508C.5 Unreinforced Masonry Materials Other Than Solid Brick.

508C.5 Unreinforced Masonry Materials Other Than Solid Brick. The provisions of this chapter are primarily intended for brick construction but are also applicable to other unreinforced masonry materials when the following conditions are satisfied:

1. The building does not exceed two stories in height.

2. In the case of hollow concrete and clay block, the shear stress is limited to that permitted by Equations 5C-1 and 5C-2 based on the net area in contact through the bed joints but not more than that calculated using a mortar shear strength, vt, of 100 psi (689.476 kPa).

3. In the case of plain concrete, the compressive strength (f´c) shall be not less than 900 psi (6,205.28 kPa) and the allowable shear strength is limited to not more than 0.02f´c.

4. In the case of all other unreinforced masonry materials, the shear stress is limited to 3 psi (20.684 kPa) based on the net area in contact through the bed joint.

Unreinforced masonry not meeting the above criteria shall have its structural function replaced and shall be resupported, if required, in accordance with Section 513C.8.