Cover [PDF]

Standards [PDF]

Foreword [PDF]

Acknowledgements [PDF]

Dedication [PDF]

Contents [PDF]

Chapter 1 General

Chapter 2 Combinations of Loads

Chapter 3 Dead Loads, Soil Loads, and Hydrostatic Pressure

Chapter 4 Live Loads

Chapter 5 Flood Loads

Chapter 6 Reserved for Future Provisions

Chapter 7 Snow Loads

Chapter 8 Rain Loads

Chapter 9 Reserved for Future Provisions

Chapter 10 Ice Loads - Atmospheric Icing

Chapter 11 Seismic Design Criteria

Chapter 12 Seismic Design Requirements for Building Structures

Chapter 13 Seismic Design Requirements for Nonstructural Components

Chapter 14 Material Specific Seismic Design and Detailing Requirements

Chapter 15 Seismic Design Requirements for Nonbuilding Structures

Chapter 16 Seismic Response History Procedures

Chapter 17 Seismic Design Requirements for Seismically Isolated Structures

Chapter 18 Seismic Design Requirements for Structures with Damping Systems

Chapter 19 Soil-Structure Interaction for Seismic Design

Chapter 20 Site Classification Procedure for Seismic Design

Chapter 21 Site-Specific Ground Motion Procedures for Seismic Design

Chapter 22 Seismic Ground Motion Long-Period Transition and Risk Coefficient Maps

Chapter 23 Seismic Design Reference Documents

Chapter 24

Chapter 25

Chapter 26 Wind Loads: General Requirements

Chapter 27 Wind Loads on Buildings‒MWFRS (Directional Procedure)

Chapter 28 Wind Loads on Buildings‒MWFRS (Envelope Procedure)

Chapter 29 Wind Loads on Other Structures and Building Appurtenances‒MWFRS

Chapter 30 Wind Loads ‒ Components and Cladding (C&C)

Chapter 31 Wind Tunnel Procedure

Appendix 11A Quality Assurance Provisions

Appendix 11B Existing Building Provisions

Appendix C Serviceability Considerations

Appendix D Buildings Exempted from Torisional Wind Load Cases

This section provides minimum requirements for quality assurance for seismic force-resisting systems and other designated seismic systems. These requirements are not directly related to computation of earthquake loads, but they are deemed essential for satisfactory performance in an earthquake where designing with the loads determined in accordance with this standard, due to the substantial cyclic inelastic strain capacity assumed to exist by the load procedures in this standard. The requirements contained in this appendix supplement the testing and inspection requirements contained in the reference documents given in Chapters 13 and 14 and form an integral part of Chapters 11 through 23.
As a minimum, the quality assurance provisions apply to the following:
  1. The seismic force-resisting systems in structures assigned to Seismic Design Categories C, D, E, or F.

         EXCEPTION: Requirements for the seismic force-resisting system may be excluded for steel systems in structures assigned to Seismic Design Category C that are not specifically detailed for seismic resistance, with a response modification coefficient, R, of 3. Cantilever column systems are not included in this exception.
  2. Mechanical and electrical components as specified in Section 11A.1.3.10.
  3. Designated seismic systems in structures assigned to Seismic Design Categories D, E, or F.

