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Experimental Verification of the Influence to Time-Dependent Material Properties on Long-Term Bridge Characteristics.
| 题名： | Experimental Verification of the Influence to Time-Dependent Material Properties on Long-Term Bridge Characteristics. |
| 作者： | lewis, m. karbhari, v. m. |
| 关键词： | post tensioning, girders, reinforcing steels, creep, shrinkage, concrete structures, prestressing, strain gages, verification, california, research program, long range(time), deformnation, environmental effects |
| 摘要： | Post-tensioned cast-in-place box girder bridges are commonly used in California. Losses in tension in the steel prestressing tendons used in these bridges occur over time due to creep and shrinkage of concrete and relaxation to the tendons. The use of existing methods in bridge specifications used to predict these long-term losses often result in inaccurate estimate of losses leading to severe serviceability problems. The current research program aims at developing a more precise method for predicting the long-term prestress loss in concrete bridges. Two spans in a recently constructed post-tensioned concrete bridge were instrumented with vibrating wire strain gages to monitor the long-term deformations and determine prestress loss. The recorded measurements of prestress loss were compared with the available equations from several bridge specifications as well as with analytical models developed for long-term deformations of concrete structures. To ensure accuracy in the values of the input material parameters, creep and shrinkage of concrete were simultaneously determined experimentally. This research has shown that shrinkage is highly dependent on environmental influences. / Supplementary Notes: Sponsored by California State Dept. of Transportation, Sacramento. and Federal Highway Administration, Sacramento, CA. California Div. / Availability Note: 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： | u0818；502p |
| 报告类型： | 科技报告 |
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