大型渡槽的动力响应分析  

Analysis on Dynamic Response in the Large Aqueduct

作　　者：张建华[1] 

机构地区：[1]华北水利水电学院,河南郑州450011

出　　处：《人民黄河》2012年第12期136-137,共2页Yellow River

摘　　要：针对大型渡槽的动力响应问题,以南水北调工程沙河渡槽为例,应用有限元软件建立三维计算模型,采用附加质量法考虑动水压力,用Newmark方法对结构进行了全时域下的横向应力和纵向应力计算,并对其在横向激励(地震)下的动力响应进行了分析。结果表明:渡槽结构的动应力均随槽内水深的增加而增大;在横向地震激励作用下,槽底纵横梁对横向应力影响较大,容易在纵横梁交界处引起应力集中;在横向激励下,渡槽结构横向位移的响应规律是跨中大、两端小。Aiming at the large-scale aqueduct＇s dynamic response question, the finite element software was adopted to establishment three dimen- sional computation model for Shahe aqueduct, which is one of the South-North Water Transfer engineering. Dynamic water pressure was considered by the associated mass method, lateral stress and longitudinal stress were calculated via Newmark method in entirely time domain, and dynamic re- sponsc was analyzed in the lateral stimulation （Earthquake）. The results show that dynamic stresses increase along with the water depth multiplica- tion. The effect of vertical and horizontal beams of bottom on crossrange stress is larger, which causes the stress concentration on the adjacent of ver- tical and horizontal beam; depend on lateral stimulation the totality displacement law of aqueduct structural response are lateral displacement of midspan is large, and both ends are small.

关 键 词：动应力 动位移 横向激励 沙河渡槽 南水北调工程 

分 类 号：TV672[水利工程—水利水电工程]