4th World Congress and Exhibition on Construction and Steel Structure 2017-10-16 October 16-18, 2017 Atlanta, USA

Ahmed Syed is a Professor and Chairperson of the Department of Construction Management at East Carolina University. He has over 30 years of international experience in teaching, research and consulting. His areas of interest includes construction scheduling, quality and risk management, and project controls. He is the Author of four books and has also published extensively (over 150 publications) in international journals and conferences. He is on the Editorial Board of more than six international journals and serves as the Associate Editor of ASCE, Journal of Construction Engineering and Management and Built Environment Project and Asset Management Journal.

The construction industry is continuing to grow and its contribution to GDP reaching a high of 784.1 USD Billion in 2016 (Bureau of Economic Analysis (BEA), 2017). The construction industry is constantly changing with improvements to technology, safety, the environment, and economics. As one of the leading industries, employers are striving to make new advancements in the field (BEA, 2017). The objective of this paper is to systematically review the current literature on trends in the construction industry. An in-depth review of construction management articles was conducted to determine what issues and trends are emerging in the construction industry. The literature review found an array of articles on topics such as technology, safety, the environment, and economics. After determining the important issues and trends, a review was conducted

to discuss how the construction industry is adapting to these changes. As the world continues to evolve with the changing economy and environment, the construction industry needs to continue to keep up with these changes. Recommendations are provided based on the review for future growth and trends of the construction industry.

Milan Veljkovic is a full Professor of Steel and Composite Structures at Delft University of Technology where he moved from Lulea University of Technology in Sweden from a similar position, in October 2015. He has published more than 100 peer reviewed papers and has been serving as a Member of Editorial Boards of four international journals. He is the Chairman of Technical Management Board of the European Convention for Constructional Steelwork. He has delivered invited lectures on various occasions in USA, Europe, Asia and Africa. He is Member of European Standardization Committee CEN250/SC3 Steel Structures.

Innovation in the field of reusable buildings is gaining growing attention in the Netherlands and other EU countries. This is driven by a policy documents for European economy unil 2020 and after adoption of a circular economy package in 2015. One of very competitive solutions for buildings is a composite structure consisting of a steel frame and concrete decks. The steel skeleton frame is rather obvious choice for structural system that satisfies all criteria for design for deconstruction (DfD). However, a composite floor system consisting of steel beams and concrete decks connected by welded shear studs is time consuming for demounting, and impossible to re-use. Large potential of achieving a completely reusable composite floor system is illustrated on a practical example using rather large concrete prefabricated decks and long span beams. The key component is a new type of shear connectors embedded in the concrete and in-situ connected to a steel beams with a flexible

execution tolerances. Analysis is performed using advanced FE models to predict behaviour of the connectors and propose a design that complies with structural requirements of ductility and strength according to Eurocode for composite structures. Engineering FE models based on elastic analysis are used to validate structural performance of the new system during the execution and at the service load.

M Shahria Alam is an Associate Professor in the School of Engineering at The University of British Columbia’s Okanagan campus. He received his PhD in Civil Engineering from Western University in 2008. His research interests include smart materials and their structural applications in bridges and buildings; seismic isolation devices, seismic rehabilitation of structures; performance-based design; recycle/reuse of industrial wastes. He is the Vice-Chair of the Engineering Mechanics and Materials Division of Canadian Society for Civil Engineering (CSCE). He has published more than 150 peer reviewed articles. He is also the recipient of many national and international awards including CSCE Pratley Award 2015 and UBC Moldovan Memorial Award 2014.

Buildings with traditional structural systems experience large residual deformation after a large magnitude earthquake, and often lose serviceability and need to be demolished incurring huge economic losses. In order to resolve this issue, various smart structural systems have been developed by researchers. One such system is the novel piston based self-centering bracing (PBSC) system. This study investigates the cyclic performance of this bracing system to determine its load-deformation response during seismic events. This newly developed bracing system utilizes Nickel Titanium (NiTinol) based shape memory alloy (SMA) bars inside a sleeve-piston assembly for its self-centering mechanism. During cyclic tension-compression loading, the bars are pulled from opposite directions in order to avoid compressive loading on the bars. The energy dissipation is achieved through nonlinear load deformation hysteresis. Furthermore, the PBSC bracing system is designed to be fully buckling restrained. The system exhibits flag shaped force deformation hysteresis. A novel hysteresis model is proposed from the simulated hysteresis response of the PBSC bracing system. This hysteresis model is implemented in a commercial structural analysis and design software called S-FRAME. Then the seismic performance of braced frames equipped with such PBSC bracing system has been evaluated. First, overstrength and force reduction factors are determined using FEMA P695 methodology. Using these factors, PBSC braced frames are designed and their seismic performance is evaluated in terms of inter-story drift responses and also compared against buckling restrained braced frames using fragility function. Finally, this research presents a step by step design methodology for the PBSC bracing system.

Gianluca Ranzi is currently an ARC Future Fellow, Professor and Director of the Centre for Advanced Structural Engineering at the University of Sydney Australia. His research interests range from the field of Structural Engineering with focus on computational mechanics, behavior and design of steel, concrete and composite steel-concrete structures to architectural science, heritage conservation and high-performance buildings.

The Generalized Beam Theory (GBT) is a powerful tool for the elastic and buckling analysis of thin-walled members (TWM). The basic idea of the method consists in describing the displacement field of the TWM as a linear combination of assumed deformation modes of the cross-section (including in-plane and warping components) and amplitude modes, which are unknown functions depending on the axial coordinate. This approach falls within the Kantorovich’s semi-variational method because of transforming a three-dimensional continuous problem into a vector-valued one-dimensional problem. The use of the GBT requires the execution of two main steps: (1) The identification of a suitable set of deformation modes capable of describing the cross-sectional behavior, referred to as cross-sectional analysis and (2) The member analysis that determines the amplitude values defining the intensity of the deformation modes along the member axis. In this context, the novelty of the proposed approach relies on the use of the dynamic modes of the cross-section as the basis of the GBT deformation modes. In particular, the dynamic analysis is performed on a planar frame that represents the cross-section and this procedure enables the evaluation of the conventional, extension and shear modes. The proposed approach is applicable to open, closed and partially-closed cross-section. After providing a brief description of the D-GBT method, its ease of use is demonstrated considering a number of case studies.