Precast Buildings in New Zealand

In: Other Topics

Submitted By siddharth
Words 507
Pages 3
PAPER 1(Summary)
A perspective on seismic design of Precast concrete structures in
New Zealand – Robert Park(PCI journal : 1995)
MOMENT RESISTING FRAMES WITH PRECAST REINFORCED ELEMENTS
The approach is to design and construct connections that possess stiffness, strength & ductility similar to that of cast-in-place concrete monolithic constructions
The three different types of beam column connection arrangement are discussed below: 1. System 1 * The precast beam elements are placed on the cover concrete of cast-in-place columns * The reinforcement is then placed on beam top, the beam-to-column joint core & next storey height column * Lastly, cast-in-place concrete is placed * A mechanical key may be provided at beam end to take care of the vertical shear.

Advantage * Large reduction in quantity of site formwork
Limitations
* Column dimension need to be reasonably large to accommodate the required development length of bottom reinforcement of the precast beams in joint core. * The critical section of the potential plastic hinge region in beam occurs at the column face where there is a vertical joint between the cast-in-place concrete of the joint core & end of the precast beam. 2. System 2
The precast portion of the reinforced concrete beams extend from near mid-span to mid-span and include within the precast element over the columns the complex arrangement of joint core hoop reinforcement which is fabricated at the pre-casting site itself.
The longitudinal reinforcement of the columns are passed through the preformed vertical holes at the joint core of the precast beams after which they are grouted.
The protruding bars of the beams are connected in a joint to be cast-in-place at the mid-span.
Advantage
* The potential plastic hinge region in beams occur within the precast elements away from the…...

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