渡槽结构在爆炸冲击荷载作用下的动力响应  

Dynamic Response of Aqueduct Structure Under Blast Impact Load

作　　者：李涛峰[1] 张多新[2] LI Taofeng;ZHANG Duoxin(Yellow River Conservancy Technical Institute,Kaifeng 475004,China;North China University of Water Resources and Electric Power,Zhengzhou 450045,China)

机构地区：[1]黄河水利职业技术学院,河南开封475004 [2]华北水利水电大学,河南郑州450045

出　　处：《人民黄河》2022年第7期115-118,124,共5页Yellow River

基　　金：黄河水利职业技术学院青年骨干教师培养计划项目(2019HYGG11)。

摘　　要：针对渡槽结构在爆炸冲击荷载作用下的动力响应问题,以南水北调中线某渡槽为例,采用M法模拟桩周土体对桩的作用,采用基于Housner理论的弹簧质量模型模拟槽身与水体的相互作用,并利用三维有限元建立了渡槽结构在爆炸冲击荷载下的分析模型。利用时程分析法分别计算了渡槽结构在空槽、半槽水深、设计水深3种工况下,遭受爆炸冲击荷载时所产生的位移和应力。结果表明:槽身的最大位移响应和最大应力响应均大于槽墩的,槽身中部的最大拉应力响应大于槽身两端的,侧墙顶端和底板中部拉应力响应相对较大,而槽墩上部的最大位移响应和最大应力响应又大于槽墩下部的;在空槽时,槽身内最大拉应力和最大位移响应最大,此时对结构最为不利。Aiming at the issue of the dynamic response for aqueduct structure under blast impact load,taking the aqueduct in a city of the Middle Route of South-to-North Water Transfer Project as an example,the M method was used to simulate the effect of soil around piles on piles.The interaction between aqueduct body and water was simulated by the spring mass model which was based on Housner theory.Finally,the analysis model for aqueduct structure under blast impact load was established by using 3 D FEM.The displacement and stress of aqueduct structure subjected to explosion impact load under the three conditions of no water in the aqueduct,half water depth and design water depth were calculated by time history analysis method.The calculation results under this three working conditions show that the maximum displacement response and the maximum stress response of the aqueduct body are greater than those of the pier,the maximum tensile stress response in the middle of the aqueduct body is greater than that at both ends of the aqueduct body,the tensile stress at the top of the side wall and the middle part of the floor is larger and the maximum displacement response of the top part of the pier is greater than those of the bottom part;when there is no water in the aqueduct,the maximum tensile stress response and the maximum displacement response of the aqueduct are the largest,which is the most unfavorable to the structure.

关 键 词：三维有限元 渡槽结构 爆炸冲击荷载 时程分析法 动力响应 

分 类 号：TV312[水利工程—水工结构工程]