基于MIDAS应变与挠度校验系数的对比分析

Comparative Analysis of Strain and Deflection Calibration Coefficient Based on MIDAS

为了研究应变校验系数和挠度校验系数的精确性,以连续箱梁为研究对象建立了MIDAS-CIVIL模型,在相同加载状况下分别计算得出均匀截面和突变截面两种情况下测试截面的应变和挠度值,并将两种情况下的数值进行对比分析,结果发现在前后两种情形下应变值没有发生变化,而挠度值变化较大。表明挠度校验系数更为精确,其结论可为梁桥荷载试验中应变校验系数与挠度校验系数不协调而需做出取舍时提供理论依据。

In order to study the accuracy of the strain calibration coefficient and deflection calibration coefficient,a continuous box girder was taken as the research object,and a MIDAS-CIVIAL model was established. It calculated separately under the same load condition and obtained the strain and deflection value of the test section in both cases of uniform cross-section and variable cross-section. Then the values under two situations were compared and analyzed. The results showed that the strain value in two situations had not changed,while the deflection value changes was larger. All that indicated that the deflection calibration coefficient was more accurate than strain calibration coefficient,and the conclusion could provide a theoretical ba- sis for making a choice when the strain calibration coefficient and deflection calibration coefficient were not coordinated in bridge load test.