摘要
针对高耸进水塔塔后回填高度的选取问题,规范未给出通用的取值范围,在计算分析时一般只考虑塔后回填对塔体应力的影响,对塔后回填与基岩交接处的应力涉及较少。在保证进水塔稳定的条件下,采用ANSYS有限元分析理论,建立进水塔三维有限元模型,选用反应谱法计算了进水塔在地震作用下的动力响应,对比分析了不同塔后回填高度对进水塔结构自振频率、位移、塔体应力、回填与基岩交接处应力的影响程度。结果表明:塔后回填高度在一定范围内时,塔后回填能够有效提高塔体的自振频率,改善塔体的位移及应力,塔后回填混凝土与基岩交界面处的应力值有小幅度的增大;当塔后回填高度超过一定值时,回填高度的增加对塔体的自振频率、位移、应力的改善逐渐减弱,塔后回填混凝土与基岩交界面处的应力出现突增。综合分析得出此类进水塔合理的回填高度约为0.64倍塔高。
The standard does not give a general range the selection of backfill height of high intake tower,the influence of backfill on the stress of tower body is generally considered;however,the stress at the junction of backfill and basement is less involved.In this study,the three-dimensional finite element model of the stable intake tower was established using the ANSYS finite element analysis theory,and the dynamic response of the intake tower under earthquake was calculated using response spectrum method.The natural frequency,displacement,tower stress,and the degree of influence of joint stress at backfill intersection with bedrock were compared and analyzed.The results showed that the backfilling behind the tower can effectively increase the natural frequency of the tower in certain range,and improve the displacement and stress of the tower.The stress value at the interface between backfilling concrete and bedrock increased slightly.When the backfilling height behind the tower exceeded a certain value,the improvement effect of increase of backfilling height on the natural frequencies,displacements and stresses gradually weakened.The stress at the interface between Backfill Concrete and bedrock behind the tower increased sharply.All in all,the reasonable backfill height of this kind of intake tower is about 0.64 times of the tower height.
作者
杨光
李守义
李浪
肖阳
张紫璇
杨勇
YANG Guang;LI Shouyi;LI Lang;XIAO Yang;ZHANG Zixuan;YANG Yong(Faculty of Water Conservancy and Hydropower,Xi′an University of Technology,Xi′an 710048,China)
出处
《水资源与水工程学报》
CSCD
2019年第6期180-185,共6页
Journal of Water Resources and Water Engineering
基金
国家自然科学基金项目(51579208)
陕西省自然科学基础研究计划项目(2019JQ-577)
关键词
高耸进水塔
回填高度
应力
位移
自振频率
抗震性能
high intake tower
backfill height
stress
displacement
natural frequency of the tower
seismic performance
