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// CODE SNIPPET

A112.2 Existing Unreinforced Masonry Walls

2015 IEBC portion of the 2018 CT State Building Code > A1 Seismic Strengthening Provisions for Unreinforced Masonry Bearing Wall Buildings > A112 Analysis and Design > A112.2 Existing Unreinforced Masonry Walls
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A112.2.1 Flexural Rigidity

Flexural components of deflection may be neglected in determining the rigidity of an unreinforced masonry wall.

A112.2.2 Shear Walls With Openings

Wall piers shall be analyzed according to the following procedure, which is diagrammed in Figure A1-2.
  1. For any pier,
    1. The pier shear capacity shall be calculated as: 

    2. The pier rocking shear capacity shall be calculated as:

  2. The wall piers at any level are acceptable if they comply with one of the following modes of behavior:
    1. Rocking controlled mode. When the pier rocking shear capacity is less than the pier shear capacity, i.e., 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:

    2. Shear controlled mode. Where the pier shear capacity is less than the pier rocking capacity, i.e., Va < Vr in at least one pier 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:



      and



      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.

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:

Related Code Sections


A112.2 Seismic Strengthening Provisions for Unreinforced Masonry Bearing Wall Buildings, Existing Unreinforced Masonry Walls
Flexural components of deflection may be neglected in determining the rigidity of an unreinforced masonry wall ...
2015 IEBC portion of the 2018 CT State Building Code > A1 Seismic Strengthening Provisions for Unreinforced Masonry Bearing Wall Buildings > A112 Analysis and Design > A112.2 Existing Unreinforced Masonry Walls
Section A101 Seismic Strengthening Provisions for Unreinforced Masonry Bearing Wall Buildings, Purpose
of earthquakes on existing unreinforced masonry bearing wall buildings. The provisions of this chapter are intended as minimum standards for structural ...
2015 IEBC portion of the 2018 CT State Building Code > A1 Seismic Strengthening Provisions for Unreinforced Masonry Bearing Wall Buildings > A101 Purpose
A106.3.2.1 Seismic Strengthening Provisions for Unreinforced Masonry Bearing Wall Buildings, Multiwythe Solid Brick
, or the backing wythes shall be bonded together with separate headers with their area and spacing conforming to the foregoing. Wythes of walls not bonded ...
2015 IEBC portion of the 2018 CT State Building Code > A1 Seismic Strengthening Provisions for Unreinforced Masonry Bearing Wall Buildings > A106 Materials Requirements > A106.3 Existing Unreinforced Masonry > A106.3.2 Lay-Up of Walls > A106.3.2.1 Multiwythe Solid Brick
A106.3.2.3 Seismic Strengthening Provisions for Unreinforced Masonry Bearing Wall Buildings, Other Lay-Up Patterns
Lay-up patterns other than those specified in Sections A106.3.2.1 and A106.3.2.2 above are allowed if their performance can be justified ...
2015 IEBC portion of the 2018 CT State Building Code > A1 Seismic Strengthening Provisions for Unreinforced Masonry Bearing Wall Buildings > A106 Materials Requirements > A106.3 Existing Unreinforced Masonry > A106.3.2 Lay-Up of Walls > A106.3.2.3 Other Lay-Up Patterns
A106.3.3 Seismic Strengthening Provisions for Unreinforced Masonry Bearing Wall Buildings, Testing of Masonry
unreinforced masonry walls with ν to consistently less than 30 pounds per square inch (207 kPa) shall be entirely pointed prior to retesting. 3. The ...
2015 IEBC portion of the 2018 CT State Building Code > A1 Seismic Strengthening Provisions for Unreinforced Masonry Bearing Wall Buildings > A106 Materials Requirements > A106.3 Existing Unreinforced Masonry > A106.3.3 Testing of Masonry
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