Design and verify cast-in anchor bolts with automated compliance checks for all failure modes defined in ACI 318-19 Chapter 17. Interactive graphics, step-by-step calculations, and one-click PDF export.
Capabilities
All critical ACI 318-19 anchor-bolt failure modes and design checks in one integrated tool.
Full range of metric headed bolt sizes with automatic property lookup for grade 4.6, 5.8, and 8.8 steel.
Verify steel tensile capacity of anchor bolts against factored tensile demand per ACI 318-19 Sec. 17.6.1.
CCD method for concrete breakout cones including edge effects, group factors, and eccentricity modifications.
Bearing-based pullout check for headed anchors per Sec. 17.6.3, including cracking factor adjustments.
Lateral blowout check for anchors near a free edge per Sec. 17.6.4, with group and edge-distance corrections.
Steel shear strength of anchor bolts with lever-arm considerations per Sec. 17.7.1.
Concrete pryout capacity for short, stiff anchors per Sec. 17.7.3 with automatic kcp factor selection.
Tri-linear and elliptical interaction checks per Sec. 17.8 for combined loading conditions.
Base-plate-to-anchor fillet weld capacity including effective throat and directional strength increase.
Concrete bearing pressure under anchor head and base plate verified against allowable limits.
Distributes combined axial, shear, and moment loads to individual bolts using elastic analysis.
Real-time SVG drawings of your anchor layout in plan and elevation that update as you change inputs.
Transparent output showing every formula, variable, and intermediate result for full traceability.
One-click export of the complete calculation package for submittal, review, or archival.
Workflow
Four straightforward steps from inputs to a print-ready calculation sheet.
Select bolt size, grade, embedment depth, edge distances, and anchor group geometry from the input panel.
Input factored axial loads, shear forces, and moments. The elastic method distributes them to each bolt automatically.
The calculator evaluates every failure mode -- tension, shear, breakout, pullout, pryout, blowout, interaction, weld, and bearing -- in real time.
Generate a professional calculation sheet with all inputs, diagrams, formulas, and pass/fail results ready for submittal.