Seismic performance of an existing bridge with scoured caisson foundation
This paper presents in-situ seismic performance tests of a bridge before its demolition due to accumulated scouring problem. The tests were conducted on three single columns and one caisson-type foundation. The three single columns were 1.8 m in diameter, reinforced by 30-D32 longitudinal reinforcements and laterally hooped by D16 reinforcements with spacing of 20 cm. The column height is 9.54 m, 10.59 m and 10.37 m for Column P2, P3, and P4, respectively. Column P2 had no exposed foundation and was subjected to pseudo-dynamic tests with peak ground acceleration of 0.32 g first, followed by one cyclic loading test. Column P3 was the benchmark specimen with exposed length of 1.2 m on its foundation. The exposed length for Column P4 was excavated to 4 m, approximately 1/3 of the foundation length, to study the effect of the scouring problem to the column performance. Both Column P3 and Column P4 were subjected to cyclic loading tests. Based on the test results, due to the large dimension of the caisson foundation and the well graded gravel soil type that provided large lateral resistance, the seismic performance among the three columns had only minor differences. Lateral push tests were also conducted on the caisson foundation at Column P5. The caisson was 12 m long and had circular cross-sections whose diameters were 5 m in the upper portion and 4 m in the lower portion. An analytical model to simulate the test results was developed in the OpenSees platform. The analytical model comprised nonlinear flexural elements as well as nonlinear soil springs. The analytical results closely followed the experimental test results. A parametric study to predict the behavior of the bridge column with different ground motions and different levels of scouring on the foundation are also discussed.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/16713664
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Supplemental Notes:
- Copyright © 2014, Institute of Engineering Mechanics, China Earthquake Administration and Springer-Verlag Berlin Heidelberg.
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Authors:
- Chang, Kuo-Chun
- Sung, Yu-Chi
- Liu, Kuang-Yen
- Wang, Ping-Hsiung
- Lee, Zheng-Kuan
- Lee, Lu-Sheng
- Witarto
- Publication Date: 2014-8
Language
- English
Media Info
- Media Type: Digital/other
- Features: Figures; Photos; References; Tables;
- Pagination: pp 151-165
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Serial:
- Earthquake Engineering and Engineering Vibration
- Volume: 13
- Issue Number: 1 Supplement
- Publisher: Springer
- ISSN: 1671-3664
- EISSN: 1993-503X
- Serial URL: http://link.springer.com/journal/11803
Subject/Index Terms
- TRT Terms: Bridge foundations; Caissons; Columns; Dynamic structural analysis; Earthquake resistant design; Performance tests; Scour; Soil structure interaction
- Geographic Terms: Taiwan
- Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; I24: Design of Bridges and Retaining Walls;
Filing Info
- Accession Number: 01541325
- Record Type: Publication
- Files: TRIS
- Created Date: Oct 21 2014 8:54AM