Code of Massachusetts Regulations
780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS
Chapter 21 - Masonry
Section 2107 - ALLOWABLE STRESS DESIGN
Subsection 2107.3 - TMS 402/ACI 530/ASCE 5, Section 2.1.9.7.1.1, lap splices

Universal Citation: 780 CMR MA Code of Regs 2107.3

Current through Register 1531, September 27, 2024

Modify Section 2.1.9.7.1.1 as follows:

2.1.9.7.1.1 The minimum length of lap splices for reinforcing bars in tension or compression, ld, shall be

ld = 0.002db fs (Equation 21-1)

For SI: ld = 0.29db fs

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:

db = Diameter of reinforcement, inches (mm).

fs = 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, Fs, the lap length of splices shall be increased not less than 50 percent of the minimum required length. 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.

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