Papers by Keyword: Bridge

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Authors: Carlo Pellegrino, Mariano Angelo Zanini, Paolo Zampieri, Claudio Modena
Abstract: The outcomes of an in-situ experimental campaign in the context of the seismic assessment of 71 existing road bridges belonging to the Veneto regional roadway network have been described. An in-situ and laboratory experimental campaign on basic materials was carried out with the aim of characterizing the main mechanical material parameters of each bridge. Structural assessment has been subsequently carried out, comparing the obtained results with those deriving from a preliminary analysis conducted on the basis of some assumptions on materials’ mechanical characteristics related to the original design documents and the construction practice at the time of the structures’ edification.
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Authors: Giorgio Bignotti
Abstract: The Mormanno traffic Bridge, built at the end of the year 2000 in South Italy, with its glulam exposed structure spanning around 70 m, is one of the most impressive traffic timber bridges in the world. The paper illustrates the various analysis executed for the assessment of the health of the structure and for the following maintenance actions during the first twelve years of service of the Bridge (2001-2013). In the year 2004 a first visit for the assessment of the health of the timber bridge was decided. A team of experts inspected the bridge in order to check the conditions of the timber structures and register all the damages produced by weathering, fungi and insects on the structural elements. The experts found the decay still limited but recommended a maintenance action capable to stop the initial degenerative process mainly due to a moisture content higher than normal. In the year 2008 [ a new inspection team visited the bridge for the second time in order to check the effectiveness of the measures of protection adopted four years before. Non-destructive testing were used to investigate the health of the main glulam arches. The decay in the members object of the previous maintenance in general had stopped or slowed down, but in some other parts the moisture content was still higher than acceptable and more protections were added. In the following years the maintenance was completed giving the bridge the possibility to extend its service with a sufficient level of safety. The frequent inspections of the bridge structure provided useful information for the maintenance of the Mormanno bridge but also in general for the design of the durability and for the maintenance planning of exposed timber structures. Fig. 1 the Mormanno Bridge in service
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Authors: Hao Zhang
Abstract: Combined with the construction survey of the large-scale bridge, the essential precision is discussed for GPS control network of Highway Bridge. The method of constrained adjustment for GPS network is highlighted to assure the reasonable link of centerlines between the highway and the bridge.
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Authors: Yang Zou, Shui Xing Zhou
Abstract: The bridge infrastructure is critical to both political and economic development and Building Information Modelling (BIM) is now an innovative technology for bridges’ planning, design, construction and operation. However, it is currently difficult to achieve BIM’s practical value in bridge industry due to existing barriers. The focus of this paper is on proposing a new implemented BIM framework for bridge engineering. Particularly, the research project discussed and summarized the barriers which affect effectiveness and collaboration existed in traditional bridge project delivery and proposed a detailed BIM framework based on the traditional workflow to embrace collaboration and interoperation in the whole lifecycle of a bridge. The framework can significantly facilitate integrating BIM tools and practices, and increase the collaboration and productivity throughout the whole process of a bridge.
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Authors: Mairéad Ní Choine, Alan O’Connor, Jamie E. Padget
Abstract: This paper seeks to determine the effect deterioration has on the seismic vulnerability of a 3 span integral concrete bridge. Traditionally it has been common to neglect the effects of deterioration when assessing the seismic vulnerability of bridges. However, since a lot of the bridges currently being assessed for retrofit are approaching the end of their design life, deterioration is often significant. Furthermore, since deterioration affects the main force resisting components of a bridge, it is reasonable to assume that it might affect its performance during an earthquake. For this paper, chloride induced corrosion of the reinforcing steel in the columns and in the deck has been considered. Corrosion is represented by a loss of steel cross section and strength. A 3 dimensional non-linear finite element model is created using the finite element platform Opensees. A full probabilistic analysis is conducted to develop time-dependent fragility curves. These fragility curves give the probability of reaching or exceeding a defined damage limit state, for a given ground motion intensity measure taken as Peak Ground Acceleration (PGA). This analysis accounts for variation in ground motion, material and corrosion parameters when assessing its overall seismic performance as well as the performance of its most critical components. The results of the study show that all components experience an increase in fragility with age, but that the columns are the most sensitive component to aging and dominate the system fragility for this bridge type.
