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Yu H.,Landmark Group of Builders | Al-Hussein M.,University of Alberta | Al-Jibouri S.,University of Twente | Telyas A.,Kullman Building Corporate
Journal of Management in Engineering | Year: 2013

Encouraged by the remarkable productivity improvements in the manufacturing sector, the construction industry has a long history of trying to garner the benefits of manufacturing technologies. Whereas industrialized construction methods, such as modular and manufactured buildings, have evolved over decades, core techniques used in prefabrication plants vary only slightly from those employed in traditional site-built construction. The objective of this research was to develop and implement a production system for the effective application of lean tools in building components prefabrication. To overcome the prevalent skepticism among middle management, the lean journey started with a pilot project involving one production line. Over a six-month period, lean tools such as 5S (sort, straighten, shine, standardize, and sustain), standardized work, takt time planning, variation management, and value stream mapping were implemented to a communication shelter production line. The implementation successfully won the support of the middle managers and established the foundation for expanding lean practices to other parts of the factory and applying relevant lean tools and techniques. © 2013 American Society of Civil Engineers. Source

Hamdan S.B.,University of Alberta | Barkokebas B.,University of Alberta | Manrique J.D.,Landmark Group of Builders | Al-Hussein M.,University of Alberta
32nd International Symposium on Automation and Robotics in Construction and Mining: Connected to the Future, Proceedings | Year: 2015

Off-site construction is gaining more consideration from builders in North America, as it provides better quality products in less time and cost. Panelized construction is an increasingly popular off-site construction method in which panels are fabricated off site, then transported to the site for assembly. In this approach, panels are typically manufactured at a rate that exceeds that of on-site assembly of the panels, which necessitates inventory management of the fabricated panels awaiting transportation to the site for assembly. Effective inventory management is thus required in panelized construction to reduce costs. The randomness of the manufacturing and assembly process entails processing a large amount of information iteratively in order to select the proper production scenario to effectively manage the inventory. In this context, simulation provides an appropriate means of testing proposed scenarios in a timely manner. Simulation models require precise information, and building information modelling (BIM) provides a convenient and comprehensive means of data exchange among different environments. This paper thus presents a combination of discrete-event and continuous simulation that uses the information extracted from the BIM model to facilitate inventory management for panelized construction. This approach develops a schedule and ensures continuity and smoothness of the workflow. Source

Barkokebas B.,University of Alberta | Hamdan S.B.,University of Alberta | Al-Hussein M.,University of Alberta | Manrique J.D.,Landmark Group of Builders
32nd International Symposium on Automation and Robotics in Construction and Mining: Connected to the Future, Proceedings | Year: 2015

The current on-site (stick-built) construction process is hampered by inefficiencies and limited in terms of opportunities for technological innovation. The efficiency of on-site construction practice is contingent upon the effectiveness of the specific model used to communicate information. Architects use CAD models to develop a project design, while construction engineers use management tools and spreadsheets to assist in project estimating control and integration. Today, the efficiency of this process is dependent upon the ability of project participants to interpret these discipline-specific models in order to form mental pictures of a proposed design and manually perform material take-offs and estimating. This process contributes to misinterpretation and subsequent estimating errors. Advanced computer tools can be used to prepare smart designs which integrate these models and coordinate the crossdisciplinary tools used for design and cost estimating. The research described in this paper is intended to support the industrialized (manufactured) construction process of residential buildings, coordinating cross-disciplinary knowledge through the utilization of building information modelling (BIM)-based 3D-paremateric modelling. A case study is also presented in this paper in order to illustrate the effectiveness of the methodology and highlight potential applications of the 3D BIM model. Source

Younes B.,University of Alberta | Bouferguene A.,University of Alberta | Al-Hussein M.,University of Alberta | Yu H.,Landmark Group of Builders | Ajweh Z.,University of Alberta
Proceedings, Annual Conference - Canadian Society for Civil Engineering | Year: 2013

Construction contractors stipulate payment terms for invoices submitted. These terms are often ignored, in which case invoices are paid late, leading in the long-term to lost profit and compromised relationship and reputation for both contractors and owners. Two particular challenges are identified in this research: (1) delayed payment of invoices and (2) inefficient processing of invoices. Considering that for a typical construction firm invoice processing involves a number of full-time employees and several stages, the effect of inefficient invoice processing on project cost cannot be ignored. From the construction owner's perspective, ensuring on-time payment of invoices, even when funds are available, can be a challenging exercise because of the variety, volume, and the unpredictable nature of demand for the invoices to be processed. As a result, it is paramount for owners to implement not only processing protocols which will ensure efficient treatment of invoices but, more importantly, quality assurance procedures which will minimize the amount of rework in the process. The approach proposed in this paper considers invoice processing as a supply chain to which Lean manufacturing principles and simulation are applied in order to reduce (or ideally, eliminate) waste in the process, thereby achieving a steady-state supply chain with minimal queuing and processing time. Source

Awad H.,University of Alberta | Gul M.,University of Alberta | Zaman H.,University of Alberta | Yu H.,Landmark Group of Builders | Al-Hussein M.,University of Alberta
Energy and Buildings | Year: 2014

Approximately 30% of energy use in Canada is consumed in buildings, specifically space heating, which can be reduced by constructing thermally-resistant building envelopes. This study evaluates potential innovative energy-efficient wall systems for mid-rise (four to six storeys) wood-frame buildings in terms of thermal and structural performances. Regarding the thermal resistance performance, four wall systems are developed, installed in a full-scale test house, and examined, along with a baseline wall system, using the field data collected. The selection of the wall systems is based on current practice, structural analysis, pre-fabricability, and energy-efficiency. Several sensors are installed on each wall system to measure temperature, heat flow, and relative humidity. In addition, structural tests are conducted to determine the compressive loading capacity of the tested wall systems for both concentric and eccentric loads, where full-scale panels are constructed and tested in laboratory. As a general finding, all the tested wall systems achieved ASHRAE's minimum assembly R-value recommendation of RSI 3.45, where the I-joist wall system had the highest R-value, while the conventional wall system had the highest load-bearing capacity. This paper recommends I-Joist wall systems for their higher energy efficiency suggesting more future research on efficient end connections to achieve consistent structural performance. © 2014 Elsevier B.V. All rights reserved. Source

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