Section A104

SYMBOLS AND NOTATIONS

[BS] A104.1 Symbols and notations. For the purpose of this chapter, the following notations supplement the applicable symbols and notations in the building code. an = Diameter of core multiplied by its length or the

area of the side of a square prism.

144 2019 CALIFORNIA EXISTING BUILDING CODE

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100735044

A = Cross-sectional area of unreinforced masonry pier

or wall, square inches (10 ^-6 m ² ).

Ab = Total area of the bed joints above and below the

test specimen for each in-place shear test, square inches (10 ^-6 m ² ).

An = Area of net mortared or grouted section of a wall or

wall pier. D = In-plane width dimension of pier, inches (10 ^-3 m),

or depth of diaphragm, feet (m).

DCR = Demand-capacity ratio specified in Section A111.4.2.

f'm = Lower bound masonry compressive strength. fsp = Tensile-splitting strength of masonry. Fwx = Force applied to a wall at level x, pounds (N). H = Least clear height of opening on either side of a

pier, inches (10 ^-3 m).

h/t = Height-to-thickness ratio of URM wall. Height, h,

is measured between wall anchorage levels and/or slab-on-grade.

L = Span of diaphragm between shear walls, or span

between shear wall and open front, feet (m).

Lc = Length of crosswall, feet (m). Li = Effective diaphragm span for an open-front

building specified in Section A111.8, feet (m).

P = Applied force as determined by standard test

method of ASTM C496 or ASTM E519, pounds (N).

PD = Superimposed dead load at the location under

consideration, pounds (N). For determination of the rocking shear capacity, dead load at the top of the pier under consideration shall be used.

PD+L = Stress resulting from the dead plus actual live load

in place at the time of testing, pounds per square inch (kPa).

Ptest = Splitting tensile test load determined by standard

test method ASTM C496, pounds (N).

Pw = Weight of wall, pounds (N). R = Response modification factor for Ordinary plain

masonry shear walls in Bearing Wall System from Table 12.2-1 of ASCE 7, where R = 1.5.

SDS = Design spectral acceleration at short period, in g

units.

SD1 = Design spectral acceleration at 1-second period, in

g units. va = The shear strength of any URM pier, m A/1.5

pounds (N).

vc = Unit shear strength for a crosswall sheathed with

any of the materials given in Table A108.1(1) or A108.1(2), pounds per foot (N/m).

vmL = Shear strength of unreinforced masonry, pounds

per square inch (kPa).

APPENDIX A

Vaa = The shear strength of any URM pier or wall,

pounds (N). Vca = Total shear capacity of crosswalls in the direction

of analysis immediately above the diaphragm level being investigated, vcLc, pounds (N). Vcb = Total shear capacity of crosswalls in the direction

of analysis immediately below the diaphragm level being investigated, vcLc, pounds (N). Vp = Shear force assigned to a pier on the basis of its

relative shear rigidity, pounds (N). Vr = Pier rocking shear capacity of any URM wall or

wall pier, pounds (N). vtest = Load at incipient cracking for each in-place shear

test performed in accordance with Section A106.3.3.1, pounds (N). vtl = Lower bound mortar shear strength, pounds per

square inch (kPa). vto = Mortar shear test values as specified in Section

A106.3.3.5, pounds per square inch (kPa). vu = Unit shear capacity value for a diaphragm sheathed

with any of the materials given in Table A108.1(1) or A108.1(2), pounds per foot (N/m). Vwx = Total shear force resisted by a shear wall at the

level under consideration, pounds (N).

W = Total seismic dead load as defined in the building

code, pounds (N). Wd = Total dead load tributary to a diaphragm level,

pounds (N). Ww = Total dead load of a URM wall above the level

under consideration or above an open-front building, pounds (N). Wwx = Dead load of a URM wall assigned to level x

halfway above and below the level under consideration, pounds (N).

vuD = Sum of diaphragm shear capacities of both ends of

the diaphragm, pounds (N).

vuD For diaphragms coupled with crosswalls, uD

includes the sum of shear capacities of both ends of diaphragms coupled at and above the level under consideration, pounds (N).

Wd = Total dead load of all the diaphragms at and above

the level under consideration, pounds (N).