2018 IBC STRUCTURAL UPDATES

2018 IBC STRUCTURAL UPDATES
SNICC/SEASoN JOINT MEETING By Gerald Gunny, P.E., S.E.

2018 CONSTRUCTION CODE ADOPTION

Where can I find the Southern Nevada Building Code Amendments to the 2018 I-codes? Click here

ROADMAP General overview of the structural changes and updates to the 2018 IBC and the Southern Nevada Amendments to the 2018 IBC

ROADMAP

2018 IBC EFFECTIVE DATE FEBRUARY 4, 2019
Contact each specific jurisdiction (AHJ) for exceptions

2018 IBC STRUCTURAL UPDATES
vs Tale of the Tape $837 $1017 *Source: ICC Bookstore

What will be the major changes with the 2018 IBC?

2018 IBC STRUCTURAL CHANGES
All new referenced standards

All new referenced standards ASCE 7-16, Design Loads (Chapter 16) ACI , Concrete (Chapter 19) TMS 402/602-16, Masonry (Chapter 21) AISC , Steel (Chapter 22) AISC , Seismic Provisions for Steel (Chapter 22) AISI S100-16, Cold-formed Steel (Chapter 22) AWC NDS-18, Wood (Chapter 23) AWC SDPWS-15, Wind and Seismic for Wood (Ch. 23)

All new referenced standards TIA 222-H-16 Tower Structures (Chapters 16 and 31) RMI ANSI/MH , Steel Storage Racks (Chapter 22) RMI ANSI/MH , Cantilevered Steel Storage Racks (Chapter 22) – New Standard SJI CJ-16 Composite Steel Joists SJI Steel Joists and Girders SDI C-17, SDI NC-17, SDI RD-17 Steel Decks

QUIZ QUESTION: If there is a code conflict between the IBC (base code) and a referenced standard, which one will govern? ANSWER: In general, the provisions of the IBC (base code) shall apply. However, some administrative codes require the most restrictive provision to govern.

Existing Building Structures deleted from Chapter 34 (actually deleted during the 2015 code cycle) 2018 International Existing Building Code, IEBC, now adopted The provisions that were previously in Chapter 34 now appear in the IEBC Intended to provide requirements for repair and alternative approaches for alterations and additions to existing buildings

The IEBC provides 3 main options for a designer in dealing with alterations of existing buildings However, all repairs must comply with Chapter 4 OPTION 1: PRESCRIPTIVE COMPLIANCE METHOD derived from the former Chapter 34 of the IBC OPTION 2: WORK COMPLIANCE METHOD OPTION 3: PERFORMANCE COMPLIANCE METHOD

IBC Section (Construction Documents) Construction documents for buildings constructed in accordance with the conventional light-frame construction provisions of Section 2308 shall indicate the following structural design information: 1. Floor and roof dead and live loads This was a 2018 IBC code change proposal submitted by SNICC and approved at the ICC group B code hearings! Previously a Southern Nevada Building Code Amendment now incorporated into the IBC Note only required on non-engineered construction documents that utilize the structural prescriptive provisions!

IBC SECTION 1603 Construction Documents Special loads. Special loads that are applicable to the design of the building, structure or portions thereof, including but not limited to the loads of machinery or equipment, and that are greater than specified floor and roof loads shall be specified by their descriptions and locations. Photovoltaic panel systems. The dead load of rooftop-mounted photovoltaic panel systems, including rack support systems, shall be indicated on the construction documents

IBC SECTION Risk Category Risk Category is assigned to each building or structure based upon nature of occupancy and risk associated with unacceptable performance Risk Category I - Low hazard Risk Category II - Common Risk Category III - Important Risk Category IV - Essential

IBC SECTION Risk Category Risk Category used in IBC for multiple purposes including Importance Factors used to determine the design loads for snow, seismic, ice, etc. Determination of Wind Speed Determination of Seismic Design Category Special Inspection and Structural Observation requirements

IBC SECTION Risk Category In the application of assigning the appropriate risk category for a structure, Section has been revised (2015 IBC) to clarify that where standards refer to ASCE 7 Table 1.5-1, IBC Table should be used instead. In addition, buildings of Group I-2 occupancies in Table have been revised to include condition classifications and to clarify the intent between Risk Category III and IV for these occupancies With Group I-2 occupancies having surgery or emergency treatment facilities being classified as Risk Category IV

IBC SECTION Risk Category

IBC SECTION Partition Loads Editorial change from the 2015 IBC; previously the provision was worded such that the specified live load had to be greater than 80 psf (not including 80 psf) to not include partition loading

IBC SECTION Wind and Seismic Detailing References within ASCE 7 to ASCE 7 Chapter 14 detailing requirements shall not apply except as specifically required herein

