High Strength Bolt Shear Connectors -Pushout Tests


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Title: High Strength Bolt Shear Connectors -Pushout Tests

Author(s): Lawrence N. Dallam

Publication: Journal Proceedings

Volume: 65

Issue: 9

Appears on pages(s): 767-769

Keywords: bolts;bonding strength;composite construction (concrete and steel);friction; high-strength steels;pull-out tests;reinforced concrete;research;shear connectors;static tests;steels;studs.

Date: 9/1/1968

Presents static pushout tests of concrete-steel specimens using high strength bolts as shear connectors. The bolts were embedded in normal weight concrete and pretensioned by the turn-of-nut method after the concrete had aged 28 days. The length of bolt embedded was 4 in. (10.16 cm) within a 6 in. (15.24 cm) slab. Standard steel washers were spot welded under the heads of the bolts prior to installation. Twelve specimens were tested, four each with bolt diameters of 1/2, 5/8, and 3/4 in. (1.27, 1.59, and 1.90 cm). Test results show very little slip between the slab and steel beam until friction is overcome. The bolts exhibited a greater useful capacity and ultimate strength than comparable studs.