Masonry Shear Walls.

(3) Masonry construction prescribed by this

failure to collapse. All connectors for load-bearing

document shall be in accordance with the following

and

non-load-bearing

walls

will

therefore

be

provisions:

designed in accordance with ACI 318, as modified by

Section 9.1.1 of FEMA 302. The shear force will be

(a) Seismic Design Categories A, B, and C.

uniformly distributed throughout the height or length

Masonry shear walls shall comply with the

of the shear wall with reasonably spaced connectors

requirements of intermediate reinforced masonry

(maximum spacing 4 feet), rather than with a few that

shear walls (Section 11.11.4 of FEMA 302) or

will have localized concentration of stresses.

special reinforced masonry shear walls (Section

Detailed calculations will be made, including the

11.11.5 of FEMA 302).

localized effects in concrete walls attributed from

these connectors. Sufficient details of connectors and

(b) Seismic Design Categories D, E, and F.

embedded anchorage will be provided to preclude

Masonry shear walls shall comply with the

construction deficiency.

requirements of special reinforced masonry shear

walls (Section 11.11.5 of FEMA 302).

(4) Typical details. Refer to Figure 7-9 for

details.

(c) Basic requirements. Unit masonry will

be reinforced with deformed bars for axial, flexural,

(5) Acceptance criteria. FEMA 302 requires

shear, and diagonal tension stresses as determined by

that connections for precast concrete walls shall be

design calculations. Additional reinforcing bars are

designed to be stronger than the adjacent precast

prescribed for use around openings, at corners, at

panels.

The lateral-load response behavior is

anchored intersections, and at the ends of wall panels

therefore comparable to that for monolithic shear

(for example, at control joints).

The minimum

walls, and the acceptance criteria of Paragraph 7-

reinforcement prescribed in FEMA 302 is intended to

2f(3) will be applicable.

provide empirical requirements relative to damage

h.

Masonry Shear Walls.

control (ductility and boundary conditions). Layout

and details of construction will be compatible with

the application of the rules for modular measure.

(1)

General design criteria.

This section

prescribes the criteria for the structural design of

(d)

Types of reinforced masonry walls.

shear walls of unit masonry construction. The basic

Masonry will conform to one of the following basic

reference documents are FEMA 302 and ACI 530.

types: reinforced grouted masonry, reinforced hollow

masonry, or reinforced filled-cell masonry.

(2)

Unreinforced or plain masonry bearing

walls or shear walls, where permitted, shall be used

only for buildings in Seismic Design Category A or

B. Design shall be in accordance with Section 11.3.3

of FEMA 302.

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