预应力张拉对32 m箱梁模型动力特性的影响  

Study on the Influence of Prestressing Tension on the Dynamic Characteristics of the 32 m Span Box Girder Model

作　　者：葛继平[1] 唐志奇[1] 陈旭[1] 张旭[2] 

机构地区：[1]上海应用技术学院城市建设与安全工程学院,上海201418 [2]上海理工大学环境与建筑学院,上海200093

出　　处：《上海应用技术学院学报（自然科学版）》2013年第2期122-127,共6页Journal of Shanghai Institute of Technology: Natural Science

基　　金：铁道部科技研究开发计划项目(2010G007-J);上海市教委重点学科建设项目(J51502);上海市大学生科技创新活动项目(PE2013038)

摘　　要：基于高速铁路32 m模型箱梁的预应力张拉试验,结合理论公式的推导,对预应力混凝土箱梁动力特性的改变进行了分析和探讨。理论分析公式表明预应力会使结构竖向频率增大,而试验结果表明预应力使得箱梁模型的竖向频率减小。在预应力张拉这一弹性过程中,预应力对结构动力特性变化的影响很小,说明预应力张拉不是引起模型箱梁动力特性改变的主要因素。Based on the prestressing test of 32 m span box girder model used in the high speed railway, and combined with the deduction of the theoretical equation, the changes of the dynamic characteristics of prestressed concrete box girder were analyzed and discussed. The analysis of the theoretical equation displayed that prestress would lead to the increase in the vertical frequency of the structure of the box girder model, while, the test results showed the opposite. In the elastic process of the prestressing ten- sion, the prestress had insignificant influence on the changes of dynamic characteristics, which proved that prestressing tension was not the main factor contributing to the changing of dynamic characteristics of the box girder model.

关 键 词：简支 预应力模型箱梁 动力特性 预应力张拉 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]