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008 140127s2012 th uu|m rtt 0| a1eng d
035 _a.b12125921
099 9 _aAIT Diss. no.ST-12-01
100 0 _aNonthachart Kulprapha
245 1 0 _aStructural health monitoring of continuous prestressed concrete bridges using ambient thermal responses
260 _aPathum Thani, Thailand :
_bAsian Institute of Technology,
_c2012
300 _a110 leaves :
_bill.
490 1 _aDissertation ;
_vno. ST-12-01
500 _aA dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Structural Engineering, School of Engineering and Technology
502 _aThesis (Ph.D.) - Asian Institute of Technology, 2012
520 _aThe feasibility of structural health monitoring of multi-span prestressed concrete bridges by using their ambient thermal responses is investigated. The study is done by using a two-spanned continuous prestressed concrete bridge model constructed and designed to have mechanical and thermal characteristics similar to typical full-size bridges. The bridge is located in an open environment in order to attain a realistic ambient thermal loading condition. Sensors are installed to continuously monitor temperatures, strains, deflections, and supp01t reactions of the bridges. Five states of distributed flexural damage, slight to severe, are induced to the bridge by applying two concentrated forces. At each damage state and the initial undamaged state, thermal loads and responses of the bridge are monitored continuously for several days. The responses are compared with those predicted by a newly developed analytical model. This analytical model takes into account of nonlinear temperature distribution in bridge cross sections, presence of prestressing forces, support flexibility, and initial crookness of bridge span. An excellent agreement between model predictions and measured responses is observed at the initial undamaged state. Measured responses at each damage state are again compared with model predictions of the undamaged state. It is found that the discrepancy between them increases with increasing of damage level. A scheme to account for the induced damage is then developed for the analytical model. By using this scheme, it is possible to tune the model predictions to match with the measured responses. Through this model tuning process, approximate damage distribution pattern and damage severity along the bridge length can be identified. The study clearly demonstrates that an effective structural health monitoring system based on ambient thermal loads and responses can be successfully developed for multi-span prestressed concrete bridges.
650 0 _aBridges, Concrete
700 0 _aPennung Warnitchai,
_eChairperson
700 0 _aNoppadol Phien-Wej,
_eExamination Committee
700 0 _aPunchet Thammarak,
_eExamination Committee
700 1 _aYun, Chung-Bang,
_eExamination committee
710 2 _aAsian Institute of Technology (Partial Scholarship),
_eScholarship donor
810 2 _aAsian Institute of Technology.
_tDissertation ;
_vno. ST-12-01
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B10871
907 _a.b12125921
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_tAbstract--AIT Diss. no.ST-12-01
_vn
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