Abstract

 
 
 
 To study the behaviour of multistorey building frames under gravity and severe earthquake conditions a reinforced concrete portal frame was constructed. The beam was subjected to constant vertical loads while a cyclic lateral load was applied to the unit. Negative moment plastic hinges formed at the column faces while the positive moment hinges were located in the span. The rotations generated by each inelastic displacement accumulated. This placed high rotational demands on the plastic hinges, which reduced the overall ductile behaviour compared with that observed in typical beam-column sub-assembly tests. The high rotations caused the beam to grow in length.
 
 
 
Highlights
In a previous paper [1] it was shown that extensive redistribution of gravity actions can occur in a frame structure when plastic hinges are formed
This paper describes the construction and testing of a reinforced concrete portal frame, which was designed to form nonreversing plastic hinge zones, under cyclic inelastic lateral loading
The portal frame was proportioned so that under the action of these loads, together with cyclic lateral loading, negative moment hinges would form in the beam close to the column faces while positive moment hinges would form near the vertical load points
Summary
To study the behaviour of multistorey building frames under gravity and severe earthquake conditions a reinforced concrete portal frame was constructed. The beam was subjected to constant vertical loads while a cyclic lateral load was applied to the unit. Negative moment plastic hinges formed at the column faces while the positive moment hinges were located in the span. The rotations generated by each inelastic displacement accumulated. This placed high rotational demands on the plastic hinges, which reduced the overall ductile behaviour compared with that observed in typical beam-column sub-assembly tests. The high rotations caused the beam to grow in length. Editors Note: This paper was first published in the Proceedings of the 1988 Pacific Concrete Conference and is reprinted with the permission of the Cement and Concrete Association of New Zealand and the New Zealand Concrete Society
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