ICOCEE – CAPPADOCIA 2017 Nevsehir, TURKEY, May 8 - 10, 2017
Effect of Pier Scour on Bridge Multi Hazard Performance O. Ozcan1 and O. Ozcan2* 1
Eurasia Institute of Earth Sciences, Istanbul Technical University, TURKEY. (E-mail:
[email protected]) 2*
Civil Engineering, Akdeniz University, Antalya, TURKEY. (E-mail:
[email protected])
ABSTRACT The numerous complexities associated with bridge pier scour have caused scour to be one of the most active topics of stream geomorphic research. The assessment of local scouring mechanism around bridge piers provides information for decision-making regarding the pile footing design. Besides, predicting the safety of bridges under critical scoured conditions may help prevent unnecessary loses. In the case study conducted in Boğaçayı Bridge in Antalya Province, bridge design plans and HEC-RAS modeling were used for the assessment of changes in stream geomorphic conditions. The derived fluvial scour depths were compared with the results of field measurements and the empirical formula that is based on stream flow discharge rate, streambed condition and shape of river. The river basin was modeled and the amount of fluvial scour in bridge piers was measured by unmanned aerial vehicle (UAV) based surveying methods, which offer solutions with high precision and reliability, while providing a new and practical approach. By using the UAV-derived dense point clouds and very high-resolution orthophotos acquired at periodic intervals of the river basin, the flood induced scour in the bridge piers were determined. Further, in the light of this information, the seismic performance of reinforced concrete (RC) bridge infrastructure was determined via static pushover methods. In the study region, the scour depths were determined to reach maximum of 2.2 meters after previous flood events. The scourinduced reduction in pile lateral displacement capacities was detected to deteriorate the seismic performance of the bridge. Keywords: Bridge piers, Multi hazard, Scouring, UAV, Risk analysis
