Anchor Bolt Spacing

If this information is not available anchor bolt spacing should not exceed 6 feet on center oc.

Anchor bolt spacing. Using the international building code ibc as a point of reference the maximum spacing for a building of two stories or less is 6 feet 1829 mm on center between anchor bolts. 51 mm whichever is greater see figure 2. The spacing and location of the bolts are shown on the drawings. A rule of thumb is that an anchor should have a minimum of 12x the diameter of anchor spacing to an adjacent anchor or to any concrete edge.

The minimum effective embedment length for anchor bolts is four bolt diameters 4 db or 2 in. The embedment length of headed bolts lb is measured parallel to the bolt axis from the surface of the masonry to the bolt head bearing surface. Horizontal shear ca pacity for a specific spacing of anchor bolts is based on bearing of the anchor bolt against concrete or grout. In many cases increasing the bolt s diameter allows you to increase the minimum spacing requirement.

The length of the anchor bolt is found in the specifications. Also the concrete should have a minimum thickness of 1 5x the depth of embedment. The minimum embedded depth is 7 inches 178 mm and the minimum diameter required is 1 2 12 7 mm. Less than 10 anchor minimum spacing.

However embedding an anchor too close to the opposite face of the concrete can lead to spalling damage. Bolt spacing bolt spacing requirements range from every 4 feet to every 8 feet depending on your project s design and circumstances. This overlapping will decrease the holding values of both anchors as pictured below. 10 anchor diameter minimum spacing.

Placing anchors closer than 10 anchor diameters apart will allow the two anchors holding values to overlap.