Mark Lawson R.,University of Surrey |
Proceedings of the Institution of Civil Engineers: Structures and Buildings | Year: 2010
Modular construction is widely used for residential buildings of four to eight storeys and there is pressure to extend this relatively new form of construction to 12 storeys or more. This paper reviews recent modular technologies, and also presents load tests and the analysis of light steel modular walls In compression. A design method for high-rise modular applications is presented taking account of second-order effects and installation tolerances. For the modular walls tested, it was found that the plasterboard and external sheathing boards effectively prevent minor axis buckling of the C sections, so that failure occurred either by major axis buckling or local crushing of the section. In all cases, the results of the tests on 75 mm and 100 mm deep × I · 6 mm thick C sections exceeded the design resistance to BS 5950-5 by 10 to 40%. However, an eccentricity of 20 mm in load application reduced the failure load by 18 to 36% owing to local crushing of the C section. Tension tests on typical connections between the modules and corridors gave a failure load of 40 kN, which is adequate to transfer wind forces to a braced core and also to provide tying action in the event of loss of support to one corner of a module. Corner posts provide enhanced compression resistance but their buckling resistance is dependent on the sway stiffness of the wall panel. It is also shown that the notional horizontal force approach for steel structures presented in BS 5950-1 should be increased for modular construction.
Uttam K.,KTH Royal Institute of Technology |
Faith-Ell C.,WSP |
Balfors B.,KTH Royal Institute of Technology
Environmental Impact Assessment Review | Year: 2012
EIA plays an important role in enhancing the environmental performance of the construction sector. In recent years, the construction sector has been developing green procurement practices. Green procurement is a process that involves the incorporation of environmental requirements during the procurement of services and products. However, discussion on green procurement is rarely seen during the EIA phase. This paper addresses possible opportunities for improving the coordination between EIA and green procurement within the construction sector. The linking of EIA and green procurement has been postulated in the paper as an aid to strengthen the coordination between project planning and implementation. The paper is based on a literature review and is an outcome of an on-going research project concerning EIA and green procurement. This study indicated that it would be appropriate to introduce green procurement during the pre-decision phase of an EIA. In the present study, the opportunities for integrating green procurement at the stage of EIA are associated with the integration of project planning and EIA. Future research should investigate the mechanism through which the link can be established. © 2011 Elsevier Inc.
News Article | December 20, 2016
VANCOUVER, BRITISH COLUMBIA--(Marketwired - Dec. 20, 2016) - PNG Gold Corporation (the "Company") (TSX VENTURE:PGK) provides the following additional information pursuant to its previous press release dated November 10, 2016. Contracts for engineering pre-FEED studies have been entered into with Stantec Engineering ("Stantec") and WSP Canada Inc. ("WSP") to validate the previously modelled second stage design capability of the ReGen™ technology to produce 45% to 53% Group III base oil from used motor oil ("UMO") feedstock in addition to Group II base oil, ultralow sulphur diesel fuel, and asphalt flux from the other two stages in the ReGen™ process. As stated previously, the Company expects these independent studies, being completed by two of Canada's leading engineering firms, will confirm the capability of the revolutionary ReGen™ technology to produce significant volumes of Group III base oil. Upon completion of these two independent studies, which are projected to take 10 weeks to complete, the Company will select one of these firms to move forward with a full FEED study, from which the Company's Board of Directors will have the necessary information to decide if it should proceed with a change of business application to the TSX Venture Exchange ("TSXV") and proceed with constructing the proposed re-refinery. Both Stantec and WSP have been selected for this project following a rigorous process. Upon completion of their respective pre-FEED studies, each firm will submit a detailed proposal and will participate in the competitive bid process for the follow-on engineering work, which will include validation of the Company's current projected $85MM capital cost for a 2,800 barrel per day re-refinery. Santino Pasutto, Oil & Gas manager at Stantec stated, "Stantec welcomes this opportunity to put our specialized knowledge in this field to good work and is privileged to have been engaged in this innovative project. I know that for process engineers this is precisely the kind of project they envision when they decide to pursue this profession. We look forward to building our relationship with PNG, an invaluable industry partner seeking to help grow our economy in new and exciting ways by bringing this cutting-edge facility to Alberta." The Company believes that with current market prices for the commodity products that the re-refinery will produce, the project payback will be completed within the first year of plant operation. Additionally, the