To meet the dual challenges of climate change and peak oil, high-performance (lowenergy) buildings must be the rule rather than the exception. Typical buildings today frequently do not deliver the energy performance predicted by designers or desired by the owner. One of the primary reasons for this failure to perform is that building control systems are not designed, installed and/or operated a...

The subje t of this paper is to present a theory for the dynami radiation for e produ ed by dual-frequen y ultrasound beams in lossless and non-dispersive uids. A formula for the dynami radiation for e exerted on a three-dimensional obje t by a dual-frequen y beam is obtained stemming from the uid dynami s equations. Dependen e of the dynami radiation for e to nonlinear e e ts of the medium is ...

A quantitative and automated phase analysis of dual-phase (DP) steel using electron backscatter diffraction (EBSD) was attempted. A ferrite-martensite DP microstructure was produced by intercritical annealing and quenching. An EBSD map of the microstructure was obtained and post-processed for phase discrimination. Band slope (BS), which was a measure of pattern quality, exhibited much stronger ...

A myriad of cables transport power and communication signals in larger buildings and installations. Cross talk between cables and connected equipment is a major concern. Regulations do exist, but often show to be insufficient to avoid undesirable coupling. The present thesis research addresses this problem and provides a tested model for the interference coupling in buildings, in particular tho...

In this study, the progressive collapse potential of seismically designed steel plate shear wall (SPSW) systems is investigated using the alternate path method, and their performances are compared with those of the conventional special moment frame (SMF) systems. Nonlinear static and dynamic analyses are conducted to follow the progressive collapse of the structures, and their ability of absorb...

Around New Zealand there has been an increasing trend of ‘hybrid’ multi-storey buildings that combine reinforced concrete walls with structural steel framing systems. This study aims to characterise and understand this type building, focusing on constructed in Auckland Christchurch from 2014 onwards. Drawings a total 50 were reviewed, their features documented, including building use, height, l...

The authors are collaborating with a manufacturer of custom built steel frame modular units which are then transported for rapid erection onsite (volumetric building system). As part of its strategy to develop modular housing, Enemetric, is taking the opportunity to develop intelligent buildings, integrating a wide range of sensors and control systems for optimising energy efficiency and direct...

Using state-of-the-art computational tools in seismology and structural engineering, validated using data from the Mw=6.7 January 1994 Northridge earthquake, we determine the damage to two 18-story steel moment-frame buildings, one existing and one new, located in southern California due to ground motions from two hypothetical magnitude 7.9 earthquakes on the San Andreas Fault. The new building...

The use of fly ash is not only in harmony with the concept of sustainable development, but also beneficial to some mechanical properties of concrete. This paper discusses steel corrosion rate time-changing law in concrete with different replacing ratios of low calcium fly ash(10%~30%) and the microcosmic characteristic of concrete-steel interface. The steel corrosion rate was tested by linear p...