预应力对混凝土梁动力特性的影响分析

通过对预应力混凝土梁强迫振动试验与有限元动力分析,得出了预应力混凝土梁的基本动力特性;进一步考察了预应力大小、预应力筋形状和位置对动力特性的影响。结果表明:对于混凝土梁,是否施加预应力和预应力索的位置对频率会产生一定的影响,而预应力大小和预应力索的形状对频率的影响则较小,分析结果有助于结构健康监测和损伤识别。

ANALYSIS OF INFLUENCE OF PRESTRESSING ON DYNAMIC CHARACTERISTICS OF A CONCRETE BEAM

Based on forced-vibration testing and finite element dynamic analysis,the basic dynamic characteristics of a prestressed concrete beam are obtained.Furthermore,the changes of its dynamic characteristics with different prestressing,different prestressing cable shapes and different positions of prestressing cables are also examined.It is demonstrated that the existence or not of prestressing,and the locations of prestressing cables have certain effects on the natural frequencies of the beam,but effects of prestressing values and shapes of prestressing cables on its natural frequencies can be neglected.This analysis is helpful to structural health monitoring and damage detections.