Scientific Program

Conference Series Ltd invites all the participants across the globe to attend 4th World Congress and Exhibition on Construction and Steel Structure October 16-18, 2017 Atlanta, USA.

Day 1 :

Keynote Forum

Eiki Yamaguchi

Kyushu Institute of Technology, Japan

Keynote: Influence of collision damage on load-carrying capacity of steel girder

Time : 9:45-10:15

OMICS International Steel Structure 2017 International Conference Keynote Speaker Eiki Yamaguchi photo
Biography:

Eiki Yamaguchi has earned his PhD at Purdue University, USA. He is currently the Vice President and Professor at Department of Civil Engineering, Kyushu Institute of Technology, Japan. He has published more than 100 papers and serves as Editorial Board Member of Journal of Constructional Steel Research and International Journal of Advanced Steel Construction as well as international advisory committee member of several international conferences.

Abstract:

It happens sometimes that a truck running on a highway collides with the main girder of a bridge over the highway. The influence of the damage due to collision on the mechanical behavior of the bridge has to be evaluated for the safety of traffic on the bridge. Yet it is not always an easy task, since the mechanical capacity of a deformed girder has not been studied much. One of the authors has been involved in the safety evaluation of a steel girder bridge damaged by collision. The bridge consisted of two steel main-girders and one of them looked badly damaged: the web was deformed outwardly; some transverse stiffeners were buckled; some other stiffeners were separated from the web; and bolted connections between some lateral struts and the web were broken. Making use of the information on the actual damage, the collision load is estimated by the finite element analysis and the deformation of the main girder is reproduced. The load-carrying capacities of the main girder without
damage, the main girder damaged by collision, the main girder with larger damage are then studied numerically. The results indicate that the damage influences the load-carrying capacity, but the influence is limited even though the deformation is much larger than the fabrication error allowed in the bridge design codes.

Keynote Forum

Sukhvarsh Jerath

University of North Dakota, USA

Keynote: Influence of road surface and vehicle dynamics on bridge design

Time : 10:45-11:15

OMICS International Steel Structure 2017 International Conference Keynote Speaker Sukhvarsh Jerath photo
Biography:

Sukhvarsh Jerath has obtained his PhD from the University of Illinois, Urbana-Champaign in 1977. He is currently a Professor and Chair of the Civil Engineering Department at the University of North Dakota, USA. He has also done research at the US Army Construction Engineering Research Laboratory (CERL) and Oak Ridge National Laboratories (ORNL) for short period of times in addition to consulting for the industry. He is a Fellow of the American Society of Civil Engineers (ASCE) and Professional Engineer in the states of Illinois, Indiana, Minnesota and North Dakota. He was selected as a Fulbright Scholar by the US State Department, Washington, DC from December 2014 to May 2015 to teach and research at the Indian Institute of Technology Bombay (IITB), Mumbai, India. He is currently writing a graduate level text in structural stability.

Abstract:

The impact factor for moving vehicles on a bridge is calculated by the AASHTO formula: I=50/L+125, where ‘I’ is the impact factor with a maximum value of 30%, ‘L’ is the length in feet of the portion of the span that is loaded to produce maximum stress in the member. Impact factor given by AASHTO depends only on the span length of the bridge, whereas road surface profile, weight, speed, dynamics of a vehicle and bridge geometry all affect the impact factor when moving loads are traveling on a bridge. We conducted a study to calculate the increased forces that act on a bridge deck by considering the road surface roughness and vehicle dynamics for an AASHTO HS20-44 truck at various speeds. The vehicle is considered running on a very good road whose roughness is found by using the power spectral density function. The AASHTO truck is modeled as a 12 degree of freedom system to consider the vehicle dynamics. The AASHTO truck is modeled to contain five rigid masses of tractor, trailer and three masses of steer, tractor and trailer wheel axles. The equations of motion are derived using Lagrange’s
formulation consisting of the masses, the damping and spring forces in the suspension systems of the axles and in the tires. The equations of motion are solved using the road surface roughness and the vehicle dynamics to give the tire forces that are coming on the bridge deck. The dynamic tire forces so calculated are higher 24.72% for the trailer axle tires to 51.70% for the tractor axle tires than the static tire forces due to the weight of the truck only when the speed of the vehicle is increased from 40 to 90 mph (64 to 144 km/hour). Bridge decks act differently in longitudinal and transverse directions because of their structural configuration and hence can be modeled as orthotropic plates. The dynamic tire forces are used to find the maximum vertical deflection in the center of a T-beam bridge deck when the AASHTO vehicle is moving at different speeds by using the orthotropic plate theory and finite element method. The static deflection is also found for the corresponding point of the bridge. The increase in the vertical deflection considering road surface roughness, vehicle dynamics, speed and the bridge geometry is used to find the impact factor. The impact factor varied from 36.81% to 43.96%, whereas the impact factor from the AASHTO formula is 21.05% for the bridge considered, which is smaller than the impact factor if all the factors involved were considered.

