摘要
地震中,埋设管道通常和周围土体一起运动,而且,除了在断层、滑坡以及土性急剧变化的地段可能遭受的桐应破坏之外,沿管轴方向地震运动造成的埋管震害最为显著。本文讨论的正是沿管轴方向行进的波引起的充满流体的地下管道动力反应问题,考虑了土、管和流体的相互作用。针对某些介质和结构参数给出了一些数值结果,表明了流体、周围土体对管的反应的影响。计算出含流体和不含流体的管道随扰动频率变化的动力放大效应和系统的自振频率。最后,得出了流体、周围土体、扰动频率等因素对管体反应影响的若干初步结论。
Buried pipelines move closely with the surrounding soil and. usually, the axial strain induced by ground motion is the predominant excitation and cause of damage during earthquake(provided that they are located far away from the zones of fault, landslide, and abrupt variation of soil properties, where major damage of other type may be resulted in),In accordarce with the observed fact, an analysis of the dynamic response, of buried pipeline filled with liquid under axial excitation is made in the paper with due consideration of soil-pipe-liquid interac-ticn.Some numerical results are obtained for certain values of material and structural parameters, which shed, light on the effect of filled liquid and surrounding soil on the pipe response. Plots of the dynamic amplification factor versus frequency of excitation for the pipeline with and without filled liquid and natural frequencies of the system are shown. Finally,some conclusions stating that the influences of filled liquid and surrounding soil on the pipe response will be varied depending on the slze. stiffness ratio, inp.t wave form and EG on are made.
出处
《地震工程与工程振动》
CSCD
北大核心
1989年第1期79-90,共12页
Earthquake Engineering and Engineering Dynamics
