Masonry Magazine August 1987 Page. 23
CRCENT ULT. TENSILE LOAD
D MINIMA
A) "L" BOLT
D) PLATE ANCHOR
50
100
150
TEMPERATURE T
200
250
D MINAN
B) "J" BOLT
D. MIN.
Effect of Temperature on Ultimate Tensile Capacity
FIG. 11
joints) may cause reductions in anchor capacities. This is especially true with the self-contained adhesive anchors since a limited volume of epoxy is available to fill the voids and provide a bond to the anchor. 5) The adhesive bond strength is reduced at elevated temperatures and may also be adversely affected by some chemicals (see Table 2 and Fig. 11).
INSTALLATION DETAILS
Conventional Anchor Bolts
Typical embedment details for each type of conventional anchor used in grouted collar joint construction are shown in Fig. 12. The conventional embedded anchors (headed bolts, bent bar and plate anchors) are usually placed at the intersection of a head joint and bed joint. By using this location, the brick units adjacent to the anchor can be chipped or cut to accept the anchor without altering the joint thickness.
D MIN.
A) "L" BOLT
E) THROUGH BOLT
D MIN.
C) HEADED BOLT
Conventional Anchors in Multi-Wythe Brick Masonry
FIG. 13
Typical embedment details of conventional anchors in multi-wythe brick construction are shown in Fig. 13. A brick, or portion of a brick, is left out of the inner wythe to form a cell for the embedded anchor (Fig. 14). After the anchor is placed, the cell is filled with mortar or grout prior to placement of the next course.
In hollow brick construction, the units are laid so that the cells are aligned and provide continuous channels for reinforcing steel placement and for grouting. Depending on the design, every cell or intermittent cells may be reinforced and grouted (see Technical Notes 41 Revised). The anchor embedment detail will depend on the reinforcing pattern used in the construction. Figure 15 shows typical embedment details for conventional anchors embedded between reinforcing cells. The anchor should be solidly surrounded vertically and horizontally by grout for a minimum distance of twice the embedment depth (15) (Figs. 14 and 15) for full tension cone development. The tension cone theory is discussed in following sections. This may require that some cells be partially grouted. A wire mesh
D) THROUGH BOLT
D MIN.
B) "J BOLT
D MIN.
E) PLATE ANCHOR
D MIN.
C) HEADED BOLT
A) FULL BRICK OMITTED
B) BRICK CLIPPED
Conventional Anchors in Grouted Collar Joints
Plan View of Grout Cell in Multi-Wythe Brick Masonry
FIG. 12
5
FIG. 14