螺栓预紧力对输电杆塔强度的影响  

Effect of bolt pre-tightening force on the strength of transmission line tower

作　　者：严波[1] 刘力宇[1] 毕承财 吴天宝[2] 刘凡[2] 曹永兴[2] 

机构地区：[1]重庆大学航空航天学院,重庆400044 [2]四川电力科学研究院,成都610071

出　　处：《重庆大学学报（自然科学版）》2016年第5期17-25,共9页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(51277186);国家电网公司科技资助项目~~

摘　　要：针对实际线路段,利用ABAQUS软件建立塔线耦合体系有限元模型,数值模拟该塔线体系在典型荷载作用下的应力和变形。根据现场倒塔情况,建立杆塔破坏局部区域三维实体模型,并与其它部分杆梁模型连接得到杆塔整体有限元模型。三维局部区域模型考虑了螺栓和连接板之间的连接细节、螺栓预紧力、螺杆和螺孔之间的间隙等。进而数值模拟研究螺栓预紧力大小对螺栓的滑移和杆塔构件应力的影响。结果表明,过小的预紧力会导致螺栓产生明显滑移,增大螺栓和杆塔构件的应力,因而螺栓预紧力不足可能是导致杆塔破坏的主要原因之一。By means of ABAQUS software,the finite element model of a section of a real transmission line was set up,and the stresses and the deformations of the line under typical cases were numerically analyzed.According to collapsing details of the tower,a three dimensional solid finite element model of the local structure,in which the details of the structural link,bolt pre-tightening force and the clearance between bolts and screw holes were considered,was established,and the model was connected with the other portion of the tower discretized by beam and truss elements to obtain the integrity of tower.Moreover,the effects of the bolt pre-tightening force on the slipping of the bolt and structural stress were numerically investigated.It is concluded that insufficient bolt pre-tightening force gives rise to obvious slipping and large structural stress.Therefore,insufficient bolt pre-tightening force is probably one of the main reasons leading to tower collapse.

关 键 词：输电杆塔 螺栓预紧力 螺栓滑移 强度 数值模拟 

分 类 号：TM75[电气工程—电力系统及自动化] O39[理学—工程力学]