IBC SECTION 1607 Live Loads Photovoltaic panel systems. Must be designed for each of the following uniform and concentrated roof loads: Roof live load + PV system dead load Exception: Roof live loads need not be applied to the area covered by PV panels where the clear space between the panels and roof surface is 24 inches or less All applicable roof loads without the PV system

IBC SECTION 1607 Live Loads Balconies and decks (Table ) 1.5 times live load served Not required to exceed 100 psf Residential balcony live load example: 60 psf

IBC CHAPTER 1 – SCOPE AND ADMINISTRATION
Not adopted by local jurisdictions Should we dismiss it completely? Local jurisdictions have their own Administrative Code which cover most provisions in this chapter except… When new provisions are added and need to be considered

IBC CHAPTER 1 – SCOPE AND ADMINISTRATION
SOUTHERN NEVADA AMENDMENTS Local jurisdictions have their own administrative code that cover most provisions in this chapter

2018 IBC Section [A] Exterior balconies and elevated walking surfaces. Where balconies or other elevated walking surfaces are exposed to water from direct or blowing rain, snow, or irrigation, and the structural framing is protected by an impervious moisture barrier, the construction documents shall include details for all elements of the impervious moisture barrier system. The construction documents shall include manufacturer’s installation instructions.

2018 IBC Section [A] Weather-exposed balcony and walking surface waterproofing. Where balconies or other elevated walking surfaces are exposed to water from direct or blowing rain, snow or irrigation, and the structural framing is protected by an impervious moisture barrier, all elements of the impervious moisture barrier system shall not be concealed until inspected and approved. Exception: Where special inspections are provided in accordance with Section , Item 3.

2018 IBC Section Cont. For reference:

2018 IBC Chapter 23

2018 IRC Balcony/Deck Example

IBC SECTION 1607 Live Loads SOUTHERN NEVADA AMENDMENTS

IBC SECTION 1607 Live Loads Fire walls. In order to meet the structural stability requirements of Section where the structure on either side of the wall has collapsed, fire walls and their supports shall be designed to withstand a minimum horizontal allowable stress load of 5 psf.

IBC SECTION 1609 Wind Loads New Wind Speed Maps are from ASCE 7-16 and based upon Risk Category for structure Updated study of wind data across the country was completed during this last code cycle In general wind speeds away from coastal hurricane regions were reduced The most significant reduction occurs in the western states which decreased by approximately 15% Why the reductions in wind speed? More weather stations available for data collection Increased forestation and urbanization Note Wind Speed transitions on the maps vary for each Risk Category

2012 IBC WIND SPEED MAP RISK CATEGORY II BUILDINGS

2018 IBC WIND SPEED MAP RISK CATEGORY II BUILDINGS

WIND AND SEISMIC DESIGN TOOLS
2018 IBC/ASCE 7-16 WIND AND SEISMIC DESIGN TOOLS FREE! Limited free data; subscription required for seismic 

IBC SECTION 1609 Wind Loads Lower values for the Las Vegas area Wind speeds may vary across the valley! No uniform valley wind speeds Use site specific wind speed data Wind speeds given below are Ultimate 3-second gust for a given site and not constant in our valley RISK CATEGORY I – 93 MPH RISK CATEGORY II – 99 MPH RISK CATEGORY III – 105 MPH RISK CATEGORY IV – 110 MPH New in 2018 IBC separate speed maps for Risk Category III and Risk Category IV Buildings

Wind Speed Boundary Risk Category III Las Vegas Valley 105 mph 106 mph

IBC SECTION 1609 Wind Loads LOCATION: LAS VEGAS

IBC WIND DESIGN TERMINOLOGY 2018 IBC terminology for “Ultimate Design Wind Speeds” in maps replaced with “Basic Design Speeds” However speeds given are still Strength Design level Load combinations using strength design (LRFD) will use a load factor of 1.0 for wind loads (1.0W) Load combinations using allowable stress design will still reduce the design wind loads by 0.6 (0.6W) Wind speed conversion (IBC Section ), Vasd = V 0.6 Both of these speeds need to be included on Construction Documents under the Wind Design Data

IBC Wind Design Data Note the following terminology is no longer used Ultimate design wind speed, Vult Nominal design wind speed, Vasd The following terms are to be used Basic design wind speed, V Allowable stress design wind speed, Vasd

QUIZ QUESTION PART A: Convert 2018 IBC Wind Speed for Risk Category II Building in Las Vegas to allowable stress design wind speed ANSWER: Vasd = 99 mph = 77 mph QUIZ QUESTION PART B: What was the old UBC Las Vegas basic wind speed back in the day? ANSWER: 75 mph !!!!

IBC SECTION 1609 Wind Loads Note the wind speed maps in the 2018 IRC are still based upon ASCE 7-10 and are still given in “Ultimate Design Wind Speeds” The latest maps were voted down during the Public Comment hearings 2018 IBC Wind Speed Maps less than 2018 IRC Wind Speed Maps Conclusions?

