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为研究大吨位小半径环向预应力钢束的孔道摩阻系数及钢束伸长值理论计算方法,以哈尔滨四方台斜拉桥为研究对象,进行索塔锚固区节段足尺模型试验及张拉工艺试验。通过试验现象观测、数据分析及孔道局部解剖,系统地分析了影响张拉伸长量的主要因素。研究结果表明:基于最小二乘原理的多变量数据拟合技术为分束计算μ值提供了可靠依据;引入等效束型概念,避免了预应力束伸长量计算前后假定不一致的问题;综合考虑钢束内部的弹性伸长量、由束效应与小半径效应引起的附加伸长量、张拉工作段伸长量及锚具压缩引起的伸长量的计算方法,对大吨位小半径环向预应力钢束张拉伸长量超过现行规范规定的现象,能作出合理解释,对规范在直梁张拉基础上得出的伸长量计算方法是有益补充。
In order to study the tunnel friction coefficient of large-tonnage small-radius hoop prestressing steel bundle and the theoretical calculation method of the steel bundle elongation, a full-scale model test of the anchorage zone of the pylon was conducted with the cable-stayed bridge of Sifangtai in Harbin Tension process test. Through the observation of experimental phenomena, data analysis and local anatomy of the tunnel, the main factors affecting the tensile elongation were systematically analyzed. The results show that the multivariate data fitting technique based on the principle of least squares provides a reliable basis for the μ value of beam splitting. By introducing the concept of equivalent beam type, the problem of presumed inconsistency before and after prestressing beam elongation calculation is avoided. Taking into account the internal elastic elongation of the steel beam, the additional elongation caused by the beam effect and the small radius effect, the elongation of the tensioning section and the elongation caused by the compression of the anchor are calculated. To the prestressed steel beam stretch than the current provisions of the provisions of the phenomenon of a reasonable explanation can be made on the basis of the tension in the straight beam drawn on the basis of the calculation method is a useful complement.