Wood Lag Bolt Capacity,furniture plans with,Wooden High Chair Parts,Bedroom Dresser Woodworking Plans - PDF 2016

12.12.2014 admin
Details about pressure treated wood and wood preservative treatments are at PRESERVATIVE TREATED LUMBER. At SYNTHETIC DECK BOARDS, COMPOSITE PLASTIC VINYL we discuss details about wooden deck board alternatives such as Trex®, TimberTech®, wood-plastic composites, and plastic or vinyl decking products. However I agree that if the top rail covers the top of the post, OR if the installer caps the post with a decorative cap of wood, copper, other, then that protection of the end grain at the post top will extend the life of the system.
The net cross-sectional area of the member (measured at a right angle to the direction of the load) is the gross cross-sectional area of the member minus the area of the bolt holes in the section. Use lag screws instead of nails when the possibility of tension failure exists in timber members. Space lag screws apart at a minimum of four times the diameter of the screw, measured in the direction of the tensile or compressive load.
When the joint consists of two members of equal thickness (the bolt is in single shear), use one-half the tabulated load for a piece twice the thickness of one of the members (Figure 9-4A). The direction of bolt pressure on the grain of the wood must be considered when determining the allowable pressure. In bolted connections, the allowable load that the joint supports must not exceed the allowable bolt load of one bolt multiplied by the number of bolts used. The allowable tensile joint load for any bolted joint load must not exceed the net cross-sectional area multiplied by the allowable tensile unit stress of the lumber. Data on the species and sizes of the members to be joined is required for designing a bolted joint.
Add washers to both sides of the bolted timber connections to prevent bearing failure in the timber.

In the AFCS, preengineered structures come complete with bolts and prepunched, matched holes. Conditions may arise that call for the design and fabrication of bolted steel connections (including high-strength bolts). When equipment and trained personnel are available, use welded instead of bolted connections. Bolts provide a strong, efficient, and economical method of fastening wood members together. These tabulated loads are for bolted joints in lumber which is seasoned to a moisture content nearly equal to that it will attain in service. Table 9-2 gives the allowable pressure for bolts placed parallel and perpendicular to the grain. The net area for softwoods at the critical section for parallel-to-grain loading must be at least 80 percent of the total area in bearing under all bolts in the member. Base the bolt spacing and the minimum required edge distance on the criteria described in Figures 9-2 and Figure 9-3. The design process for bolted steel connections involves determining spacing and evaluating connection strengths and possible failures. After determining the shear and bearing capacities for a single bolt, determine the strength of the connection by examining the various modes of failure. For critical connections where a high-strength fastener is required, substitute bolts for nails. The loads are for bolted joints used under continuously dry conditions, as in most covered structures.

To compute the required number of bolts, divide the total load by the allowable load per bolt. The minimum distance from the edge of a member to the center of the nearest bolt is the edge distance.
A connection may fail by simultaneous shear, bearing, or tensile failures in any combination among the various rows of bolts. Connections that require bolts also include stringer splicing and connection of the substructure members. Use bolted timber connections to splice stringers, connect substructure members, and attach deck and curb material.
Place a washer or metal plate between the wood and the bolt head and between the wood and the nut. The allowable shear capacity for a double-shear connection is twice that of a single-shear connection. If in doubt about the quality of welding equipment or the welders' level of training, use bolted connections. Work is easier if the component parts are clamped together or secured by several fitting-up bolts before welding. Use the loads given in Table 9-2 when each of the side members of wood is half the thickness of the main (enclosed) member (Figure 9-3A).

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