The Experts below are selected from a list of 34833 Experts worldwide ranked by ideXlab platform

Seo Jung Hack - One of the best experts on this subject based on the ideXlab platform.

Mitchell Mulvey - One of the best experts on this subject based on the ideXlab platform.

  • Concrete Slab comparison and embodied energy optimisation for alternate design and construction techniques
    Construction and Building Materials, 2015
    Co-Authors: Dane Miller, Mitchell Mulvey
    Abstract:

    Abstract Construction material consumption is greater than any time in history. Australia produces approximately 30 million tonnes of finished building products each year, with over 56% of this quantity, by mass, being attributed to Concrete and a further 6%, steel. Globally, 23 trillion kilograms of Concrete alone is consumed annually, with growing population driving increasing demands. This study assesses the environmental performance of various Concrete Slab systems. Historically, the focus of environmental performance in buildings has been Operation Energy (OE) requirements, however Zero Energy Buildings (ZEB) are changing this. Specifically the study investigates the environmental performance of Concrete structures varying design parameters and construction techniques to optimise its embodied energy (EE). These structures are designed in accordance with all relevant Australian codes and standards. The various Slab systems investigated include: beam & Slab, flat Slab and flat plates while concurrently considering the use of conventionally reinforced and post-tensioned construction methods. Designs were compared in terms of EE outcomes given fixed design criteria, with results indicating reductions between 23.7% and 49.1% when utilising post-tensioned construction methods.

Faouzi Ghrib - One of the best experts on this subject based on the ideXlab platform.

  • new shear connector for open web steel joist with metal deck and Concrete Slab floor system
    Construction and Building Materials, 2016
    Co-Authors: Gregory Merryfield, Amr Elragaby, Faouzi Ghrib
    Abstract:

    Abstract The composite floor system, consists of a Concrete Slab poured on steel sheets, supported over Open Web Steel Joists (OWSJ); is widely used in commercial and industrial buildings. To achieve the desirable strength, shear connector (studs) have to be welded on the OWSJ to ensure composite action of the three components. Extending the application of this composite floor system to residential buildings, alternative shear connectors such as puddle-welds and Hilti-screws would greatly reduce the expense and accelerate the construction. Yet the current design codes consider these alternates structurally inadequate due to lack of research. The objective of this research is to investigate the ability of puddle-welds and Hilti-screws to develop composite action for building applications. The experimental program consists of testing two full scale composite decks, each consisted of two OWSJs supporting a 2.4 m wide Concrete Slab over 6.7 m span. Puddle welds and Hilti screws were used as main and only shear connector. Both test prototypes were tested until failure under different combinations of static and fatigue load cycles. Test results showed that significant composite action is developed using puddle-weld shear connectors and their behaviour meets the serviceability and ultimate strength requirements for residential applications.

David N Ilow - One of the best experts on this subject based on the ideXlab platform.

  • Concrete Slab track state of the practice
    Transportation Research Record, 2001
    Co-Authors: Shiraz D Tayabji, David N Ilow
    Abstract:

    Railway track technology has evolved over a period of 150 years since the first railroad track on timber ties was introduced. For much of this period, the conventional track system, commonly referred to as the ballasted track system, has consisted of certain components including rails, ties, ballast, and the subgrade (roadbed). Over the last 20 years, there has been an increase in the use of Concrete Slab technology for transit, commuter, and high-speed train applications. Essentially, a Slab track consists of a Concrete Slab placed on a subbase over a prepared subgrade. The rails may be directly fastened to the Concrete Slab, or the rails may be placed on Concrete blocks or another Slab system that is placed on (or embedded in) the underlying Concrete Slab. A version of the Slab track, developed in the Netherlands, incorporates rails embedded in a trough in the Slab and surrounded by elastomeric material. The Slab track systems for passenger service applications incorporate several requirements to mitigate noise and vibration. The Slab track system for transit applications in the United States and for high-speed rail in Europe and Japan has performed well over the last 20 years. Also, the limited application of the Slab track system for mixed passenger service-freight operations has also exhibited good performance. Because of the continued increase in gross tonnage expected to be carried by railroads and the expected growth in high-speed passenger rail corridors, with the smaller deviation in the rail geometry allowed for high-speed rail, the need for a stronger track structure is apparent. At-grade Concrete Slab track technology is expected to fill the need for stronger track in the United States. The state of the practice related to Concrete Slab track technology is summarized.

Khaled Soudki - One of the best experts on this subject based on the ideXlab platform.

  • effect of prestressing on the performance of gfrp reinforced Concrete Slab bridge strips
    Journal of Composites for Construction, 2013
    Co-Authors: Martin Noel, Khaled Soudki
    Abstract:

    Deterioration of reinforced Concrete structures caused by corrosion of steel reinforcement is currently a major concern affecting the safety and functionality of our infrastructure. Fiber-reinforced polymer (FRP) materials have shown tremendous potential as an alternative reinforcement for reinforced and prestressed Concrete structures. FRPs have been used in a wide variety of structural applications, from reinforced Concrete deck Slabs to posttensioned parking garages. However, one promising application for FRP reinforcing bars which has yet to be investigated thoroughly is their use in reinforced Concrete Slab bridges. This paper presents the results of an experimental study on 10 full-scale glass FRP (GFRP)-reinforced Slab bridge strips posttensioned with 0, 2, or 4 carbon FRP (CFRP) tendons with and without shear reinforcement. The tendons were either fully bonded or fully nonbonded to evaluate the effect of bond on the serviceability and ultimate performance of the Slabs, particularly in terms of their deformability. Based on the test results, the addition of prestressed CFRP tendons resulted in significantly improved serviceability and ultimate load-carrying capacity with good deformability.