Section 2108 Strength Design of Masonry
The design of masonry structures using strength design shall comply with Section 2106 and the requirements of Chapters 1 through 7 and Chapter 9 of TMS 402/ACI 530/ASCE 5, except as modified by Sections 2108.2 through 2108.4.
Exceptions:
- AAC masonry shall comply with the requirements of Chapters 1 through 7 and Chapter 11 of TMS 402/ACI 530/ASCE 5.
- Where plan review and inspections are performed by a local building department in accordance with Sections 107 and 110, the provisions of TMS 402/ ACI 530/ASCE 5, Chapter 3, Section 3.1 and TMS 602/ ACI 530.1/ASCE 6 Sections 1.5 and 1.6 shall not apply unless specified by the architect or engineer.
Modify the second paragraph of Section 9.3.3.3 as follows:
The required development length of reinforcement shall be determined by Equation (9-16), but shall not be less than 12 inches (305 mm) and need not be greater than 72 db.
Modify items (c) and (d) of Section 9.3.3.4 as follows:
9.3.3.4 (c) — A welded splice shall have the bars butted and welded to develop at least 125 percent of the yield strength, ƒ y, of the bar in tension or compression, as required. Welded splices shall be of ASTM A706 steel reinforcement. Welded splices shall not be permitted in plastic hinge zones of intermediate or special reinforced walls.
9.3.3.4 (d) — Mechanical splices shall be classified as Type 1 or 2 in accordance with Section 18.2.7.1 of ACI 318. Type 1 mechanical splices shall not be used within a plastic hinge zone or within a beam-column joint of intermediate or special reinforced masonry shear walls. Type 2 mechanical splices are permitted in any location within a member.
Modify Section 6.1.5.1 as follows:
6.1.5.1 The required development length of reinforcing bars shall be determined by Equation (6-1), but shall not be less than 40 db and need not be greater than 72 db.
Equation 6-1 from TMS 402/ACI 530/ASCE 5, unchanged. Gamma factors are changed as follows:
| γ | = | 1.0 for No. 3 (M#10) through No. 5 (M#16) bars; |
| γ | = | 1.04 for No. 6 (M#19) through No. 7 (M#22) bars; and |
| γ | = | 1.2 for No. 8 (M#25) through No. 11 (M#36) bars |