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原文传递 Impact of Aspect Ratio on Two-Column Bent Seismic Performance.

题名：	Impact of Aspect Ratio on Two-Column Bent Seismic Performance.
作者：	mostafa, k. sanders, d. saiidi, m. s.
关键词：	impact, beam tests, hinges, joints(junctions), concrete structures, static loads, loads(forces), earthquakes, design criteria, performance evaluation
摘要：	The design of structural bridge elements like columns, beam-column joints, and cap beams has evolved in the past 20 years. Many experimental tests have been done in order to determine the behavior of bridge columns under seismic loading. Most of those tests were static performed with monotonic cyclic loading. Only a few of those tests were dynamically performed on shake tables to simulate the actual earthquakes. Based on the literature review, few studies were concerned about testing the seismic behavior of newly designed models; in particular, two-column bent models with hinged bases. Therefore, the objective of the present study was to test two-column bridge bents dynamically by subjecting them to actual time earthquakes. Three models with columns aspect ratios of 6.64, 4.5 and 2.5 and scale ratio of 0.3 were designed according to the updated Caltrans design criteria. The aspect ratio is the height of the column divided by the column diameter. The shake table was able to exert the record of the Sylmar earthquake, 1984, on the three specimens with various amplitudes. All deformations, rebar strains and mass accelerations were recorded during shaking. The three specimens behaved strongly and resisted high levels of the Sylmar earthquakes after experiencing high ductility levels. The two long specimens had a similar flexural behavior, whereas the short specimen had a hybrid between flexural and shear behavior. / Supplementary Notes: Sponsored by the California State Dept. of Transportation, Sacramento, and the National Science Foundation, Washington, DC. / Availability Note: Also available on CD-ROM. Product reproduced from digital image. Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA.
总页数：	u0715；594p
报告类型：	科技报告