         EXCEPTIONS: Structures that comply with the following criteria are exempt from the preparation of a quality assurance plan, but those structures are not exempt from special inspection(s) or testing requirements:
    1. The structure is of light-frame construction, SDS does not exceed 0.50, the height of the structure does not exceed 35 ft (10.7 m) above grade , and the structure meets the requirements in items c and d in the following text.
    2. The structure is constructed using a reinforced masonry structural system or reinforced concrete structural system, SDS does not exceed 0.50, the height of the structure does not exceed 25 ft above grade , and the structure meets the requirements in items c and d in the following text.
    3. The structure is classified as Occupancy Category I or II.
    4. The structure does not have any of the following irregularities as defined in Table 12.3-1 or 12.3-2:
      1. Torsional irregularity,
      2. Extreme torsional irregularity,
      3. Nonparallel systems irregularity,
      4. Stiffness-soft story irregularity,
      5. Stiffness-extreme soft story irregularity,
      6. Discontinuity in lateral strength-weak story irregularity, and
      7. Discontinuity in lateral strength-extreme weak story.
A quality assurance plan shall be submitted to the authority having jurisdiction.
The quality assurance plan shall specify the designated seismic systems or seismic force-resisting system in accordance with Section 11A.1.1 that are subject to quality assurance. The registered design professional in charge of the design of a seismic force-resisting system and a designated seismic system shall be responsible for the portion of the quality assurance plan applicable to that system. The special inspections and special tests needed to establish that the construction is in conformance with this standard shall be included in the portion of the quality assurance plan applicable to the designated seismic system. The quality assurance plan shall include
  1. The seismic force-resisting systems and designated seismic systems in accordance with this appendix that are subject to quality assurance,
  2. The special inspections and testing to be provided as required by this standard and the reference documents in Chapter 23,
  3. The type and frequency of testing,
  4. The type and frequency of special inspections,
  5. The frequency and distribution of testing and special inspection reports,
  6. The structural observations to be performed, and
  7. The frequency and distribution of structural observation reports.
Each contractor responsible for the construction of a seismic force-resisting system, designated seismic system , or component listed in the quality assurance plan shall submit a written contractor's statement of responsibility to the regulatory authority having jurisdiction and to the owner prior to the commencement of work on the system or component. The contractor's statement of responsibility shall contain the following:
  1. Acknowledgment of awareness of the special requirements contained in the quality assurance plan;
  2. Acknowledgment that control will be exercised to obtain conformance with the design documents approved by the authority having jurisdiction;
  3. Procedures for exercising control within the contractor's organization, the method and frequency of reporting, and the distribution of the reports; and
  4. Identification and qualifications of the person(s) exercising such control and their position(s) in the organization.
The building owner shall employ a special inspector(s) to observe the construction of all designated seismic systems in accordance with the quality assurance plan for the following construction work. The authority having jurisdiction shall have the option to approve the quality assurance personnel of a fabricator as a special inspector. The person in charge of the special inspector(s) and the testing services shall be a registered design professional.
Periodic special inspection is required during the
  1. Driving of piles;
  2. Construction of drilled piles, piers, and caissons;
  3. Placement of reinforcing steel in piers, piles, caissons, and shallow foundations; and
  4. Placement of concrete in piers, piles, caissons, and shallow foundations.
Periodic special inspection during and upon completion of the placement of reinforcing steel in intermediate and special moment frames of concrete and concrete shear walls.
Continuous special inspection is required during the welding of reinforcing steel resisting flexural and axial forces in intermediate and special moment frames of concrete, in boundary members of concrete shear walls, and welding of shear reinforcement.
Periodic special inspection is required during and on completion of the placement of concrete in intermediate and special moment frames and in boundary members of concrete shear walls.
Periodic special inspection during the placement and after the completion of placement of prestressing steel and continuous special inspection is required during all stressing and grouting operations and during the placement of concrete.
Periodic special inspection is required during the preparation of mortar, the laying of masonry units, the placement of reinforcement, and prior to placement of grout.
Continuous special inspection is required during welding of reinforcement, grouting, consolidation, and reconsolidation and placement of bent-bar anchors as required by Section 14.4.
Special inspection for structural steel shall be in accordance with the quality assurance plan requirements of AISC 341.
Continuous special inspection is required during all field-gluing operations of elements of the seismic force-resisting system.
Periodic special inspection is required for nailing, bolting, anchoring, and other fastening of components within the seismic force-resisting system including drag struts, braces, and hold-downs.
Periodic special inspections for nailing and other fastening of wood sheathing used for wood shear walls, shear panels, and diaphragms where the required fastener spacing is 4 in. or less that are included in the seismic force-resisting system.
Periodic special inspection is required during all welding operations of elements of the seismic force-resisting system.
Periodic special inspection is required for screw attachment, bolting, anchoring, and other fastening of components within the seismic force-resisting system, including struts, braces, and hold-downs.
Special inspection for architectural components shall be as follows:
  1. Periodic special inspection during the erection and fastening of exterior cladding, interior and exterior nonbearing walls, and interior and exterior veneer in structures assigned to Seismic Design Categories D, E, or F.

