输水管道水锤效应作用下斜拉桥结构动力响应研究

发布时间：2019-06-11 01:05

【摘要】：为研究斜拉桥上铺设的大型输水管道发生水锤效应时桥梁结构的动力响应,以某独塔斜拉桥为工程背景,根据水锤效应的基本理论和作用方式,将管道对桥梁的动力效应简化为一随时间变化的动力荷载。通过分别建立管道水锤计算模型和桥梁动力计算模型,得到水锤效应发生时阀门位置顺桥向冲击力随时间的变化情况,再将此冲击力作为动力荷载施加到桥梁模型上。计算结果表明:水锤冲击力随时间呈周期性变化,阀门短时间关闭时将产生较大的冲击荷载;漂浮体系独塔斜拉桥各构件在水锤冲击作用下的动力响应以顺桥向方向为主,同时伴随有竖向的位移与应力。主梁上的应力变化可忽略不计,桥塔及斜拉索中应力变化分别可达0.7MPa和1.5MPa左右。单侧布置的管道还会产生偏心作用,使结构的动力响应呈现非对称性。
[Abstract]:In order to study the dynamic response of the bridge structure when the large water transmission pipeline laid on the cable-stayed bridge has the water hammer effect, taking a single tower cable-stayed bridge as the engineering background, according to the basic theory and action mode of the water hammer effect, The dynamic effect of pipeline on bridge is simplified to a dynamic load changing with time. By establishing the pipeline water hammer calculation model and the bridge dynamic calculation model respectively, the change of the valve position along the bridge with time is obtained when the water hammer effect occurs, and then the impact force is applied to the bridge model as the dynamic load. The calculation results show that the impact force of the water hammer varies periodically with time, and the valve will produce a large impact load when the valve is closed for a short time. The dynamic response of each component of floating system single tower cable-stayed bridge under the impact of water hammer is mainly along the bridge, accompanied by vertical displacement and stress. The stress variation on the main beam can be ignored, and the stress variation in the bridge tower and cable-stayed cable can reach about 0.7MPa and 1.5MPa, respectively. The unilateral pipeline also produces eccentricity, which makes the dynamic response of the structure asymmetrical.
【作者单位】：同济大学;
【分类号】：U448.27

【参考文献】