T.Y. Lin Lecture
Bridge maintenance, renovation and management - R&D governmental program in Japan
YOKOHAMA NATIONAL UNIVERSITY, YOKOHAMA, JAPAN
The collapse of Sasago Tunnel located on the Chuo Expressway about 80 kilometers west of Tokyo in 2012 has led to doubts about the current quality and safety of infrastructure, and immediately brought public attention to the issue of infrastructure degradation in Japan. Japanese government decided to invest on research and development for efficient management of infrastructure through implementation of science and advanced technology. The emphasis is placed on bridges. The new R&D program named “Infrastructure maintenance, renovation and management” is started in 2014 under the Council of Science, Technology and Innovation (CSTI)‘s Strategic Innovation Program (SIP). The 5-years program covers various subjects of infrastructure maintenance with key technologies in condition assessment using non-destructive testing, monitoring and robotics; long-term performance prediction of infrastructure, development of durable high-quality of material for repair and replacement, and management of large amount of bridges and other infrastructure data using advanced information and communication technologies (ICT). The program consists of about 60 research projects involving universities, government research institutes and industries. This initiative is expected to prevent further accidents and setting an example for efficient bridge and infrastructure maintenance by reducing the burden of maintenance works and cost. In the lecture, outline and major output of this SIP program are explained.
A Vision for Vision-based Technologies for Bridge Health Monitoring
UNIVERSITY OF CENTRAL FLORIDA, ORLANDO, FL, USA
Condition assessment of bridges evolved over the years with the advances in non-destructive evalua-tion technologies, field tests and structural health monitoring. As a result, technological advances changed the resources that bridge engineers can tap intol; however, the requirement for practical, low-cost and effective approaches has remained the same. The writer and his research team have ex-plored vision-based technologies to fulfill such re-quirements. In this paper, first the vision-based tech-nologies will be presented along with capabilities and limitations. It is also important to recognize that the views of different stakeholders in terms of their needs and expectations from non-destructive evalua-tion and structural health monitoring technologies show variations. In the second part of the paper, re-sults from a survey study are presented based on communications and interviews with infrastructure owners and engineers working in the area of inspec-tions, maintenance and decision-making. Finally, some solutions and example applications will be pre-sented with particular emphasis on the use of vision-based technologies while addressing the needs iden-tified through the survey.
Managing Existing Bridges – On the Brink of an Exciting Future
INFRASTRUCTURE MANAGEMENT CONSULTANTS GMBH, ZÜRICH, SWITZERLAND
In course of bridge design and construction, computational models are developed, by means of which behavior of newly constructed bridges exposed to various combined actions can be determined. Relevant combinations of these actions are referred in Eurocode as design situations, against which the safety and serviceability of bridges are checked. The wealth of information acquired on each specific bridge during the design and construction is currently not being exploited effectively during the service life of these bridges. After the reception of newly designed bridge this information is handed over to the bridges’ owners or operators that act further on as their trustees. However, in most cases they don’t have tools and resources to use this information efficiently. During the service life, the owners and/or operators are bound to monitor the condition of bridges and their ability to perform as required. To this end inspections are performed that document observable changes from as-new condition. It is a common practice to evaluate condition state of a bridge and/or its elements qualitatively using an ordinal scale. The condition state expresses a vague measure for the deviation of inspected bridge from “as new” condition that is, at best, loosely correlated to safety and serviceability. If this vague measure reaches some threshold further investigation can be triggered that build upon the models – if these are still available - developed during the design and construction. Even if the models are available the effort to understand and restore all necessary information may be substantial. If the documentation of a bridges is lost or is of insufficient quality, the assessment effort may reach the one of the original design.
Smart combination of increasingly sophisticated Bridge Management Systems, Bridge Information Models and Structural Health Monitoring has a potential to bring bridge management to a completely new level. The future Bridge Management System (fBMS) are to be based upon semantically rich Bridge Information Models that entail a suitable geometry of a bridge together with material properties and structural systems. Observations during inspections as well as monitoring data can be directly introduced in fBMS and allow effective updating of safety and serviceability. If embedded in a Geographical Information System, simulation of hazard situation can be performed that would allow contingency planning in case of extreme events. Finally, these models can be useful as a part of an early warning system during the unfolding of extreme events.
Clearly, the owners and/or operators must provide both financial and personal resources to maintain a fBMS and its data. Owners need in-house competence both in structural and decision engineering similar to the banking sector, where competence in financial and decision engineering is required. It is not a coincidence that in both sectors the term “Asset Management” is widely used.
The lecture will give a sneak preview into this exciting future management of existing bridges, which at least in the research arena has been already launched.
DESIGN CONCEPT OF THE TWIN RIVER BRIDGES IN CHONGQING, CHINA
TY LIN INTERNATIONAL, SAN FRANCISCO, CA, USA
The metropolitan area of Chongqing is bisected by two rivers, the Yangtze and the Jialing, into three parts: Nanan in the south, Yuzhong in the middle and Jiangbei in the north. The Twin River Bridges is a pair of cable supported girder bridges: the Dongshuimen Bridge crosses the Yangtze River from Nanan to Yuzhong, while the Qianximen Bridge crosses the Jialing River from Yuzhong to Jiangbei. The two bridges are also connected by a tunnel under the entire Yuzhong District. The area is the most visible location of the city so aesthetics was the most important aspect in the design. The bridges carry four lanes of city traffic and two tracks of rapid transit which has very stringent design requirements. The bridges are designed based on the concept of partially cable-supported girder bridge. This paper describes the development of two alternative design concepts proposed and the final construction of this pair of bridges.
- Key Dates
- Call for Abstracts Closed
- Registration Open September 2017
- Notification of Acceptance of Abstract 1 September 2017
- Full Paper Submission open 1 September 2017
- Full Paper Final Submission Deadline 20 October 2017
- Notification of Full Paper acceptance December 2017
- Final Paper SubmissionJanuary 2018
- Early bird Registration closes March 2018
- Conference 9-13 July 2018
IABMAS 2018 Hosted by