              EXCEPTIONS:

    1. Architectural components less than 30 ft (9 m) above grade or walking surface.
    2. Cladding and veneer weighing 5 lb/ft2 (239 N/m2) or less.
    3. Interior nonbearing walls weighing 15 lb/ft2 (718 N/m2) or less.
  2. Periodic special inspection during the anchorage of access floors and the installation of suspended ceiling grids, and storage racks 8 ft (2.5 m) or greater in height in structures assigned to Seismic Design Categories D, E, or F.
  3. Periodic special inspection during erection of glass 30 ft (9 m) or more above an adjacent grade or walking surface in glazed curtain walls, glazed storefronts, and interior glazed partitions in structures assigned to Seismic Design Categories D, E, or F.
Special inspection for mechanical and electrical components shall be as follows:
  1. Periodic special inspection during the anchorage of electrical equipment for emergency or standby power systems in structures assigned to Seismic Design Categories C, D, E, or F.
  2. Periodic special inspection during the installation of anchorage of all other electrical equipment in Seismic Design Categories E or F.
  3. Periodic special inspection during the installation for flammable, combustible, or highly toxic piping systems and their associated mechanical units in Seismic Design Categories C, D, E, or F.
  4. Periodic special inspection during the installation of HVAC ductwork that will contain hazardous materials in Seismic Design Categories C, D, E, or F.
  5. Periodic special inspection during the installation of vibration-isolation systems where the construction documents indicate a maximum clearance (air gap) between the equipment support frame and restraint less than or equal to 1/4 in.
Periodic special inspection is required during the fabrication and installation of isolator units and energy dissipation devices if used as part of the seismic isolation system.
The special inspector(s) shall be responsible for verifying that the special test requirements are performed by an approved testing agency for the types of work in designated seismic systems listed in the following text.
Special testing of reinforcing and prestressing steel shall be as follows:
Examine certified mill test reports for each shipment of reinforcing steel used to resist flexural and axial forces in reinforced concrete intermediate and special moment frames and boundary members of reinforced concrete shear walls or reinforced masonry shear walls and determine conformance with construction documents.
Where ASTM A615 reinforcing steel is used to resist earthquake-induced flexural and axial forces in special moment frames and in wall boundary elements of shear walls in structures assigned to Seismic Design Categories D, E, or F, verify that the requirements of Section 21.2.5.1 of ACI 318 have been satisfied.
Where ASTM A615 reinforcing steel is to be welded, verify that chemical tests have been performed to determine weldability in accordance with Section 3.5.2 of ACI 318.
Samples of structural concrete shall be obtained at the project site and tested in accordance with requirements of Section 5.6 of ACI 318.
Quality assurance testing of structural masonry shall be in accordance with the requirements of ACI 530/ASCE 5/TMS 402 or ACI 530.1/ASCE 6/TMS 602.
Testing for structural steel shall be in accordance with the quality assurance plan requirements of AISC 341.
For required system tests, see Section 17.8.
The special inspector shall examine mechanical and electrical equipment that is a designated seismic system and shall determine whether its anchorages and label conform with the certificate of compliance.
Structural observations shall be provided for those structures included in Seismic Design Categories D, E, or F where one or more of the following conditions exist:
  1. The structure is included in Occupancy Category III or IV.
  2. The height of the structure is greater than 75 ft (22.9 m) above the base.
  3. The structure is assigned to Seismic Design Category E and Occupancy Category I or II and is greater than two stories in height.
     Structural observations shall be performed by a registered design professional. Observed deficiencies shall be reported in writing to the owner and the authority having jurisdiction.
Each special inspector shall furnish to the authority having jurisdiction, registered design professional in responsible charge, the owner, the persons preparing the quality assurance plan, and the contractor copies of regular weekly progress reports of his or her observations, noting therein any uncorrected deficiencies and corrections of previously reported deficiencies. All deficiencies shall be brought to the immediate attention of the contractor for correction. At completion of construction, each special inspector shall submit a final report to the authority having jurisdiction certifying that all inspected work was completed substantially in accordance with approved construction documents. Work not in compliance shall be described in the final report. At completion of construction, the building contractor shall submit a final report to the authority having jurisdiction certifying that all construction work incorporated into the seismic force-resisting system and other designated seismic systems was constructed substantially in accordance with the approved construction documents and applicable workmanship requirements. Work not in compliance shall be described in the final report. The contractor shall correct all deficiencies as required.
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