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SAWHORSE
Someone was looking for page C59 of ACI 530, but I cant find the thread
BUILDING CODE REQUIREMENTS FOR MASONRY STRUCTURES
Page C-59
2.1.5.2.3 Headers of wythes bonded by headers shall meet the requirements of
Section 2.1.5.2.2 and shall be provided as follows:
(a) Headers shall be uniformly distributed and the sum of their cross-sectional areas shall be at least 4 percent of the wall surface area.
(b) Headers connecting adjacent wythes shall be embedded a minimum of 3 in. (76.2 mm) in each wythe.
2.1.5.2.4 Wythes not bonded by headers shall meet the requirements of Section
2.1.5.2.2 and shall be bonded by wall ties provided as follows:
Wire size Minimum number of wall ties required
W1.7 (MW11) one per 22/3 ft2 (0.25 m2) of wall
W2.8 (MW18) one per 41/2 ft2 (0.42 m2) of wall
The maximum spacing between ties shall be 36 in. (914 mm) horizontally and 24 in. (610 mm) vertically.
The use of rectangular wall ties to tie walls made with any type of masonry units is permitted.
The use of Z wall ties to tie walls made with other than hollow masonry units is permitted. Cross wires of joint reinforcement are permitted to be used instead of wall ties.
2.1.5.3 Noncomposite action — Masonry designed for noncomposite action shall comply with the following provisions:
2.1.5.3.1 Each wythe shall be designed to resist individually the effects of loads
imposed on it.
Unless a more detailed analysis is performed, the following requirements shall be satisfied:
(a) Collar joints shall not contain headers, grout, or mortar.
(b) Gravity loads from supported horizontal members shall be resisted by the wythe nearest to the center of span of the supported member. Any resulting bending moment about the weak axis of the wall shall be distributed to each wythe in proportion to its relative stiffness.
© Loads acting parallel to the plane of a wall shall be carried only by the wythe on which they are applied. Transfer of stresses from such loads between wythes shall be neglected.
(d) Loads acting transverse to the plane of a wall shall be resisted by all wythes in proportion to their relative flexural stiffnesses.
BUILDING CODE REQUIREMENTS FOR MASONRY STRUCTURES
Page C-59
2.1.5.2.3 Headers of wythes bonded by headers shall meet the requirements of
Section 2.1.5.2.2 and shall be provided as follows:
(a) Headers shall be uniformly distributed and the sum of their cross-sectional areas shall be at least 4 percent of the wall surface area.
(b) Headers connecting adjacent wythes shall be embedded a minimum of 3 in. (76.2 mm) in each wythe.
2.1.5.2.4 Wythes not bonded by headers shall meet the requirements of Section
2.1.5.2.2 and shall be bonded by wall ties provided as follows:
Wire size Minimum number of wall ties required
W1.7 (MW11) one per 22/3 ft2 (0.25 m2) of wall
W2.8 (MW18) one per 41/2 ft2 (0.42 m2) of wall
The maximum spacing between ties shall be 36 in. (914 mm) horizontally and 24 in. (610 mm) vertically.
The use of rectangular wall ties to tie walls made with any type of masonry units is permitted.
The use of Z wall ties to tie walls made with other than hollow masonry units is permitted. Cross wires of joint reinforcement are permitted to be used instead of wall ties.
2.1.5.3 Noncomposite action — Masonry designed for noncomposite action shall comply with the following provisions:
2.1.5.3.1 Each wythe shall be designed to resist individually the effects of loads
imposed on it.
Unless a more detailed analysis is performed, the following requirements shall be satisfied:
(a) Collar joints shall not contain headers, grout, or mortar.
(b) Gravity loads from supported horizontal members shall be resisted by the wythe nearest to the center of span of the supported member. Any resulting bending moment about the weak axis of the wall shall be distributed to each wythe in proportion to its relative stiffness.
© Loads acting parallel to the plane of a wall shall be carried only by the wythe on which they are applied. Transfer of stresses from such loads between wythes shall be neglected.
(d) Loads acting transverse to the plane of a wall shall be resisted by all wythes in proportion to their relative flexural stiffnesses.
