不同管道特性对PCCP动力响应的影响分析

Analysis of effect of different pipeline characteristics on PCCP dynamic response

以南水北调中线工程中河南省南阳段的PCCP为研究对象,建立了有限元动力分析模型,对其动力特性与地震动力响应进行了分析研究。分析了不同管道特性对PCCP动力响应的影响:不同的埋设深度、不同的管壁厚度等。结果表明,当埋深大于某一限值以后,结构的动应力与管道埋深关系不大;管道的最大轴向应力会随着管道壁厚的增加而减小,而最大弯曲应力变化很小。

The PCCP in Nanyang section, Henan province, in the middle route of South-to-North Water Transfer Project, was taken as the research object. The finite element dynamic analysis model was established, and the dynamic characteristics and seismic response were analyzed. The influence of different pipe characteristics on dynamic re- sponse of PCCP was analyzed, such as different buried depth, pipe wall thickness and concrete strength. Results show that,when the buried depth is greater than a certain threshold, the dynamic stress of the structure is almost un- changed;The maximum axial stress decreases with the increase of pipe wall thickness,but the maximum bending stress change a little.