日照温差下明钢管变位特性分析

发布时间：2018-11-09 08:55

【摘要】：为了探究日照温差下明钢管变位特性,基于某水电站典型管段明钢管,运用ANSYS软件,建立三维有限元模型,研究了检修时在日照两侧温差下明钢管的偏移及受力,进一步分析了在此偏移不能恢复时充水运行后的管段位移、受力情况。结果表明:在不均匀温差引起的管段变形的基础上充水运行,管段更显著地向低温侧偏移,管段弯曲加剧,运行水头越高则管段受不均匀温差影响越大;限位挡板缝隙越大,则支座、限位挡板受力越小,但是限位挡板对管段的约束作用越弱;管段变位以及支座、限位挡板受力较大的部位均出现在靠近伸缩节的支墩处,可以考虑在此处缩小支墩间距以加强管段约束、缓解结构受力;为防止不均匀温差下管段从支座上脱落,有必要适当增大限位挡板尺寸。
[Abstract]:In order to investigate the displacement characteristics of bright steel pipe under sunshine temperature difference, based on the typical pipe section of a hydropower station, a three-dimensional finite element model was established by using ANSYS software to study the displacement and force of the bright steel pipe under the temperature difference between the two sides of the sunshine. Furthermore, the displacement and stress of the pipe after the water filling can not be recovered are analyzed. The results show that when the pipe is filled with water on the basis of the deformation caused by non-uniform temperature difference, the pipe section deviates more significantly to the low temperature side, the bend of the pipe section is aggravated, and the higher the running water head, the greater the influence of the non-uniform temperature difference on the pipe segment. The larger the gap of the limiting baffle, the smaller the force on the support and the limiting baffle, but the weaker the constraint of the limiting baffle on the pipe segment; The displacement of pipe segment and the support, the position of the limiting baffle are all located near the abutment of telescopic joint, so it can be considered to reduce the distance between the piers to strengthen the constraint of the pipe segment and to ease the stress of the structure. In order to prevent the pipe section from falling off the bearing, it is necessary to increase the size of the limiting baffle.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;
【基金】：国家自然科学基金项目(51409194)
【分类号】：TV732.41

【相似文献】