N.Y.C. Admin. Code § BC 2107: Section BC 2107: Allowable Stress Design

2107.1 General.

The design of masonry structures using allowable stress design shall comply with Section 2106 and the requirements of Chapters 1 through 8 of TMS 402 except as modified by Sections 2107.2 through 2107.4 of this code.

2107.2 TMS 402, Section 6.1.6.1.1, lap splices.

As an alternative to Section 6.1.6.1.1, it shall be permitted to design lap splices in accordance with Section 2107.2.1 of the New York City Building Code.

2107.2.1 Lap splices.

The minimum length of lap splices for reinforcing bars in tension or compression, l

d

, shall be

l

d

= 0.002d

b

f

s

(Equation 21-1)

For SI: l

d

= 0.29d

b

f

s

but not less than 12 inches (305 mm). In no case shall the length of the lapped splice be less than 40 bar diameters.

where:

d

b

= Diameter of reinforcement, inches (mm).

f

s

= Computed stress in reinforcement due to design loads, psi (MPa).

In regions of moment where the design tensile stresses in the reinforcement are greater than 80 percent of the allowable steel tension stress, F

s

, the lap length of splices shall be increased not less than 50 percent of the minimum required length, but need not be greater than 72d

b

. Other equivalent means of stress transfer to accomplish the same 50 percent increase shall be permitted. Where epoxy coated bars are used, lap length shall be increased by 50 percent.

2107.3 TMS 402, Section 6.1.6.1, splices of reinforcement.

Modify Section 6.1.6.1 as follows:

6.1.6.1 – Splices of reinforcement. Lap splices, welded splices or mechanical splices are permitted in accordance with the provisions of this section. All welding shall conform to AWS D1.4. Welded splices shall be of ASTM A706 steel reinforcement. Reinforcement larger than No. 9 (M #29) shall be spliced using mechanical connections in accordance with Section 6.1.6.1.3.

2107.4 TMS 402, Section 8.3.6, maximum bar size.

Add the following to Chapter 8:

8.3.6 – Maximum bar size. The bar diameter shall not exceed one-eighth of the nominal wall thickness and shall not exceed one-quarter of the least dimension of the cell, course or collar joint in which it is placed.