闸墩预应力锚索新形式的探索

本文结合大推力预应力闸墩的现状 ,提出了布置一种新型的无粘结弯曲预应力锚索的想法 ,并对其进行了研究。文章以喜河电站表孔闸墩设计参数为基本数据 ,应用大型商用结构分析软件MSC/Nastran ,对闸墩在弧门推力作用下的应力状况进行了分析 ;同时 ,根据墩体及锚块内的最大主应力迹线进行无粘结弯曲锚索的布置 ,对以闸墩颈部 (闸墩与锚块连接处 )为主的受拉区混凝土进行预压。对于这种新型的无粘结弯曲锚索 ,利用MSC/Nastran软件 ,从对混凝土的预压效果方面将其与传统的有粘结直锚索的做法进行了对比、研究。结果表明 ,无粘结弯曲锚索的效果更好一些。

Research on new style of prestressed cables for gate pier

With investigation of the application of the prestressed pier with high thrust,a new idea of research on the style of the flexural unbonded prestressed cable is presented in this paper.Based on the data of Xihe hydropower station,FEM analysis about the stress state of the arc-gate pier with high thrust has been done and achieved with the help of the structure-analyzing software MSC/Nastran.For the analysis,the flexural cables were placed along the trace of maxi principal stresses in the pier and anchor block,the concrete was prestressed in the tension area of the pier neck which is connected by the pier with the anchor block.Study of concrete prestressed effect has been made to contrast the new style cable with the traditional linear bonded prestressed cable.As the result of the contrast,the effect of the flexural unbonded prestressed cable is better.