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affected elastic bearing analysis ASCE average based on volume calculate changes in moisture constant of wood content and changes content and ovendry content in solid-wood Cycled data for joints determined developed Effects of moisture elastic bearing constant eliminate friction evaluation Figure Forest Products Laboratory green inch initiation joint members joint slip joints affected elastic joints were assembled lateral load Lb/in load-slip curve Madison members of two-member moisture conditions moisture content conditions nail diameter nailed joints affected nails were driven necessary obtained ovendry weight pct moisture content percent moisture content pieces pounds Prebored Lead Holes presented primary Proc Procedure Specimens Three proportional limit slip Range reduction Resistance of Nailed Slope solid-wood members species Specific gravity based Specimens Three species Struc structures subjected Table testing Thomas Lee Wilkinson tional two-member joints two-member nailed joints U.S. Forest Products USDA Forest Serv values
Page 2 - The experimental arrangement for loading the joints is shown in figure 1. Joint slip was measured with a microformer which allowed for continuous recording of the load-slip curve. The joints were loaded at a constant rate of head movement of the testing machine of 0.10 inch per minute. Each joint was subjected to...
Page 2 - Moisture content —Joints in conditions 1, 3, and 5 were evaluated immediately after assembly. For the other conditions, the joints were assembled and conditioned for 2 to 3 months while the moisture content was being changed. The same members were used for all six moisture conditions.
Page 3 - E = modulus of elasticity of the nail, pounds per square inch; d = nail diameter, inches; and » k „ = elastic bearing constant, pounds per cubic inch. This expression has the following restrictions which were met by the joints in this study: (1) Two-member joints made with round nails, (2) both members have the same elastic bearing constant, and (3) the products Xa and Ab are both greater than two, where X-2 (2) ;rEd...
Page 3 - ... experimentally determined P/<5's, slope of the load-slip curves, were used in all calculations.
Page 4 - Average Lb/in. Slope of the load-slip curve Range Lb/in. Elastic bearing constant Lb/in.3 1.22 x 10* Proportional limit slip In.
Page 2 - JOINT SLIP Figure 2. — Typical load-slip data obtained for laterally loaded, nailed joints.
Page 2 - Each joint was subjected to cyclic loading by initially loading to a low level of slip and then gradually increasing the level of slip on each succeeding cycle until a fairly linear Figure 1.