IBC SECTION 1609 Wind Loads Alternate All-Heights Method Gone! Removed from IBC The argument was that since ASCE 7 includes a simplified wind load design method, a competing method is no longer needed in the IBC

IBC SECTION 1613 Seismic Loads The IBC seismic maps have been updated to match new maps in the 2015 NEHRP Provisions and ASCE 7-16 Those maps are based upon the 2014 USGS update of its National Seismic Hazard Model Sds and Sd1 changes +/- 10% most locations Up to 25% a few locations

IBC SECTION 1613 Seismic Loads Site: S Jones, Las Vegas, NV +8% -7%

IBC SECTION 1613 Seismic Loads

IBC SECTION 1613 Seismic Loads Why are there changes in the seismic design values for the Las Vegas Valley? Research conducted by the Nevada Bureau of Mines and Geology indicates higher slip rate for the Eglington fault in the Las Vegas Valley Much higher than the 0.1 mm/yr used in the 2008 National Seismic Map

IBC SECTION 1613 Seismic Loads The Nevada Bureau of Mines and Geology petitioned the USGS to increase the slip rate of this fault in their earthquake source modeling Especially considering its location within a major population Research supports slip rate of 0.25 to 0.9 mm/yr with a preferred value of 0.6 mm/yr These considerations were included in the 2014 USGS update to its National Seismic Hazard Model and thus increased the seismic design values in the Las Vegas Valley

IBC SECTION 1613 EARTHQUAKE LOADS SOUTHERN NEVADA AMENDMENTS SNBCA regarding site class definitions used for seismic design requires that mapped values from the Clark County Shear Wave Velocity Profile Map or the City of Henderson Seismic Site Class Map cannot be used to determine the site class for High-Rise Buildings

IBC SECTION 1616 STRUCTURAL INTEGRITY Structural Integrity detailing for High-Rise Buildings assigned to Risk Category III and IV.

IBC CHAPTER 17 Special Inspections SOUTHERN NEVADA AMENDMENTS

IBC CHAPTER 17 Special Inspections This was a 2018 IBC code change proposal submitted by SNICC and approved at the ICC group B code hearings! Previously a Southern Nevada Building Code Amendment now incorporated into the IBC

IBC CHAPTER 17 Special Inspections IBC Section Metal-plate-connected wood trusses Added the requirement for special inspection for the proper installation of permanent bracing per approved truss submittal package when height of truss ≥ 60 inches in addition to wood trusses with clear span ≥ 60 feet REVISED IN ERRATA

IBC CHAPTER 17 Special Inspections

IBC CHAPTER 17 Special Inspections IBC Section Metal-plate-connected wood trusses Consider a 4:12 sloped roof…this would require Special Inspections for all spans  30 feet!!!

IBC CHAPTER 17 Special Inspections IBC Section Plumbing, mechanical and electrical components In Seismic Design Category C-F: Added provisions requiring periodic special inspections to verify minimum clearances for Fire Sprinkler Components in accordance with ASCE 7 (3 inches in all directions) Not required for flexible sprinkler hose fittings

IBC CHAPTER 17 Special Inspections IBC Section Fire-resistant penetrations and joints Special inspections required for fire-resistant penetrations and joints in all high-rise buildings or in buildings assigned to Risk Category III or IV.

IBC CHAPTER 18 Soils and Foundations SOUTHERN NEVADA AMENDMENTS Section Investigations required. Project geotechnical report required for all projects that require new foundations Two new exceptions added and increase of exempted height for retaining walls to match SNBCA

IBC CHAPTER 18 Soils and Foundations SOUTHERN NEVADA AMENDMENTS Section Investigations required. All projects exempted shall assume the following For retaining walls exempted shall assume the following

IBC CHAPTER 18 Soils and Foundations Section Design lateral soil loads Clarified that seismic earth pressures must be considered for Seismic Design Category D-F and supporting more than 6 feet of soils in accordance with the geotechnical investigation

IBC CHAPTER 18 Soils and Foundations Section Design lateral soil loads Note SNBCA Section regarding Seismic load due to lateral earth pressure requires all basement, foundation and retaining walls in Seismic Design Category D-F shall be designed to resist the seismic load due to the lateral earth pressure

IBC CHAPTER 18 Soils and Foundations SOUTHERN NEVADA AMENDMENTS Section Retaining Wall Safety Factor This was a 2018 IBC code change proposal submitted by SNICC

2018 IBC Chapter 2 - Definitions

IBC CHAPTER 18 Soils and Foundations SOUTHERN NEVADA AMENDMENTS Section Retaining Wall Safety Factor Voted down at the initial ICC Group B code hearings but brought back, modified and approved at the Public Comment Hearings! Ultimately voted down and disapproved at the Final Action hearings 

