摘要
目前水工结构的动力破坏特性越来越受到关注。通过模型试验的方法研究重力坝模型在冲击荷载作用下的破坏。冲击荷载施加的位置在模型顶部,冲击荷载由小到大逐渐增加,直到模型破坏。结构的响应由布置在模型上的加速度传感器和应变传感器测定。对应于每次冲击荷载,试验时分别记录加速度和应变响应值。根据结构在冲击荷载下响应的时程曲线,可得结构在不同冲击荷载作用下最大加速度和最大应变响应值。试验结果表明在结构破坏之前,结构各部位的加速度响应与应变响应的最大值基本上随冲击荷载的增加而增加。当结构发生破坏时,结构的最大响应值不论是加速度响应还是应变响应都有所减小,并且此时的响应规律也与通常情况下的响应规律不同。
The damage behavior of hydraulic structure caused by dynamic load attracts more attention at present.In this work,the damaging of a gravity dam under impact load is studied by model test.The impact load was applied on the top part of a model dam,and it was gradually increased until the model structure is damaged.The dynamic responses of the structure were measured by the acceleration and strain transducers,and during the test the time histories of acceleration and strain were recorded for every impact load.By using the amplitudes of time histories,the maximum structure responses of acceleration and strain under different loads were obtained.The results show that the maximum responses at all the sampling locations increase with the intensity of impact load.When the structure enters the damaging stage,the amplitudes of acceleration and strain responses show a decrease,and the behavior of dynamic responses becomes different from that at the previous stage.
出处
《水力发电学报》
EI
CSCD
北大核心
2010年第5期11-13,34,共4页
Journal of Hydroelectric Engineering
基金
国家重点基础研究发展973计划(2007CB714104)
关键词
水工结构
破坏
模型试验
重力坝
冲击荷载
hydraulic structure
damage
model test
gravity dam
impact load