Company is in negotiation with UMO collection companies to provide the feedstock quantities necessary to support a 2,800 barrel per day re-refinery, as well as also commencing preliminary negotiations with potential purchasers for all of the off-take products that will be produced by the re-refinery. The Stantec community unites approximately 22,000 employees working in over 400 locations across six continents. Our work - engineering, architecture, interior design, landscape architecture, surveying, environmental sciences, project management, and project economics, from initial project concept and planning through design, construction, and commissioning - begins at the intersection of community, creativity, and client relationships. With a long-term commitment to the people and places we serve, Stantec has the unique ability to connect to projects on a personal level and advance the quality of life in communities across the globe. Stantec trades on the TSX and the NYSE under the symbol STN. Visit Stantec at www.stantec.com or find us on social media. As a Canadian multinational, WSP is one of the world's leading engineering consulting firms. A leader in transforming the built environment and restoring the natural environment, its expertise ranges from engineering iconic buildings to designing sustainable transport networks, to environmental remediation and urban planning, to developing tomorrow's energy sources and finding innovative ways to extract essential resources. Working with governments, businesses, architects and planners, it provides integrated solutions for all of the markets in which it operates. With 8,100 dedicated professionals in Canada, supported by a worldwide network of 36,500 experts spanning 40 countries, its teams are committed to helping clients succeed no matter how they grow, what they choose to do, or where they move. On Behalf of the Board of PNG Gold Corporation, Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release. Certain information set forth in this news release may contain forward-looking statements that involve substantial known and unknown risks and uncertainties, certain of which are beyond the control of PNG Gold Corporation. These include, but are not limited to, completion of the Financing, the receipt of TSXV acceptance of the Financing and the proposed use of proceeds of the Financing. Readers are cautioned that the assumptions used in the preparation of such information, although considered reasonable at the time of preparation, may prove to be imprecise and, as such, undue reliance should not be placed on forward-looking statements. The Company assumes no obligation to update forward-looking statements, except as required by applicable law.
Carpenter N.E.,University of Southampton |
Dickson M.E.,University of Auckland |
Walkden M.J.A.,WSP |
Nicholls R.J.,University of Southampton |
Powrie W.,University of Southampton
Marine Geology | Year: 2014
Geomorphic modelling is a key method to understand the soft cliff recession process to predict future rates of retreat and responses to climate change. A range of process-based models have been used; however the influence of varied vertical lithology has yet to be quantified. This paper describes modifications to the 2D SCAPE (Soft Cliff and Platform Erosion) model, carried out to explore such interactions between vertical changes in cliff resistive strength and prevailing coastal conditions. As expected, weaker (/more resistant) layers lead to more (/less) rapid retreat. However, this effect is strongly influenced by the position of such layers relative to mean sea level, where the erosive potential is greatest. Moreover, model simulations reveal that layers of variable resistance give an asymmetric response in terms of both rates of retreat and the timeframe for the effect to be realised. For example, a reduction of material strength of 1/5 (in comparison to the remainder of the cliff) about mean sea level results in a rapid 130% increase in the rate of retreat in comparison to the introduction of a five times more resistant layer of the same characteristics. This variation in response can be attributed to the different magnitudes of feedback governing profile reshaping associated with the change in lithology. For example, the introduction of a weaker layer amplifies erosion through its greater erosive potential combined with steepening of the overlying section. The results have important implications for the management of coastal cliffs exhibiting variable stratigraphy, combined with the potential for future interactions with sea-level rise. © 2014 The Authors.
Nilsson P.,WSP |
Engineering for Progress, Nature and People | Year: 2014
While upgrading Highway 27 in Sweden, a 47,4 m long arch bridge consisting of glulam was built. Due to architectural reasons, the aches were not allowed to be connected to each other above slab level. The moment transmitting joint between the vertical beam hanger and transverse girder results in U-shaped connections between the arches. A 13,9 m spacing of the arches made the design of this structural part challenging. Stability of the arches was especially considered, regarding both in and out of plane buckling due to vertical and horizontal loads. Dynamic factors for the wind load were calculated using a single mode principal. A stress-laminated timber slab made of glulam beams was used as the bridge slab. This glulam - steel hybrid structure consists of approximately 230 000 kg of untreated glulam and approximately 100 000 kg of steel.
