小浪底灌溉塔非线性动力安全研究

对灌溉塔的动力安全性进行了研究。计算时,灌溉塔与挡墙间的施工缝采用接触单元进行模拟,动力非线性计算采用时程分析法,加速度的假定采用Newmark方法,计算平台为ANSYS。计算结果表明:塔顶动力变形满足20 cm宽的塔间缝设计要求,事故闸门槽的变形不会影响闸门的开启,塔体拉应力主要分布在塔基面和232 m,245 m高程塔体截面变化处,接触面混凝土不会被压坏,塔体的抗滑和抗倾覆稳定满足要求。

Nonlinear dynamic safety study for irrigation tower of Xiaolangdi Project

The dynamic safety study was performed by ANSYS software and the acceleration distribution was assumed based on the Newmark method.In this study,the contact element was used for simulation of the construction joints between the irrigation tower and the retaining wall,and the timehistory analysis method was employed for nonlinear computation.Some conclusions are drawn: the dynamic deformation at the top of the irrigation tower meets the design requirement of 20?cm for gaps between towers;the deformation of emergency gate slot does not influence the opening of the emergency gate;the tensile stresses mainly distribute in the bearing surface and the sections at the elevation of 232?m and 245?m,where the shape of the tower body varies;the compressive stresses are less than the strength of concrete at contact faces,therefore,the concrete contact faces will not be damaged;the anti-slide and anti-overturning stability of the tower body meets the design requirement.