Session 4.1 - Structures Precast Frames  

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Seismic Performance of RC Perimeter Frames with Slabs Containing Prestressed Units

D.B.N. Lau, R.C. Fenwick and B.J. Davidson

Three structural sub-assemblies were constructed and tested to investigate the influence of precast prestressed components in the floors on the seismic performance of ductile perimeter reinforced concrete frames. The sub-assemblies represented a bent of a frame with four beams, two of which were internal spans and two cantilever spans. One of these sub-assemblies had a floor slab, which contained precast prestressed components, consisting of two spans added to one side of the frame. In this situation the prestressed components restrain elongation in plastic hinge zones in the perimeter beams, which increased their flexural strength. The addition of the slab was found to increase the lateral strength of the frame by approximately 150 percent. The stiffness of the slab allowed bending moments to be resisted by the cantilever spans. If allowance is made for this effect, the average flexural strength increase of each plastic hinge, due to the addition of the floor, was 78 percent. This has major implications for capacity design of perimeter frames.

A computer model of a plastic hinge has been developed, which enables the influence of axial compression on the hinge elongation to be modelled. This is an initial step in investigating the influence of elongation in frames and their interaction with floor slabs containing prestressed components.

Paper 109: [Read] [Print]


Preliminary Experimental Results and Seismic Performance Implications of Precast Floor Systems with Detailing and Load Path Deficiencies

J. Matthews, D.K. Bull and J.B. Mander

Concern has been raised about the expected performance of many of New Zealand’s recently and presently constructed precast concrete buildings during a severe earthquake. The intent of this paper is to give some insight into the results from a recently completed experimental programme undertaken at the University of Canterbury. One particular concern is the detailing used to attach the precast hollowcore floor units to the perimeter frame. Results show that if a large earthquake were to hit New Zealand, precast buildings would not perform well compared to cast-insitu systems—collapse of floors may be expected.

Paper 077: [Read] [Print]

Keywords: hollowcore, elongation, diaphragm, seismic, experimental results


Seismic Structural Damage Assessment of Reinforced Concrete Framed Structures

P. Dong, P.J. Moss and A.J. Carr

To find a rational procedure for carrying out damage assessment analyses of reinforced concrete ductile framed structures under elastic code level earthquakes specified in New Zealand codes [NZS4203 1992], three main aspects of earthquake scaling were studied, namely the relationship between the member curvature ductility and structural displacement ductility, the effect of varying the hysteresis model and member damage indices on the damage indices for the storeys and structures respectively. These three aspects were studied by carrying out elastic and inelastic time-history analyses employing three fully ductile structures (design structural ductility of 5.0 assumed), four earthquakes, seven hysteresis rules and four member damage indices [Dong (2003)]. Finally, a procedure for the seismic structural damage assessment is recommended.

Paper 075: [Read] [Print]

Keywords:


Background to the Testing of a Precast Concrete Hollowcore Floor Slab Building

J.G. Matthews, D.K. Bull and J.B. Mander

Concern has been raised about the expected performance of some of New Zealand’s precast concrete buildings during a severe earthquake. The intent of this paper is to give some insight into seismic performance issues. A principal concern is the affect that beam elongation has on seat width requirements for precast floor slabs. An experimental programme undertaken at the University of Canterbury is described.

Paper 170: [Read] [Print]

Keywords: hollowcore, elongation, diaphragm, seismic, experimental results


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