基于ANSYS的预应力闸墩结构布置研究

采用大型有限元结构分析软件ANSYS对某泄洪闸预应力闸墩9种工况进行计算,了解闸室段的应力、应变分布规律,模拟预应力闸墩的预应力效果.对闸墩锚索的布置形式进行分析,评价各部位混凝土应力状态是否满足设计控制要求,并验证闸室段结构形式的合理性.证明了泄洪闸正常运用时,闸墩施加预应力可有效消除弧门推力在闸墩及锚块上产生的拉应力.但当泄洪闸、厂房永久结构缝设置一道止水时,闸墩支铰区及锚块局部仍存在大于C40混凝土抗拉标准强度的拉应力,左墩锚块部位的最大拉应力为3 172.9 kPa,闸墩支铰区最大拉应力为3 262.2 kPa;设置两道止水时,闸墩尤其是左墩内侧闸墩与底板交接线上部区域存在较大的拉应力,不能满足闸墩混凝土抗裂设计要求,为闸室分缝、结构配筋提供了依据.

Research of Structural Arrangement of Prestressed Gate Pier Based on ANSYS

The large-scale finite element analysis software ANSYS was used to calculate and analyze some sluice prestressed gate pier under nine working conditions for understanding the distribution laws of stress and strain at sluice chamber section and the prestress effect of the prestressed gate pier,and evaluating anchor cables＇ layout of the gate pier to analyze if the stress state of all parts of concrete met the design requirements. In addition,it could verify the rationality of the chamber structure form. The results show that the prestress effectively eliminates the tensile stress generated by the thrust of radial gate on the gate pier and anchor blocks when the sluice normally works; when one water-stop sets between the sluice and the permanent structure joint of the plant,the tensile stress greater than the standard tensile strength of C40 concrete still exists in the hinge region of gate pier and anchor block,and the maximum tensile stress on left anchor block is 3 172. 9 kPa,on the hinge region is 3 262. 2 kPa; when setting two water-stops,greater tensile stress exists especially on the left pier and the upper region of bottom plate joints,which can not meet anti-crack design requirements of the gate pier concretes. The research will provide the basis for the sluice chamber parting and the structural reinforcement.