Structural Health Monitoring of a Curved Continuous Steel Box Girder Bridge Under Marine Environment

2015 ◽  
pp. 221-230
Author(s):  
Airong Chen ◽  
Zhen Zhang ◽  
Rujin Ma
Keyword(s):  
Structural Health Monitoring ◽  
Marine Environment ◽  
Health Monitoring ◽  
Continuous Steel ◽  
Box Girder ◽  
Structural Health ◽  
Steel Box Girder ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Steel Box Girder Bridge

Research on Surface Cracks Identification of Continuous Steel Box Girder Bridge by Wavelet Analysis of the Strain Mode

2012 ◽  
Vol 178-181 ◽  
pp. 2509-2512
Author(s):  
De Qing Guan ◽  
Hong Wei Ying ◽  
Xiao Lin Zhong
Keyword(s):  
Three Dimensional ◽  
Haar Wavelet ◽  
Continuous Steel ◽  
Surface Cracks ◽  
Box Girder ◽  
Strain Mode ◽  
Steel Box Girder ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Steel Box Girder Bridge

The paper chose a three-span continuous steel box girder bridge with horizontal semicircular surface cracks as research object, and the cracks are non-through and unsymmetrical. Solving strain modal parameters of beams with cracks by means of the three-dimensional finite element theory, and applying continuous wavelet transform (CWT) to analyze the strain mode by Haar wavelet, then the position of the cracks could be identified by the maximum of wavelet coefficients. The validity of the method has been proved by numerical calculation and analysis. Some useful conclusions for continuous steel girders bridge have been drawn and it has been useful in surface flaw identification and diagnosis in structures.

Design of a Long-Term Monitoring System for a PSC Continuous Box-Girder Bridge

2014 ◽  
Vol 619 ◽  
pp. 1-9 ◽  
Author(s):  
Chuang Chen ◽  
R. Kaloop Mosbeh ◽  
Zong Lin Wang ◽  
Qing Fei Gao ◽  
Jun Fei Zhong
Keyword(s):  
Structural Health Monitoring ◽  
Monitoring System ◽  
Health Monitoring ◽  
Continuous Monitoring ◽  
Variable Cross ◽  
Box Girder ◽  
Structural Health ◽  
Box Girder Bridge ◽  
Girder Bridge

Structural Health Monitoring is becoming an increasingly common tool to obtain the long-term performance of infrastructures and buildings. Many structural health monitoring systems were developed and applied to different bridges in the world. However, very little is known on the applications in extreme cold environment. Fu Sui Bridge, a 1070 m variable cross-section continuous box-girder bridge, is located in the coldest province -- Heilongjiang province, China. In order to monitor the static and dynamic responses of the bridge under the traffic and environmental variation, a long-term continuous monitoring system was designed and installed on Fu Sui Bridge in April 2012. A hydrostatic leveling system was used to measure the displacement and fiber Bragg grating sensors were used to measure strain, acceleration and temperature. Moreover, other necessary components including data acquisition and transmission, data calculation and analysis software are also described. Summer and winter monitoring data are also presented. This paper focuses on: (1) the design and installation of the long-term continuous monitoring system hardware and (2) the operating pattern and function of the automatic monitoring system. After more than one year successful conducting, the system has provided a large amount of data records for daily management and research of the bridge. This system can be applied to extremely cold region.

scholarly journals Research on structural dynamic characteristics of continuous steel box girder-bridge with lager ratio of wide-span

2018 ◽  
Vol 17 ◽  
pp. 03008
Author(s):  
Haijun Yin ◽  
Ziqing Li ◽  
Xianwu Hao
Keyword(s):  
Dynamic Properties ◽  
Element Model ◽  
Continuous Steel ◽  
Structural Dynamic ◽  
Box Girder ◽  
Steel Box Girder ◽  
Structural Dynamic Characteristics ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Steel Box Girder Bridge

Structure natural frequency and mode of vibration can not only reflect the structure modal parameters of dynamic properties, but also incarnate the dynamic evaluation characteristics of bridge structure. This paper applies ANSYS to establish the finite element model based on a continuous steel box girder bridge in order to obtain the corresponding modal analysis parameters. Through the environmental stimulation test, The results show that height of the steel box girder and the setting of diaphragm plate is reasonable, transverse space of piers not merely provide enough support but also ensure lateral stability of the bridge, as well as offering aside the maximum lateral clearance of the existing road. Meanwhile, the calculation results have important engineering practical values. which can provide basic data for the design, construction and maintenance of similar Bridges.

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