# Masonry Tie Bar Calculator

Tie bar count, weight, holes and resin from wall and spacing.

- Page: https://jianzhujisuan.com/en/tie-bar
- Category: Masonry (https://jianzhujisuan.com/en/c/masonry)
- Chinese version: https://jianzhujisuan.com/zh/tie-bar.md
- Data checked: 2026-10-25

## Quick result

With the default inputs (Wall height 3 m, Vertical spacing 500 mm, Bars per course 2 pcs, Length into wall 1000 mm, Bar diameter Φ6, Resin per hole 15 ml): **Total tie bars 12 bars**

## Inputs

| Parameter | Type | Default | Unit | Note |
|---|---|---|---|---|
| Wall height | number | 3 | m |  |
| Vertical spacing | number | 500 | mm | Not more than 500 mm and at least 2 per storey |
| Bars per course | number | 2 | pcs | 1 for 120 walls, 2 for 240, 3 for 370 |
| Length into wall | number | 1000 | mm | At least 1/5 of wall length and not less than 700 mm |
| Bar diameter | select | Φ6 | — |  |
| Resin per hole | number | 15 | ml |  |

## Formula

- **Courses**: n = floor(height ÷ spacing), at least 2
- **Total bars**: N = courses × bars per course
- **Total length**: L = N × length into wall
- **Weight**: W = L × 0.00617 × d²
- **Resin**: V = N × resin per hole

## Worked example

A 3 m wall at 500 mm spacing with 2 Φ6 bars per course extending 1000 mm: 6 courses, 12 bars, 12 m total, 2.66 kg, 12 holes and about 180 ml of resin.

## Questions

### Must tie bars be resin-anchored?

Depends on the structure. Columns can be cast-in or drilled-in, shear walls usually have starter bars or resin anchors, and infill-to-tie-column joints are normally cast in. Cast-in is most reliable but easily misplaced; resin anchoring is flexible but needs drilling, cleaning, injection, curing and pull-out tests. Bars missed during the frame stage are the commonest source of rework.

### Why at least two courses per storey?

With only one tie the infill can rotate about it like a door, cracking and spalling away from the beam soffit. Two or more courses restrain the panel in the frame plane. Seismic areas also require continuous bars tied into the tie columns to make the panel act as a unit.

### How is pull-out testing done?

Sample at least three bars per inspection lot, load to 1.2 times the design value, hold two minutes, and pass if there is no slip or cracking. A failure means doubling the sample; a second failure invalidates the lot, requiring extra bars or a different connection. Keep the records — they are checked at handover.

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