ASCE 7-16 Minimum Design Loads

ASCE 7-16 SEISMIC LOAD CHANGES
Site-Specific Ground Motion Procedures Required for design of structures at softer soil sites and stronger ground motion intensities Shortcomings associated with the use of seismic forces based on only two response periods

ASCE 7-16 SEISMIC LOAD CHANGES
Site specific site response analysis in accordance with Section required where: Site Class D, E and S1 > 0.2g Exceptions Site Class D, Cs = Sds/(R/I) for values of T ≤ 1.5 Ts Cs factored by 1.5 for T > 1.5Ts Note exceptions effectively limits the requirements for site-specific hazard analysis to very tall and or flexible structures at site class D sites Future editions of ASCE 7 may incorporate multiperiod MCER response spectra to eliminate these shortcomings See ASCE 7-16 commentary for more information

ASCE 7-16 WIND LOAD CHANGES
Velocity Pressure qz = KzKztKdKeV2 (psf) New factor added to equation Ke = ground elevation factor At high altitude locations wind pressures can be reduced considering density altitude

Chapter 30: Components and Cladding New Roof Pressure Coefficients (h < 60 feet), GCp New Roof Zoning Procedures more dependent upon building height, h

New Wind Load Provisions for Rooftop Solar Panels (Chapter 29) and attached Canopies on Buildings (Section 30.11)

Chapter 21 – Masonry New Reference Standard TMS Previously termed MSJC, ACI 530, ASCE 5/6 New Section 2114 for Dry-Stack Masonry Design shall comply with TMS 402 Prohibited in Risk Category IV structures

TMS 402-16 Building Code for Masonry Structures
Standard solely sponsored by The Masonry Society (TMS) Six pages less than the 2013 edition! TMS 402 will be on a six-year code cycle; next edition will be in 2022 Addition of shear friction provisions to address possibility of sliding at base due to earthquake loading Updates to anchor bolt design that will provide greater capacity for anchors loaded in combined shear and tension and increase in shear strength of anchor bolts based on crushing capacity of masonry

ACI 318-14 Code Requirements for Structural Concrete
Complete reorganization!!! ACI 318 framework remained unchanged from through 8 editions “Cookbook” member design format Eliminate the need to flip through several chapters to design a member Anchoring to Concrete moved from Appendix D to it’s own Chapter 17 Strut-and-Tie Models also moved from Appendix A to Chapter 23

AISC 341-16 Seismic Provisions
New material specifications Use of steel braced diaphragms New column splice details Requirements for SCBF gusset plate welds Application of demands on columns that participate in intersecting frames New provisions for design of multi-tier braced frames New provisions for composite shear wall systems

AISC 341-16 Seismic Provisions

Chapter 23 – Wood New referenced standards 2018 AWC NDS for Design of Wood Construction 2015 AWC SDPWS for Wind and Seismic Design of Wood Construction IBC Section For Fire-retardant treated wood treatment shall be an integral part of the manufacturing process and the use of paints, coating, stains or other surface treatments is not an approved method of protection IBC Section specifies minimum bending strength for staple fasteners

AWC NDS 2018 National Design Specification (NDS) for Wood Construction Incorporation of cross-laminated timber (CLT) in several chapters of the NDS including a new chapter specific to CLT (2015 NDS) Inclusion of char rates for CLT and structural composite lumber Changes to fastener design in response to significant increases in Components and Cladding (C&C) roof wind pressures in ASCE 7-16

AWC SDPWS-2015 Special Design Provisions for Wind and Seismic Contains provisions for design of wood members, fasteners and assemblies to resist wind and seismic forces Updates Added sections on seismic detailing and terminology consistent with ASCE 7 Increased limitations for Open Front Structures with cantilevered diaphragms Expanded applicability of the wall stud repetitive member factor, Cr, for calculating stud out-of-plane deflection

AWC SDPWS-2015 Special Design Provisions for Wind and Seismic Expanded applicability of the wall stud repetitive member factor for calculating stud out-of-plane deflection Note Wall Stud Repetitive Member Factor cannot be combined with the NDS Repetitive Member Factor, Cr

Thank you!!! See you later!!!

2018 IBC Section Relocatable buildings. Construction documents for relocatable buildings shall comply with Section 3113. Does not apply to manufactured housing used as dwellings Only applies to newly constructed buildings

2018 IBC Section 302.1 302.1 Occupancy Classification
Occupied roofs shall be classified in the group that the occupancy most nearly resembles…

2018 IBC Chapter 3 – Greenhouses
Assembly, Mercantile or Utility Group U when not classified as another occupancy

2018 IBC STRUCTURAL UPDATES

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