SC section thickness, reinforcement ratio, faceplate thickness, steel and concrete grades satisfy the limitations of Section N Check that applicable requirements of Section N9.1.1 are satisfied. Continue 11/15/13 Copyright, Amit H. Varma, Purdue Univ. 14

15 F LOWCHART : D ESIGN AND S PECS Check that faceplate is compact (Section N9.1.3) Provide composite action using shear connectors Classify connectors as yielding or nonyielding type using Section N9.1.4a. Check spacing of shear connectors using Section N9.1.4b Provide structural integrity using ties Check tie spacing using Section N Check tie spacing in regions around openings using Section N 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 N9.3.5 Calculate minimum required tension strength for ties using Section N9.1.5b. Continue 11/15/13 Copyright, Amit H. Varma, Purdue Univ. 15

16 F LOWCHART : D ESIGN AND S PECS Develop linear elastic finite element (LEFE) model according to Sections N9.2.1 and N9.2.3 Analyze LEFE model for load and load combinations from Section NB2. Model openings using Section N Model flexural and shear stiffness of SC walls using Section N Loading due to accidental thermal conditions will be as per Section N Model second-order effects using Section N9.1.2b Continue Perform LEFE analysis to calculate design demands and required strengths. Identify interior and connection regions using Section N9.1.2 Calculate required strengths for each demand type using SectionN9.2.5 Continue 11/15/13 Copyright, Amit H. Varma, Purdue Univ. 16

17 F LOWCHART : D ESIGN AND S PECS Design Process for SC Walls: Required strengths ≤ Available strengths Calculate available strengths for each demand type using Section N9.3. The sub-sections are: Available uniaxial tensile strength using Section N9.3.1 Available compressive strength using Section N9.3.2 Available out-of-plane flexural strength using Section N9.3.3 Available in-plane shear strength using Section N9.3.4 Available out-of-plane shear strength using Section N9.3.5 Check available strength for combined forces using Section N9.3.6 Combined out-of-plane shear demands using Section N9.3.6a Combined in-plane membrane forces and out-of-plane moments using Section N9.3.6b Continue 11/15/13 Copyright, Amit H. Varma, Purdue Univ. 17

18 F LOWCHART : D ESIGN AND S PECS Continue Design Process for SC Wall Connections Select full strength or overstrength connection design philosophy, and design force transfer mechanisms for connections as per Section N Calculate connection required strength for each demand type in accordance with Section N9.4.2 Calculate connection available strength using Section N9.4.3 Check connection required strength ≤ connection available strength Check SC wall design for impactive and impulsive loads in accordance with Section N /15/13 Copyright, Amit H. Varma, Purdue Univ. 18

19 F LOWCHART : D ESIGN AND S PECS Fabrication, Erection and Construction Requirements 1.Specify detailing for regions around openings using Section N Specify dimensional tolerances for fabrication of SC wall panels, sub-modules, and modules using Section N9.5 Specify quality assurance/quality control requirements for SC walls in accordance with Section N9.6 End design of structure with SC walls Continue 11/15/13 Copyright, Amit H. Varma, Purdue Univ. 19

20 P RESENTATION M ODULES Module 1: General Provisions, Requirements, Limitations Module 2: Analysis Requirements and Recommendations Module 3: Shear Connectors, Local buckling Composite Action 11/15/13 Copyright, Amit H. Varma, Purdue Univ. 20

21 P RESENTATION M ODULES (C ONTD.) Module 4: Tie Bars Design requirements Out-of-Plane Shear Module 5: Available Strength Tension, Compression Flexure, In-Plane Shear Module 7: Connection Design Module 6: Design Interaction equations for combined forces and moments 11/15/13 Copyright, Amit H. Varma, Purdue Univ. 21

22 P UBLIC A CCESS TO P RESENTATION M ODULES  Varma, 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: 234  Meeting summary:  All slides and discussion notes from meeting below: 11/15/13 22 Copyright, Amit H. Varma, Purdue Univ.

23 D EVELOPMENT OF AN AISC DG  Design Guide on SC Composite Walls  Work initiated: May 2014  First major submission for review: Oct  Second major submission for review: Jan  Third major submission for review: July 2015  Finalization of DG: Nov /15/13 23 Copyright, Amit H. Varma, Purdue Univ.

24 P AST AND C URRENT W ORK  Testing of modular composite wall design for current nuclear plant designs  Full-scale tests to confirm design equations and performance  Scaled tests to confirm strength and ductility for earthquake loading  Full-scale tests for combined accident thermal and seismic loading  Confirmatory tests of connection behavior

25 P AST AND C URRENT WORK  Numerical simulation of modular composite structure response to seismic events, accident thermal + seismic event (Fukushima type scenario),  Numerical simulation of modular structure response to aircraft impact  Experimental confirmation and numerical simulation of connection behavior, performance and failure modes

26 C URRENT WORK  Development of connection strategies and technologies for modular composite construction  Sponsored by the DOE – NEET, Advanced Methods of Manufacturing program  Experimental testing  Numerical simulation  Development of design guidelines for:  SC wall-to-concrete basemat anchorage  SC wall-to-wall T and L connection  SC wall-to-slab connection

27 C URRENT W ORK  Modular composite structures subjected to accident thermal conditions and seismic loading  Sponsored by DOE – NEUP Program, Advanced Methods of Manufacturing  Experimental testing  Numerical simulation  Development of design and analysis guidelines  Effects of accident thermal loading on in-plane shear behavior of SC and RC walls

28 C URRENT W ORK  Design of modular composite structures for impulsive and impactive loading  Sponsored by the US NRC and DOE  Experimental testing in US ACoE facility  Numerical simulations  Development of design guidelines  Impulsive loading tests – conducted Oct  Missile Impact tests – 2015, 2016

29 F UTURE W ORK  Use of stainless steel and other corrosion resistant systems in modular composite construction for SMRs  Use of curved walls in modular composite construction, particularly use of combined containment vessel and shield building  Effects of structure-soil-structure interaction in the design of modular composite structures

30 P UTTING THE ‘M’ IN SMR S  Construction schedule & success  Various innovative and efficient designs  Project specific testing and analysis minimized  Development of ANSI approved AISC Specification and NRC regulatory guide  Outline of AISC N Supp. No. 1

31 P UTTING THE ‘M’ IN SMR S  Numerous 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 SMRs  Challenges overcome  Making modularity in construction a reality …


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