Behaviour under seismic loading of reinforced concrete beam-column joints with anchorage blocks. (1972)
Type of ContentTheses / Dissertations
Thesis DisciplineCivil Engineering
Degree NameMaster of Engineering
PublisherUniversity of Canterbury
This report deals with the behaviour of beam-column joints of reinforced concrete frames with anchorage blocks. The beam entered one face of the column only and the beam flexural reinforcement was anchored in an anchorage block (beam stub) beyond the joint. The frames were subjected to high intensity cyclic loading to simulate earthquake loads.
An experimental program consisting of three full scale tests was conducted to investigate the behaviour of the joints in a lower storey of a multi-storey frame. The beam was designed to have a theoretical ultimate moment of resistance that was about twenty per cent greater than the combined moment of resistance of the columns. This was so the basic ductility requirements for columns could also be studied. The main design parameter was the amount and arrangement of transverse steel reinforcement within the joint. All three units were subjected to the same program of static cyclic loading and the experimental moment-rotation characteristics were compared.
Results from the tests were very encouraging arid it should be possible with the information obtained, to postulate a detail which. will successfully take the shear forces imposed on the joint during cyclic loading.
Four main factors arise from the tests and these should be considered in detailing reinforced beam-column joints; i) Shear crack patterns occur only in the actual joint region and on a diagonal, not a 45 degree, basis. ii) The radiused part of the main beam flexural bars should be situated outside the line of the exterior column reinforcing bars. iii) The provision of ties around the column bars in the joint region is much more effective than providing ties which also take in the anchorage block region. iv) The unsupported length which a column tie spans between two 90 degree bends should be restricted. If the length is too long then special transverse ties should be positioned through the joint.
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Renton, G. W. (University of Canterbury. Civil Engineering, 1972)This project investigates the behaviour of reinforced concrete beam-column joints under the application of high intensity cyclic loading. The experiments, which were carried out on specimens with a beam framing in on only ...
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