균열 콘크리트에 설치된 내진용 M16 스테인리스 스틸 확장식 후설치 앵커 인발 실험

According to KDS 14 20 54 (2021), post-installed anchors should be verified based on the specified test protocol (2018). Pullout tests on M16 stainless steel expansion anchors were conducted. Three experimental variables were included: presence of cracks, concrete compressive strength, and effective embedment depth. Eight test series, for a total of fifty anchors, were conducted. Low-strength concrete was cracked by hitting wedges between the sleeves of the semicircle section, according to the well-known method (Eligenhausen et al. 2004; Philipp Mahrenholtz 2013). The high-strength concrete was cracked using hydraulic rams invented by authors. The performance evaluation was conducted using the effectiveness factor kc and characteristic capacity according to the specified test protocol (KCI 2018). The designed values of characteristic capacity () of uncracked concrete and cracked concrete are 9.8 and 70 % of the characteristic capacity of uncracked concrete, respectively. As a result of the uncracked concrete experiment, the characteristic capacity () of all anchors, except for one series of anchors with 64 mm effective embedment depth installed in high-strength concrete, exceeded 9.8 and was higher than the design provision of KDS 14 20 54. The series of anchors with 64 mm effective embedment depth installed in uncracked high strength concrete should be designed with the characteristic capacity determined in the test. The tested anchor has characteristic capacity superior to the nominal concrete breakout strength specified in KDS 14 20 54.