Abstract
Article shows shear tests results for anchorage using bent foundation bolts 16, 24 and 36 mm in diameter and torque-controlled undercut anchors 12, 16 and 20 mm in diameter. Load-displacement diagrams were acquired for shear loads in static and dynamic cyclic tests in uncracked and cracked concrete. Cyclic loading pattern simulated seismic loads on anchors. Shear loading tests allowed to estimate influence of cracks and cyclic loading on strength and ductility of anchorage.
Highlights
Anchorage strength and ductility research was carried out in three stages
Pullout test results from concrete blocks for anchors including deformation curves were used as basic data for analysis of influence of the following factors on deformation curve: 1. crack existence in concrete block, which has high probability of occurring during seismic action according to many researchers [5,6,7,8,9,10,11]
Pullout strength depends on embedment depth determined by concrete and steel strength, whereas shear anchorage strength is determined by steel bolt strength with possible crushing of concrete and local concrete cone failure in conditions of combined stress for anchor in cracked concrete during cyclic shear [8, 16]
Summary
On the first stage of tests [1] minimum embedment depth was determined for three diameters of bent anchor bolts in concrete blocks with strength grade B30 [2, 3]. Present research results for strength and ductility in shear tests combined with pullout tests results [1] can be used in seismic design for two types of anchorage for structure and equipment in concrete base.
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