101 George creates a new age office environment that responds to the social, technical and commercial demands of business today. Tenants will benefit from the latest in electrical, communications and data supply capabilities and the building will create a workplace environment that will be fresh and stimulating for tenants, capturing natural light and maximising the spectacular outlook over Parramatta.

Archaeological investigation and documentation is being undertaken on the site bounded by George and Charles Streets in Parramatta. A large team of archaeologists started work at this site on Tuesday 14 June 2005. Through comprehensive archaeological and heritage assessments, the 101 George Street site was identified as having the potential to contain extensive and varied archaeological deposits, features and relics.

This paper has provided a broad overview of different historic developments for concrete high-rise buildings. The evolution of concrete skyscrapers from the first reinforced concrete high-rise, the Ingalls Building, which was 15 stories high to modern skyscrapers Petronas and the Jin Mao is discussed. How new innovations in construction technology such as the advances in formwork, mixing of concrete, techniques for pumping, and types of admixtures to improve quality have all contributed to the ease of working with concrete in high-rise construction is also briefly discussed in the paper.

Available for sale through Standards Australia, or for loan through CCAA library.

Guide to Long-Span Concrete Floors has been produced to provide architects, building designers, structural engineers and architectural and engineering students and lecturers with an appreciation of the factors that should be taken into consideration in selecting a flooring system for a particular building. Covering major architectural, structural design and construction considerations this publication incorporates sketches and photographs and included graphs to enable designers to quickly identify appropriate floor systems to carry applied loading for the desired span and provide approximate dimensions for the preliminary design.

Vibration is a serviceability limit state for the design of suspended floor systems in buildings that is not well understood by many structural engineers. Dynamic behaviour is an important design consideration for slender, two-way floors, particularly for those of post-tensioned concrete construction. At present, there are no reliable design guidelines that deal with this problem. This paper describes a research program on the dynamic behaviour of posttensioned concrete floors that is presently underway at Queensland University of Technology in Brisbane, Australia.

Austress Freyssinet is a design and contracting company specialising in structural, remedial and geotechnical works. Post-tensioned floor systems in building structures such as car parks, offices, residential buildings and shopping centres have always been a key aspect of the Company's activities. Post tensioning work is a core activity for the company, used in applications including buildings, bridges, silos, industrial facilities, nuclear power plants, dams, harbours, tunnels, etc. Their website has a vast range of technical and project information on post tensioned construction.

Fabquick are a supplier of self climbing jump form systems and self climbing perimeter screen systems, their website has a range of technical and project information on these systems.

Peri Australia are a supplier of self climbing jump form systems and self climbing perimeter screen systems, their website has a range of technical and project information on these systems.

POST-TENSIONED slab design is widely used in Australia, with the main benefits over conventionally reinforced concrete being its ability to span greater distances without resorting to thick slabs and beams (and the consequent loss of head height), and reduce deflection and cracking. There are also some associated labour and time savings.

Advances in corrosion protection and design flexibility give contractors new options. (About the authors: Scott Greenhaus is President of VSL and John Crigler is Vice president and Technical Manager of VSL).

FIVE red tower cranes in the heart of Surfers Paradise mark the Sunland Group's latest Gold Coast development, Circle on Cavill which combines twin residential glass towers with low rise streetfront and mall shopping in a resort style complex. The choice of the type and placement of the cranes was governed by the need for full site coverage and the ability to service the jump form construction of the high rise towers continuous with the excavation and construction of basements.