后加预应力拉索加固铁路桥梁的力学性能研究

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Abstract Abstract：Research purposes：To restraint the transverse vibration of the deficient bridges, a potential retrofit measure named after-prestressing cables retrofit method for the railway bridge is proposed in this paper. This method does not affect the normal operation of the train, so it can significantly shorten the construction period, reduce the loss of transport, and guarantee the safe operation of the railway lines. In this paper, theory for this method is explained in detail, the influences of various modeling parameters, such as the location of the cable, the initial value for prestressing and the inclination angle of the cable are numerically assessed. Based on the analytical results, some proposal values for the aforementioned parameters are provided for their application to practical problems.
Research conclusions：(1) The more layers of cable arranged, the more first-order frequency of lateral pier increased; cables should be arranged between the top of the pier and top 1/3 in the high range. (2) The force of cables should not be too large, just ensure cables have tension. (3) When the cables angle with the pier body reaches 50 degrees, the first-order frequency of pier reaches the maximum value. In order to facilitate the construction, the cables should be fixed on the ground anchorage system which side existing longer cable. (4) The cables shall be determined by features which associates to the pier in the practical engineering application. (5) The research results can be used for railway bridge piers reinforcement about transverse amplitude.
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Key words： Key words: transverse vibration railway bridge retrofit after-prestressing cable dynamic analysis

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http://tdgcxb.crec.cn/EN/ OR http://tdgcxb.crec.cn/EN/Y2015/V32/I3/31

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