斜拉桥锚固段环向预应力钢绞线伸长量误差分析

Error Analysis of Elongation on the Annular Prestressing Steel Strands of Anchorage Zone of Cable-stayed Bridges

通过广州大桥索塔锚固段环向预应力钢绞线伸长量试验,发现后张法"U"形预应力钢绞线的实际伸长量大于理论限值,同时国内类似试验研究资料也表明对于后张法"U"形预应力钢绞线来说是一种普遍现象。文中分析了产生此类问题的原因,并提出了相应的建议,可供工程实践参考。

Through the research on the elongation test of the annular Prestressing steel Strands by the Anchorage Zone of Guangzhou Bridge,it can be Found that the elongation of the tensioned U-shaped prestressing steel strands is greater than the actual theoretical limit,and the domestic trial research datas also showed that it is a common phenomenon to the tensioned U-shaped prestressing steel strands.This paper analyzes the reasons for such problems.Some Relative suggestions are proposed,they can be used in engineering practice.