ABSTRACT
Abstract This paper describes the results of a series of pull-out tests on bolts anchored in concrete blocks approximating plane stress and axisymmetric conditions. The geometrical and other parameters of the blocks conformed to the requirements of RILEM T C 90-FMA Round Robin testing programme. Tests were conducted with out confining the blocks (i.e. K = 0). The overall dimensions of the test specimens and the depth of embedment of the anchor bolt were not varied. Likewise, as far as practicable for a given specimen geometry the mix properties were not altered. Thus, the only variable was the distance between the anchor bolt and the support bearing. Keywords: Anchor Bolts, Pull-out Tests, Plane Stress Geometry, Axisymmetric Geometry, Unconfined Concrete Blocks
Test data on pull-out of anchor bolts from concrete blocks are scarce. Therefore, following an invitation from the RILEM T C 90-FMA (Fracture Mechanics of Con crete - Applications), a series of pull-out tests were conducted on bolts anchored in concrete blocks approximating plane stress and axisymmetric conditions. The geometrical and other parameters of the concrete blocks conformed very nearly to the values suggested by T C 90-FMA (1990). The tests were conducted without confining the specimens laterally (i.e. K = 0). The overall dimensions of the test specimens and the depth of embedment of the anchor bolt (d) were not varied (Figs 1,2). Likewise, as far as practicable all plane stress specimens were made from the same mix, and all axisymmetric specimens were also made from the same, albeit a weaker mix. Thus, the only variable in the series of tests was the distance between the anchor bolt and the support bearing (a in Figs 1,2). The dimensions of the available moulds were such that only three a/d ( = | , 1, 2) ratios were possible in the plane stress configuration and just two ( = | , 1) in the axisymmetric configuration.
