超高装配式混凝土塔筒预应力索张拉方法研究

Study on the Prestressed Cable Tensioning Method of Super-High Prefabricated Concrete Wind Tower

陆上风电超高装配式混凝土塔筒采用中空基础,与后张预应力梁式混凝土结构的受力特点不同,针对此特点提出一种分阶段同步对称张拉的施工方法,同时利用有限元分析软件对不同张拉方案进行数值模拟,通过比较各张拉阶段中索力的变动情况和结构的应力响应,对比塔筒结构最大拉应力值及其应力分布的均匀性,对各方案进行综合评价和筛选,确定较合理的张拉方法以指导现场施工,以促进这一种新型的风电基础及类似结构的推广应用。

The hollow foundation is applied to the super-height prefabricated concrete tower of onshore wind power,whose stress characteristics are different from post-tensioned prestressed concrete beam structure.In this paper,a tensioning method of two symmetrical cable by stressed synchronously is proposed.At the same time,the finite element analysis software is used to simulate the different tension schemes by comparing the change of cable force and the stress response of the structure in each tension stage,and compare the maximum tensile stress value of the tower structure and the uniformity of the stress distribution.Comprehensive evaluation has carried out on each scheme to determine the a more reasonable tensioning method to guide the site construction,so as to promote the widespread application of this new type of foundation on wind power and other similar structures in future.