366
Authors: Tian Bo Peng, Lei Han, Xian Fei Shi
Abstract: Based on a collision analysis between the fixed middle girder and the 2-span continuous girder in longitudinal direction, motion equations of the girder and the pier are established by mode decomposition method. Displacements’ relationship at the collision interface is used to establish the equation about the collision force, and Duhamel integrals in the equation are eliminated so as to get a 6 order homogeneous ordinary differential equation about the collision force. Then an approach to solve the equation is put forward. The analysis results show that the time history curve of collision force is a half sine waveform, and the initial velocity of girder towards pier top is proportional to the peak collision force but has nothing to do with the duration of collision.
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Authors: Yu Zhen Yang, Chang Sheng Ai, Kevin Lee
Abstract: In order to complete the complex operation in the dangerous environment and improve the efficiency and accuracy of industrial production. WiFi based remote control system platform is composed by the controlled mobile robot and control terminal such as PC. They communicate with each other through wireless network. The mobile robot constructs of four wheel drive. Microcontroller, sensor, wireless routing module, serial server and network camera are in the robot. Control terminal includes PC, control handle and other equipments. Using a proven and reliable wireless bridge, each network device can realize network communication with others. Based on the TCP/IP protocol, using socket programming technology, data communication can be achieved. Video capture uses the network camera. Through the test of the platform, bilateral operation with real-time haptic and video feedback are achieved. At the same time according to the real-time environmental information feedback, control terminal realizes the effective remote monitoring in the controlled end.
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Authors: Ming Li, Zi Lin Yi, Yang Wang
Abstract: This paper mechanically applies the thought of recursive hierarchical structure in analytic hierarchy process, by means of fuzzy mathematics, with the investigation, analysis, induction, the fuzzy relation matrix has been found, at the same time, the assignment weight of index is merged into that. Then the integrated condition assessment results of bridge are gained finally. This method greatly reduces the happening of ill-considering the influencing factors, make the results more real, specific and comprehensive, avoid effectively great loss which is caused by the defects of safety and service performance.
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Authors: Ki Tae Park
Abstract: The first long-term bridge monitoring system in Korea was installed in 1995, and many bridges have been maintained by long-term monitoring systems. Recently, reliability of data and cost effectiveness have been increased by advanced sensor technology (fiber optic sensor, RFID, USN etc) and measuring equipment. In Korea, the large-scale project for the safety network integration for long-term smart monitoring systems for bridge structures started in 2007, and this is the second year of the project. In this system, various innovative sensor types are considered. To increase the effectiveness of this network system, an analysis of the problems with the conventional long-term bridge monitoring system and solution investigations are needed. The biggest problems are low durability and data reliability because of noise, and the lack of data applications techniques. Therefore, in this paper, a brief summary of the projects is presented and the state of bridge monitoring systems in Korea is investigated, and various problems and solutions for these problems are briefly suggested.
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Authors: Hai Feng Lv, Jun Fan Zhao
Abstract: Structural monitoring systems using MEMS sensor and labview software have the potential to serve as low-cost alternatives to commercially available cable-based monitoring systems. This paper describes a sensing prototype system specifically designed for bridge monitoring applications. To validate the performance of the prototype system, a micro heat convective accelerometer is installed on the model bridge. A labview program is designed for converting, storing and processing the bridge vibration signal which acquired from the data acquire card. Prior to the validation experiment, a calibration test is carried out and the sensitivity is measured to be 650mV/g. The acceleration response of the bridge is recorded by the designed monitoring systems.
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