碳绞线体外预应力梁的基频分析  

Basic Frequency Analysis of Concrete Beam with External Prestressing by CFCC

作　　者：刘杰[1] 

机构地区：[1]东南大学交通学院,南京210096

出　　处：《特种结构》2009年第2期64-68,共5页Special Structures

基　　金：江苏省交通科学研究计划项目(No:03Y028)

摘　　要：通过理论公式推导、有限元软件(ANSYS)分析以及试验研究等方法,对体外预应力碳绞线对简支梁基频的影响进行了分析。理论公式推导中,利用由分布质量梁模型得到的自由振动方程,对Ayaho Miyamoto等人给出的公式进行了修正和扩充,考虑了预应力筋在锚固点既有水平位移又有竖直位移的影响;推导出各种线型布置下梁的自振频率计算公式。分析结果表明,体外预应力简支梁与普通钢筋混凝土简支梁的基频没有显著区别,近似计算方法具有实用性。Vibration models with external prestressed CFRP tendons were analyzed with theoretical calculation,finite-element software （ ANSYS ） and experiment in order to study the external prestressed CFRP tendons＇ influence to the dynamic performance. Based on the free vibration equation of beam with distributed mass, the formula presented by Ayaho Miyamoto etc. is improved by taking horizontal and vertical displacement of anchorage into account. Some for- mulae for frequency calculation are given when external tendons are arranged in different configurations. The results reveal that external prestressed tendons have no significant effect on the beam＇ s basic frequency. At the same time, the formulae＇s practicability is verified by the results.

关 键 词：体外预应力梁 自由振动方程 基频 CFRP筋 碳绞线 

分 类 号：TU378.2[建筑科学—结构工程]