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WITHDRAWAL AND COMPRESSION FORCE CAPACITY OF PINNED END-TO-END ROUND MORTISE-AND-TENON WOODEN JOINTS

C. A. Eckelman, E. Haviarova

Abstract


Tests were conducted to determine the withdrawal and compression force capacity of endto-end round mortise-and-tenon joints constructed of nominal 88.9- by 88.9-mm Hem-Fir studs with tenons cross pinned with either one or two pins. For specimens with one tenon cross pin, withdrawal force capacities increased from 9.1 to 14.4 kN as tenon diameters increased from 31.8 to 50.8 mm. Comparable values for joints constructed with two (smaller) cross pins ranged from 15 to 21.9 kN. Capacities of comparable joints with a single 12.7-mm tenon cross pin loaded in compression decreased from 220 to 165.7 kN as tenon diameters increased from 31.8 to 50.8 mm. In the case of compression specimens, cross mortises cut through the follower member of the joint substantially decreased compression force capacity from 172.8 to 113.2 kN as tenon and cross-mortise diameters increased from 31.8 to 50.8 mm. Compression force capacities for comparable specimens with 19.1-mm cross mortises in the follower members ranged from 157.5 to 122.3 kN for tenon diameters ranging from 31.8 to 50.8 mm.

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