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// CODE SNIPPET

2109.2 Lateral Stability

2010 Building Code of NY > 21 Masonry > 2109 Empirical Design of Masonry > 2109.2 Lateral Stability
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2109.2.1 Shear Walls

Where the structure depends upon masonry walls for lateral stability, shear walls shall be provided parallel to the direction of the lateral forces resisted.

2109.2.1.1 Cumulative Length of Shear Walls

In each direction in which shear walls are required for lateral stability, shear walls shall be positioned in two separate planes. The minimum cumulative length of shear walls provided shall be 0.4 times the long dimension of the building. Cumulative length of shear walls shall not include openings or any element with a length that is less than one-half its height.

2109.2.1.2 Maximum Diaphragm Ratio

Masonry shear walls shall be spaced so that the length-to-width ratio of each diaphragm transferring lateral forces to the shear walls does not exceed the values given in Table 2109.2.1.2.

TABLE 2109.2.1.2
DIAPHRAGM LENGTH-TO-WIDTH RATIOS
FLOOR OR ROOF DIAPHRAGM CONSTRUCTION MAXIMUM LENGTH-TO-WIDTH RATIO OF DIAPHRAGM PANEL
Cast-in-place concrete 5:1
Precast concrete 4:1
Metal deck with concrete fill 3:1
Metal deck with no fill 2:1
Wood 2:1

2109.2.2 Roofs

The roof construction shall be designed so as not to impart out-of-plane lateral thrust to the walls under roof gravity load.

2109.2.3 Surface-Bonded Walls

Dry-stacked, surface-bonded concrete masonry walls shall comply with the requirements of this code for masonry wall construction, except where otherwise noted in this section.

2109.2.3.1 Strength

Dry-stacked, surface-bonded concrete masonry walls shall be of adequate strength and proportions to support all superimposed loads without exceeding the allowable stresses listed in Table 2109.2.3.1. Allowable stresses not specified in Table 2109.2.3.1 shall comply with the requirements of ACI 530/ASCE 5/TMS 402.

TABLE 2109.2.3.1
ALLOWABLE STRESS GROSS CROSS-SECTIONAL AREA FOR DRY-STACKED, SURFACE-BONDED CONCRETE MASONRY WALLS
DESCRIPTION MAXIMUM ALLOWABLE STRESS (psi)
Compression standard block 45
Flexural tension
   Horizontal span 30
   Vertical span 18
Shear 10

For SI: 1 pound per square inch = 0.006895 MPa.

2109.2.3.2 Construction

Construction of dry- stacked, surface-bonded masonry walls, including stacking and leveling of units, mixing and application of mortar and curing and protection shall comply with ASTM C 946.

Related Code Sections


2109.2 Masonry, Lateral Stability
Where the structure depends upon masonry walls for lateral stability, shear walls shall be provided parallel to the direction of the lateral forces ...
2010 Building Code of NY > 21 Masonry > 2109 Empirical Design of Masonry > 2109.2 Lateral Stability
2109.2.3.1 Masonry, Strength
Dry-stacked, surface-bonded concrete masonry walls shall be of adequate strength and proportions to support all superimposed loads without exceeding ...
2010 Building Code of NY > 21 Masonry > 2109 Empirical Design of Masonry > 2109.2 Lateral Stability > 2109.2.3 Surface-Bonded Walls > 2109.2.3.1 Strength
2109.2.3.2 Masonry, Construction
Construction of dry- stacked, surface-bonded masonry walls, including stacking and leveling of units, mixing and application of mortar and curing ...
2010 Building Code of NY > 21 Masonry > 2109 Empirical Design of Masonry > 2109.2 Lateral Stability > 2109.2.3 Surface-Bonded Walls > 2109.2.3.2 Construction
1808.2.5 Soils and Foundations, Stability
Piers or piles shall be braced to provide lateral stability in all directions. Three or more piles connected by a rigid cap shall be considered ...
2010 Building Code of NY > 18 Soils and Foundations > 1808 Pier and Pile Foundations > 1808.2 Piers and Piles-General Requirements > 1808.2.5 Stability
1810.2.2 Soils and Foundations, Stability
Deep foundation elements shall be braced to provide lateral stability in all directions. Three or more elements connected by a rigid cap shall ...
Building Code 2015 of New York State > 18 Soils and Foundations > 1810 Deep Foundations > 1810.2 Analysis > 1810.2.2 Stability
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