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// CODE SNIPPET

[BS] A112.2 In-Plane Shear of Unreinforced Masonry Walls

California Existing Building Code 2019 > A Guidelines for the Seismic Retrofit of Existing Buildings > A112 Analysis and Design > A112.2 In-Plane Shear of Unreinforced Masonry Walls
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[BS] A112.2.1 Flexural Rigidity

Flexural components of deflection need not be considered in determining the rigidity of an unreinforced masonry wall.

[BS] A112.2.2 Shear Walls With Openings

Wall piers shall be analyzed according to the following procedure, which is diagrammed in Figure A112.2.2.
  1. For any pier,
    1. 1.1. The pier shear capacity shall be calculated as:
      (Equation A1-18)
      where:
      An = area of net mortared or grouted section of a wall or wall pier.
    2. 1.2. The pier rocking shear capacity shall be calculated as:
      (Equation A1-19)
  2. The wall piers at any level are acceptable if they comply with one of the following modes of behavior:
    1. 2.1. Rocking controlled mode. Where the pier rocking shear capacity is less than the pier shear capacity, in other words, Vr < va, for each pier in a level, forces in the wall at that level, Vwx, shall be distributed to each pier in proportion to PDD/H.
      For the wall at that level:
      (Equation A1-20)
    2. 2.2. Shear controlled mode. Where the pier shear capacity is less than the pier rocking capacity, in other words, va < Vr in one or more pier(s) in a level, forces in the wall at the level, Vwx, shall be distributed to each pier in proportion to D/H.
      For each pier at that level:
      (Equation A1-21)
      and
      (Equation A1-22)
      If Vp < va for each pier and Vp > Vr for one or more piers, such piers shall be omitted from the analysis, and the procedure shall be repeated for the remaining piers, unless the wall is strengthened and reanalyzed.
  3. Masonry pier tension stress. Unreinforced masonry wall piers need not be analyzed for tension stress.
[BS] FIGURE A112.2.2
ANALYSIS OF URM WALL IN-PLANE SHEAR FORCES

[BS] A112.2.3 Shear Walls Without Openings

Shear walls without openings shall be analyzed the same as for walls with openings, except that Vr shall be calculated as follows:
(Equation A1-23)

Related Code Sections


A112.2 Guidelines for the Seismic Retrofit of Existing Buildings, In-Plane Shear of Unreinforced Masonry Walls
OF URM WALL IN-PLANE SHEAR FORCES Shear walls ...
California Existing Building Code 2019 > A Guidelines for the Seismic Retrofit of Existing Buildings > A112 Analysis and Design > A112.2 In-Plane Shear of Unreinforced Masonry Walls
5.4 Seismic Evaluation Procedures for Hospital Buildings, Unreinforced Masonry Shear Walls
following provisions apply to unreinforced masonry shear wall structures that also possess a complete vertical load-carrying space frame ...
California Administrative Code 2016 > 6 Seismic Evaluation Procedures for Hospital Buildings > 5 Procedures for Shear Walls > 5.4 Unreinforced Masonry Shear Walls
5.4 Seismic Evaluation Procedures for Hospital Buildings, Unreinforced Masonry Shear Walls
1.4.5.1.2. The following provisions apply to unreinforced masonry shear wall structures that also possess a complete vertical load-carrying space frame ...
California Administrative Code 2019 > 6 Seismic Evaluation Procedures for Hospital Buildings > 5 Procedures for Shear Walls > 5.4 Unreinforced Masonry Shear Walls
A106.2 Guidelines for the Seismic Retrofit of Existing Buildings, Existing Unreinforced Masonry
Unreinforced masonry walls used to support vertical loads or seismic forces parallel and perpendicular to the wall plane shall be tested as specified ...
California Existing Building Code 2019 > A Guidelines for the Seismic Retrofit of Existing Buildings > A106 Materials Requirements > A106.2 Existing Unreinforced Masonry
A106.3 Guidelines for the Seismic Retrofit of Existing Buildings, Existing Unreinforced Masonry
Unreinforced masonry walls used to carry vertical loads or seismic forces parallel and perpendicular to the wall plane shall be tested as specified ...
California Existing Building Code 2016 > A Guidelines for the Seismic Retrofit of Existing Buildings > A106 Materials Requirements > A106.3 Existing Unreinforced Masonry
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