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摘要
In order to better guide the prestressed duct friction loss coefficient test of the prestressed concrete beam of high speed railway bridge, based on the comparison and analysis of two calculation formulas for friction loss coefficient test methods, namely, the strain distribution method and tension ratio method, the calculation formulas for the test error sensitivity of the two test methods were derived respectively. The influence law of steel strand parameters on test error sensitivity coefficient was studied and theoretical analysis conclusion was validated by the statistical results of a large number of measured data. Research shows that tension ratio method is relatively simple and convenient, and suitable for application and popularization in engineering. But its calculation accuracy is more sensitive to test error. Besides, under the condition that the angle difference between test steel strands is the same and the length of steel strands is the same too, the sensitivity of calculation accuracy to the test error of duct deviation coefficient is more sensitive than that of duct friction coefficient. The study also shows that the test error sensitivity becomes greater with smaller differences of steel strand bending angles and shorter steel strands. The length difference between steel strands has influence on test error sensitivity, but does not have regularity. To improve the test precision of the friction loss coefficient of prestressed duct by tension ratio method, it is suggested that the difference of steel strand angles should be no less than 3°and the steel strand length should be no less than 15 m in test process.
- 出版日期2015
- 单位北京大学
