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Use of Finite Element Modeling for Condition Assessment of reinforced Concrete Bridge Colums in Structural Health Monitoring

Zanjanizadeh, Vahid
http://rave.ohiolink.edu/etdc/view?acc_num=akron1257532604

Abstract Details

2009, Master of Science in Engineering, University of Akron, Civil Engineering.
Bridges are very important in public transportation because vast revenue resources are consumed in building bridges, and the need to maintain these structures to be continuously operational. In addition, bridges deteriorate with time like any other structure. The causes could be chemical attack, overloading, environmental effects, corrosion of steel reinforcement and quality of maintenance. Hence, they require health monitoring and structural evaluation periodically. Structural health monitoring (SHM) holds a great deal of potential to reduce the inspection and maintenance costs of existing bridges by identifying the structural deficiencies at an early stage, as well as verifying the efficacy of repair or rehabilitation procedures. Most of the SHM research focused is on the bridge deck and girders, and there appears to be no focused study on condition assessment of bridge columns despite bridge columns being more vulnerable against corrosion, and susceptible to vehicle collisions. This research consists of investigation of methodologies for full scale finite element modeling of bridges subjected to moving truck loads using a commercial package called ABAQUS/standard. Moving load induced by two standard AASHTO trucks was developed through load-time history that was applied on 35 nodes on the bridge deck. Modal analysis followed by an implicit dynamic analysis was carried out to study the dynamic behavior of bridges under moving load. The selected bridge was West bound Ronald Reagan cross country highway (SR126) bridge, HAM-126-0881, over Hamilton Avenue (Route 4) in Cincinnati, Ohio. It is a typical three-span steel-girder reinforced concrete bridge. The results of finite element analysis are validated with data collected in field SHM tests conducted on this bridge through wired sensor network by another research group. Additionally, the influence of several parameters such as variations in truck loads and the corresponding speeds, damping ratios of the bridge, and the possible variations in material properties of concrete on the dynamic response of bridges was studied using finite element modeling. Good agreement was found between the field measurement and the response predicted by the finite element simulations. Most concerned dynamic response was strains at different locations in bridge girders and columns, because it is a significant item that can be measured with confidence during structural health monitoring field tests. Particularly, the strain response of the columns due to moving loads was evaluated in this study. The study revealed that the columns have considerable influence on dynamic behavior of the bridges. Also, the range of the strains in the column was found to be very small (20 to 100-micro). This strain range may be used in sensor designs for SHM field tests. By increasing truck speed and weight, the response of the bridge in terms of strains and accelerations increased. However, the effect of the damping was quite the opposite, i.e., by increasing the damping ratio, the response of the bridge reduced. The effect was in the form of smoothing of the response curves than decreasing the global response.
Anil Patnaik, PhD (Advisor)
145 p.
Civil Engineering
Bridge; Structural health monitoring; damage; Bridge columns; Moving load; dynamic

Recommended Citations

Citations

  • Zanjanizadeh, V. (2009). Use of Finite Element Modeling for Condition Assessment of reinforced Concrete Bridge Colums in Structural Health Monitoring [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1257532604

    APA Style (7th edition)

  • Zanjanizadeh, Vahid. Use of Finite Element Modeling for Condition Assessment of reinforced Concrete Bridge Colums in Structural Health Monitoring. 2009. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1257532604.

    MLA Style (8th edition)

  • Zanjanizadeh, Vahid. "Use of Finite Element Modeling for Condition Assessment of reinforced Concrete Bridge Colums in Structural Health Monitoring." Master's thesis, University of Akron, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1257532604

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Akron and OhioLINK.