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The company was founded by Barclay Simpson in Oakland in 1956, as a successor to his father's window screen company. [1] Simpson manufactured joist hangers and the company's subsidiary Simpson Strong-Tie Co. Inc. became a dominant producer of structural connectors in North America and Europe. [1]
Although the use of steel joist hangers to support floor joists is recommended over a ledger supporting the joists because of house settling and nail separation, they are not required by code in most municipalities. However, toe nailing & end nailing is nowhere near as effective as using hangers to support flooring systems. [7]
The rim joist depth must match the I-joist size. Mismatches can strain the joist. A similar situation occurs where the I-joist crosses a main beam. Installing squash blocks (2×4 materials 1 ⁄ 16 in or 1.6 mm higher than the I-joist) alongside the I-joists transfers the load from the I-joist onto the beam. Missed nails and glue setting too ...
A rim joist's relationship to the joists is similar to what the top or bottom wall plate is to the studs. It is also confusingly called a header (header also refers to other framing components) or rim board. Collectively, the end joists and rim joists are called band joists, especially in regard to deck construction.
A hook is a hand tool used for securing and moving loads. It consists of a round wooden handle with a strong metal hook about 20 cm (8 inches) long projecting at a right angle from the center of the handle. The appliance is held in a closed fist with the hook projecting between two fingers.
However, α=45° will be stronger than α=90° if shear strength is greater than σ/2. The joint is strongest between these two angles at 63.4°. The joint becomes stronger than 63.4° at 25.4°. At a shallow enough angle, strength of the joint continues to increase and failure will occur anywhere in the two pieces, most likely outside the joint.
Attempts have been made to increase the safety of bridges with pin and hanger assemblies by adding some form of redundancy to the assembly. Retrofits that add redundancy to pin and hanger assemblies include adding a "catcher's mitt"—a short steel beam attached to the bottom of the cantilevered girder that extends out beneath the suspended girder to "catch" the suspended girder should ...
A box tool is mounted on the turret of a turret lathe or screw machine. It is essentially a toolpost that brings its follower rest along with it. A tool bit (or several tool bits) and a compact follower rest (usually V-shaped or with two rollers [2]) are mounted opposite each other in a body which surrounds the workpiece (forms a "box" around ...