Masonry Anchor Bolt in Shear (TMS 402 ASD)

TMS 402-16 ASD allowable shear = LEAST of four modes: masonry breakout Bvb = 1.25 x Apv x sqrt(f'm) with Apv = pi lbe^2 / 2 (edge distance lbe), masonry crushing Bvc = 350 x (f'm Ab)^(1/4), anchor pryout Bvpry = 2.0 x Bab, and bolt steel Bvs = 0.36 x Ab x fy. A 3/4in A307 bolt in 1,500 psi masonry, 5 in embedment 4 in from an edge -> 1,217 lb (masonry breakout governs near the edge); the same bolt away from edges gives 1,776 lb (crushing governs). Breakout controls near an edge, crushing usually controls in the field, pryout only at very shallow embedment. Combined tension+shear use the unity check separately. A design aid; the engineer of record's stamped design governs.

Bv = least of: masonry breakout Bvb = 1.25 x Apv x sqrt(f'm), Apv = pi x lbe^2 / 2; masonry crushing Bvc = 350 x (f'm x Ab)^(1/4); anchor pryout Bvpry = 2.0 x Bab, Bab = 1.25 x (pi lb^2) x sqrt(f'm); bolt steel Bvs = 0.36 x Ab x fy.

TMS 402-16 (Building Code Requirements for Masonry Structures, ACI 530 / ASCE 5) allowable-stress anchor-bolt shear provisions (Section 8.1.5.2), as compiled in the Masonry Designers' Guide and CMHA TEK notes, by name.

CMHA TEK 12-03 anchor-bolt design notes are free public CMHA technical notes; the crushing coefficient 350 x (f'm Ab)^(1/4) is verified directly against NCMA TEK 12-03A, and the breakout / pryout / steel arithmetic is public.

Estimate. AHJ and licensed professional govern.

Field names used by the API: fm_psi, lb_in, lbe_in, ab_in2, fy_psi, bv_lb, bvc_lb

• Four modes, least governs Bvb (breakout), Bvc (crushing), Bvpry (pryout), Bvs (steel); Bv = minTMS 402-16 Section 8.1.5.2
• Crushing coefficient Bvc = 350 x (f'm x Ab)^(1/4), verified vs NCMA TEK 12-03A (stable across editions)NCMA TEK 12-03A / TMS 402
• Full half-cone Apv = pi x lbe^2 / 2 assumes a full breakout half-cone; edge/overlap reductions and the < 12 db reduction are separateTMS 402