Monday, June 10, 2019
Time: 2:00 – 5:00 PM
Session Chair: Rachel Stiffler
Room: Woodrow Wilson A
The proprietary session will consist of 5 presentations. Discussions will center on the following topics:
- State of the art wind engineering and dynamic loading
- Nondestructive testing of high load multirotational bearings and insight into issues encountered while testing
- Information modeling for bridges including data exchanges and 3D bridge design.
- Case studies due to scour failure and prevention of future failures
- Incremental launching method for segmental concrete bridges citing overseas case study.
IBC 19-1: Automated Reinforcement of Bridges Under a BIM Perspective
Alexander Mabrich, Bentley Systems, Sunrise, FL
As a BIM workflow is embraced and software is used for the design and analysis of the bridge structure, project delivery slows down as the reinforcement detailing is mostly a manual drafting process. Usually the process of plans production and 3D modeling generation is not connected resulting in repetitive work with the consequence of losing productivity. The lack of automated 3D software solutions and experienced professional in the upcoming BIM workflow and 3D representation of our structures contribute to the fact that organizations still resort to manual process for detailing. The purpose of this paper is to analyze the advantages of using 3D models for rebar bridge detailing and the challenges it presents to organizations the implementation of this new workflow into their bridge projects.
IBC 19-2: Incremental Launching Method for Cayirköy Bridges
Francois Pissot, Giulio Maria Scotto, and Julien Erdogan, Freyssinet, Rueil Malmaison, Veuillez Sélectionner, France
Çayirköy viaduct is part of the Northern Marmara motorway, an alternative road to link the western part of the country to Istanbul via the 3rd Bosporus Bridge. The 750m long viaduct, made of two carriageways, cross a valley at more than 60m high. This paper gives an overview of the construction methods of this viaduct and focuses on its specificities. The major ones are earthquake loads to be considered during construction and the launching downhill with a – 2.8% slope. The incremental launching method (ILM) has been completely rethought to be adapted to this viaduct. A system has been designed to block the deck during stop phases against earthquakes, but also to brake it during launching phases. Temporary structures associate to ILM will also be described in this paper, as one of the challenges was to adapt equipment from previous projects.
IBC 19-3: State-Of-The-Art Wind Engineering for Bridges
Jens Moeller-Madsen and Svend Ole Hansen, SOH Wind Engineering LLC, Williston, VT ; Kristoffer Hoffmann, Svend Ole Hansen ApS, Copenhagen, Copenhagen V Denmark
From record breaking long span bridges to pedestrian walkways – dynamic loads play a critical role in the design and serviceability of bridges. At SOH Wind Engineering we have extensive experience with dynamic loading on bridges of all sizes from model scale wind tunnel testing, over theoretical studies to full-scale measurement of dynamic properties and the design and manufacturing of vibration dampers. We have worked suspension bridges with spans longer than the longest presently constructed in the world and pedestrian bridges with spans of the order of 50-100 m. Our experience enables us to provide a range of services of relevance to bridge owners, contractors, and engineers. Through state-of-the-art examples of wind engineering and dynamic loading studies we will attempt to demystify how theoretical studies, model scale experiments and full-scale measurements are used to assess aerodynamic stability, the effects of retrofits, traffic safety and comfort, the need for and effect of dampers, construction stage loading and structural response, cable vibrations and mitigation measures considering the effects of rain, ice and snow.
IBC 19-4: Case Studies of Bridge Failure due to Scour and Prevention of Future Failures
Roger Simpson, Ph.D. and Gwibo Byun, Ph.D., AUR, Inc., Blacksburg, VA
For US bridges over water, 70% are NOT designed to withstand scour, 21000 are currently “scour critical”, and 80% of bridge failures are due to scour, often during floods and peak flow events which are becoming more common with climate change (Flint et al., 2017). Lin et al. (2013) examined 36 bridge failures due to scour in terms of structural, hydraulic, and geotechnical conditions. Local scour, channel migration scour, and contraction scour were responsible for 78% of failures. Sadly, many lives were lost during these failures. ALL bridge scour failures are produced by large-scale scouring vortices formed at piers and abutments that bring high velocity water down to the river bed. Since the scouring forces on the bed material vary with the SQUARE of the local velocity, it is clear that the best scour countermeasure is to Prevent the scouring vortices. The purpose of this paper is to show that scouring-vortex- preventing designs would have prevented ALL of the bridge scour failures and will prevent future failures at all flow speeds. Designs for various types of piers, footings, abutments, angles of attack, river swirl, and bed conditions have been tested at model scale and some at full scale and show no scouring vortices. Computational fluid dynamic studies show that no scouring vortices are produced. Other advantages of these designs are: much lower present value of all costs, lower river levels and flow blockage, lower possibility for debris and ice buildup, and greater protection of piers and abutments against impact loads.
IBC 19-5: Non-Destructive Testing on High Load Multirotational Bearings
Ronald Watson, R.J. Watson, Inc., Alden, NY
High Load Multirotational Bearings (HLMRB) provide the critical function of transmitting loads, rotations and movements from the superstructure of a bridge to its substructure without any damage. Most of the owner specifications call for lot testing of these bearings which typically include friction, vertical load, horizontal load and rotation verification. In addition, many states are now requiring long term deterioration rotation testing which can be a long and arduous process. This paper will present the state of the art in non-destructive bearing testing and illustrate the issues surrounding testing of bearings that can be as large as ten feet square and weigh over 20 tons. Some of the facilities that perform these tests will also be highlighted.
W-1: Practical Approaches and Tools for the Design of Steel Bridges
Time: 2:00 – 6:00 PM
Michael Baker International
This Workshop will address various aspects of steel bridge design and demonstrate practical approaches that incorporate current specifications and industry trends. The workshop will include presentations covering key concepts and steel bridge design theory, as well as hands-on participant exercises and calculation examples. Emphasis will be placed on recent developments in the AASHTO code related to steel bridge design, and participants will obtain valuable examples and instruction on how to approach key elements of steel design.
Speakers: John Dietrick, P.E., S.E., Michael Baker International, Cleveland, OH; Frank Russo, Ph.D., P.E., Michael Baker International, Philadelphia, PA
W-2: New Design Standards and Worldwide Innovative Applications Using FRP Composites to Build Bridges
Time: 2:00 – 6:00 p.m.
American Composites Manufacturers Association
This workshop is intended to capture significant FRP composites initiatives on a global scale. We will cover two recently published design guidelines – the new AASHTO LRFD for GFRP reinforced concrete and UK European bridge design specification. Presentations will also cover recent MODOT testing and approval of innovative bridge systems that meets AASHTO requirements, 15+year durability performance study of FRP rebar, and worldwide examples of bridge installations used in both new and retrofit construction from the US, Europe, Canada, and Australia.
Speaker: John Busel, F.ACI, American Composites Manufacturers Association, Arlington, VA