A Study of the T-head in Anchoring Cyclically Loaded Spiral Columns

Abstract

The used of hook anchorage often cause steel congestion in member joints of the building From previous study of beam-column joints mechanical anchorages provide a promising solution for steel congestion in joints Results of an experimental program on the cyclic response of footing joints using diffident types of transverse reinforcement specifically conventional stirrups and continuous spiral are presented in order to evaluate the used of mechanical anchorages Three footing joints specimens were tested under cyclic loading with consistent gravity load equal to 440 kN(0 1Agf’c) to simulate the gravity loads and earthquake loads Key variables included different anchorage methods and transverse reinforcement configuration The presented experimental program shows that specimens exhibited side-face concrete blowout back concrete pushout or a combination of two failure modes All specimens underwent plastic hinging while no bar slip was observed which demonstrate that the design of developed length based on ACI 318-14 and ACI 352R-02 provide an appropriate estimate of anchorage strength Specimen with mechanical anchorage performed better ductility and energy dissipation A comparison of the strain at the anchorages shows that mechanical anchorages can exhibit adequate anchorage capability and satisfactory performance while behaving different tensile force transference

Date of Award	2020
Original language	English
Supervisor	Tsung-Chin Hou (Supervisor)