EXPERIMENTAL STUDY ON ANCHORAGE METHOD OF FOOTING FOR POWER TRANSMISSION TOWER USING EMBEDDED STEEL ANCHOR

The design method of pull-out shear capacity of footing supported by four piles is shown in Standard Specification for Concrete of JSCE. However, since the specimen used for verification is generally limited to small models, the size effect on pull-out shear has not been evaluated quantitatively enough. Furthermore, the contribution of shear reinforcing bars (stirrups) to shear capacity is not also clarified enough. Therefore, in this study, pull-out tests using full scale specimens are newly carried out in addition to our previous experiments. Through these test results, we evaluate the design method of pull-out shear capacity taking account of size effect and contribution of stirrups. In addition, based on the behavior of embedded steel member as anchorage obtained from detailed measurements, we try to rationalize the design method of the steel anchor.