Chapter CHAPTER 21 - MASONRYAdd a section as follows:
SECTION 2106.2 Amendments to Chapter 7 of TMS 402/602-16
NOTE: Numbers that follow are section numbers of TMS 402/602-16
7.3.1 Add the following sentence to the end of the section. Masonry walls that are nonparticipating elements, including those in a building classified as Seismic Design Category B, shall be designed and reinforced in accordance with 7.4.1.1, 7.4.3.1 and 7.5
7.3.2.5.1 Add subsection:
7.3.2.5.1Vertical Reinforcement at Openings. Two adjacent cells shall be grouted solid at each side of each opening and continuous vertical reinforcement shall be located in either of these two cells. Bars in a grouted cell may be offset horizontally by one cell to mitigate interference due to steel lintels. 7.3.2.5.2 Add Subsection: 7.3.2.5.2 7.3.2.5.2 Horizontal Shear Reinforcement. Horizontal shear reinforcement shall be provided by horizontal deformed bars in grouted bond beams at a maximum vertical spacing of 48 inches on center. The vertical spacing of horizontal deformed bars in grouted bond beams may be increased to a maximum of 104 inches on center if all of the following conditions are met:
a. Welded wire reinforcement (ladder or truss configuration) shall be provided at a maximum vertical spacing of eight inches on center and placed in a bed joint not less than 3/8 inches thick. b. The longitudinal side wires of the horizontal shear reinforcement shall be a minimum of 3/16-inch diameter with #9 cross or diagonal wire. Additional joint reinforcement or reinforcing bars in grouted bond courses shall be added to meet the design requirements. c.Joint reinforcement shall be lapped to develop the full capacity of the reinforcing in the plane of the wall, at corners, and at intersecting shear walls.7.3.2.11 Revise note (a) to read as follows:
(a) Reinforcement shall be provided in accordance with sections 7.3.2.6(a) and 7.3.2.6(b).
7.5 Add section as follows:
7.5Nonparticipating Elements. Notwithstanding the requirements of section 7.4 to the contrary, non-participating elements (i.e., those isolated from in-plane force) shall be reinforced in accordance with section 7.4.3, except as follows: 1. Reinforcement shall be provided in both the horizontal and vertical directions, and spacing of vertical bars shall not exceed 72 inches or 1/3 of the horizontal span whichever is less for Seismic Design Categories B and C, and 48 inches or 1/3 of the horizontal span whichever is less for Seismic Design Category D.2. For exterior walls, and for walls enclosing exits, exit discharges, and elevator shafts, the minimum cross-sectional area of reinforcement in the direction of the span shall be 0.0007 times the gross cross-sectional area of the wall, and shall consist of reinforcing steel bars in grouted cells, grouted bond courses, or grouted collar joints. The maximum spacing of the bars shall be the lesser of 1/3 of the span or 48 inches.Amended by Mass Register Issue 1532, eff. 10/11/2024.