矮塔斜拉桥结构校验系数通常值研究

Study on Ordinary Value of Structural Verification Coefficient of Extradosed Cable⁃stayed Bridge Load Test

国内相关检定规范未给出矮塔斜拉桥结构校验系数通常值分布区间,通常参考其他类型桥梁的结构校验系数对实桥试验数据进行评价。结构类型差异、计算模型偏差、桥梁结构病害等均会对结构校验系数的分布产生一定的影响。本文以23座矮塔斜拉桥实桥试验数据为样本,采用统计方法对采用预应力混凝土主梁的矮塔斜拉桥实桥试验结构校验系数进行研究,得到矮塔斜拉桥主梁跨中应变校验系数通常值为0.566~0.959,挠度校验系数通常值为0.627~0.935,并结合实桥试验予以验证。当校验系数超出统计通常值时桥梁可能存在病害。

The ordinary distribution range of structural verification coefficient of extradosed cable-stayed bridge is not given in relevant domestic verification specifications.The real bridge test data are usually evaluated with reference to the structural verification coefficient of other types of bridges.Structural type difference,calculation model deviation and bridge structural disease will have a certain impact on the distribution of structural verification coefficient.Taking the test data of 23 extradosed cable-stayed bridges as samples,this paper studies the test structure verification coefficient of extradosed cable-stayed bridges with prestressed concrete main girders by using statistical methods.It is proposed that the mid-span strain verification coefficient of extradosed cable-stayed bridges is usually 0.566~0.959 and the deflection verification coefficient is usually 0.627~0.935,which is verified by real bridge tests.When the verification coefficient exceeds the ordinary value by statistics,the bridge may have defects.