Keynote Forum

Ryoichi Kanno

Nippon Steel and Sumitomo Metal Corporation, Japan

Keynote: Recent advancement of steel materials for construction and their future trends

Time : 11:45-12:15

OMICS International Steel Structure 2017 International Conference Keynote Speaker Ryoichi Kanno photo
Biography:

Ryoichi Kanno is currently a Fellow of Research & Development, Nippon Steel and Sumitomo Metal Corporation in Japan. His research interests include a wide variety of topics related to steel structures such as structural steels, composite structures, cold-formed steel structures, bolted connections, buckling behavior of steel members, etc. He has served several technical committees in the Architectural Institute of Japan (AIJ) and the Japanese Society of Steel Construction (JSSC). His major awards obtained recently include the Shiraishi Award from the Iron and Steel Institute of Japan (ISIJ) and Paper Award from the the JSSC. He has also contributed to university education and research as a part-time Lecturer at Waseda University and a visiting Professor at Kanazawa University. He completed his PhD at Cornell University in 1993. 

Abstract:

It is common knowledge that the first structure made of steel-based materials is the Iron Bridge built in the UK in 1779. The material is cast iron that contains a relatively large amount of carbon; therefore, it behaves in a brittle manner. With a gradual improvement of the material properties through various process innovations, steel structures have currently become one of the most widely used structural systems for bridges and buildings. Among the various countries in the world, Japan has become one of the most advanced countries in the construction of steel structures. Diverse innovative steel structures were constructed in the past such as the world’s longest suspension bridge, the Akashi Kaikyo Bridge. These advances of steel structures are, in fact, attributed to a significant extent to the development of high-performance steels. Such materials developed in Japan were characterized by three types of versatilities: strength, functional, and sectional. Some examples of such materials include fairly high and low strength steels, high-bridge performance steel, seismic-resistant steel, fire-resistant steel, corrosion-resistant steels, and size-flexible H-shaped beams. In Japan, these steel material innovations enabled the progress in steel structures to leap forward and in turn challenging new structures gave birth to further advancements in steel materials. In this presentation, the advancements of steel structures and materials are reviewed, focusing on the steel materials and their contributions to
the construction of steel structures. In addition, in light of recently developed innovative steels and their strength-increasing potential, the further advancements of steel materials are suggested and discussed for the future innovations of steel structures. 

Keynote Forum

Damith Mohotti

University of Sydney, Australia

Keynote: Effective use of steel composites in blast and impact load damage mitigation

Time : 12:15-12:45

OMICS International Steel Structure 2017 International Conference Keynote Speaker Damith Mohotti photo
Biography:

Damith Mohotti is currently working as a Lecturer in the School of Civil Engineering at the Faculty of Engineering and IT at University of Sydney, Australia. He currently works as a Member of the Industrial Engagement Committee of the school and hold the responsibility of delivering three key units of studies on design of concrete and pre-stressed concrete structures. In addition to his expertise as a Researcher, he has gained worthy of experience working as a Structural Engineer and a Consultant. He is a Member of International Association of Protective Structures (IAPS), Concrete Institute of Australia (CIA) and Engineers Australia (EA).

Abstract:

The response of structural systems and elements subjected to blast and impact loadings have been broadly investigated both experimentally and numerically. However, the response of steel composite or multilayered structural systems subjected to extreme loadings have received less focus within the research community. With the increasing demand towards lightweight composites in structural applications, focus of using steel in conjunction with other lightweight materials has come in to elite within the last few years. The damage caused to a structure by a blast wave is primarily dependent on its ability to absorb the released energy. Therefore improvements of energy absorption techniques in steel and composite structures are important in designing such structures for survivability under those extreme loadings. Recent work done on steel-polymer composites in blast and impact load damage mitigation shows great potential of using such structural systems in the future applications. 

Keynote Forum

Brian Uy

Professor and Director

Keynote: Future trends in the design and construction of steel and composite infrastructure

Time : 10:15-10:45

OMICS International Steel Structure 2017 International Conference Keynote Speaker Brian Uy photo
Biography:

Brian Uy is Professor of Structural Engineering and Director of the Centre for Infrastructure Engineering and Safety (CIES) in the School of Civil and Environmental Engineering at The University of New South Wales in 2013.  He has co-authored over 600 publications including over 150 journal articles.  He has delivered over 250 conference papers in 35 countries, including over 60 keynote/invited lectures in 15 countries and has been involved in research in steel and composite structures for over 20 years. Brian is Chairman of the Standards Australia Committee BD32 on Composite Structures which is currently preparing the Australian/New Zealand Standard AS/NZS2327 on composite structures for buildings.  He has been the Chairman of the Australia Regional Group of the Institution of Structural Engineers since 2012 and the Chairman of the Australia Group of the International Association for Bridge and Structural Engineering (IABSE) since 2015. Brian is Chief Editor (Asia-Pacific) for Steel and Composite Structures and serves on the Editorial Board of Journal of Constructional Steel Research and Advanced Steel Construction. He also currently serves on the American Institute of Steel Construction (AISC) Task Committee 5 on Composite Construction and the IABSE Working Commission 2 on Steel, Timber and Composite Structures

Abstract:

This paper will look at trending technologies and techniques in the design and construction of steel and composite infrastructure.  The paper will focus on the broad categories of bridge and building infrastructure and the past, present and future practices.  In particular the issue of the reduction, reuse, recycling and rethinking (4 R’s) as it applies to the use of steel in steel and composite infrastructure will be addressed.  Particular focus will be made in the paper in looking at connections in steel and composite infrastructure in addressing the 4 R’s.  In addition the issue of advanced materials, particularly for steel and concrete for beams, columns, joints, slabs and systems will be a focal point for the paper. The paper will conclude with some salient examples of these advances as they have been addressed in American, Australian and European Codes of Practice.