Proceedings of Institution of Civil Engineers: Energy | Year: 2014
The Institution of Civil Engineers energy expert panel has published a series of status reports concerned with various forms of energy such as wind, hydro, nuclear and energy from waste. Designed to be both informative and contemporary, the reports are updated regularly to provide accurate information to a varied audience. The present report focuses on the current status of shale gas in the UK.
Musterait T.M.,WSP |
Musterait T.M.,HDR |
ICSI 2014: Creating Infrastructure for a Sustainable World - Proceedings of the 2014 International Conference on Sustainable Infrastructure | Year: 2014
The linkage between energy, water, wastewater and greenhouse gas (GHG) emissions has become an important topic for industrial manufacturing operations. Productivity initiatives across the industrial manufacturing sector are creating demand for energy and water programs that reduce operating costs and provide environmental benefits. Stakeholders are able to elevate the need for energy, water, and wastewater programs through various business drivers. Defining leading and lagging metrics are an important component towards successfully implementing an energy and water management program. Energy and water optimization opportunities identified in facilities may be more successful when evaluated outside the structure of a traditional energy-water nexus approach. Organizations are now considering the interaction of water optimization through reduction and reuse, energy consumption reduction and demand management, downstream waste management practices, and GHG emissions as an integrated approach. This paper presents perspectives on energy and water management program development and assessment. This includes strategic planning with a bottom up and top down approach for water and energy consumption reduction schemes, management of downstream waste and wastewater, and associated GHG impacts. © 2014 American Society of Civil Engineers.
Structural Engineer | Year: 2010
Strata SE1 is an example of truly integrated design that required full collaboration between client, contractors and various design team members. The distinctive form communicates a visible commitment to sustainable design and the strategy of peeling back the cladding and integrating the turbines, together with the adoption of a curvilinear envelope has provided London with a new landmark building.
Nall D.H.,Thornton Tomasetti |
ASHRAE Journal | Year: 2013
More than half of human water demands can be met with recycled nonpotable water, which opens up the possibilities for many water consumption reduction strategies. Recycled sources include HVAC condensate, rooftop storm water, gray (wash) water, and local sewage treatment plant effluent. Some of these are relatively clean, requiring only antimicrobial treatment, while others require filtration or removal of organic contaminants.
Carpenter N.E.,University of Southampton |
Dickson M.E.,University of Auckland |
Walkden M.,WSP |
Nicholls R.J.,University of Southampton |
Powrie W.,University of Southampton
Earth Surface Processes and Landforms | Year: 2015
This paper addresses a series of geomorphic questions relating to large-scale (> 1 km), long-term (100 - 1,000 years) coastal planshape evolution. Previous research on soft-cliff coasts has recognised the role of protective fronting beach volumes on reducing rates of cliff toe retreat. However, it is the maintenance of this critical threshold that ultimately determines two contrasting modes of shoreline behaviour: Mode A, in which there is little beach sediment and shoreline evolution is controlled by material strength; and, Mode B, when ample beach sediment means that shoreline evolution is controlled by longshore sediment transport. Here we use a numerical model (SCAPE) to investigate temporal and spatial changes in beach volume on a broader range of feedbacks than considered in previous models. The transition between Mode A and Mode B coasts is defined by relative sediment inputs to outputs and used to explore how these contrasting modes control the evolution of an initial linear frontage exhibiting longshore changes in cliff lithology (material resistance and the proportion of beach grade material in the eroded bedrock). Under Mode A, relative changes in material resistance result in long term heterogeneous rates of retreat, which result in the development of persistent headland and embayment features. However, under Mode B, feedbacks between coastal planshape, longshore sediment transport, beach volume and wave energy result in steady state retreat rates regardless of longshore variations in resistance. Results are compared and contrasted to previous simulations and site specific examples and a conceptual model of Mode A and Mode B interactions presented. © 2015 John Wiley & Sons, Ltd.