输电线路圆形截面基础偏心受拉配筋计算方法  

Calculation Method of Reinforcement for Circular Section Foundation in Transmission Line Under Eccentric Tension

作　　者：李林 高见 韩大刚 王伸富 刘琴 LI Lin;GAO Jian;HAN Da-gang;WANG Shen-fu;LIU Qin(Southwest Electric Power Design Institute Co.,Ltd.of CPECC,Chengdu 610056,China)

机构地区：[1]中国电力工程顾问集团西南电力设计院有限公司,四川成都610056

出　　处：《电力勘测设计》2021年第5期30-33,66,共5页Electric Power Survey & Design

摘　　要：圆形截面基础在输电线路中应用广泛,在风荷载和角度力的作用下,基础的受力状态常常表现为偏心受压和偏心受拉,纵向普通钢筋截面面积往往由偏心受拉控制。GB 50010—2010《混凝土结构设计规范》附录E.0.5给出了圆形截面偏心受拉构件的正截面受拉承载力计算方程组,该方程组为超越方程,不能直接求得钢筋截面面积。本文对该方程组进行整理,假定最小配筋面积为初始面积,通过牛顿法迭代求解得到钢筋截面面积,并且证明了该计算方法的收敛性和解的唯一性。工程算例表明,该计算方法收敛速度快、结果准确,目前已在西南电力设计院有限公司自主开发的单桩批量快速计算软件中得到应用。The circular section foundation is widely used in transmission lines.Under the action of wind load and angular force,the basic stress state often shows eccentric compression and eccentric tension.The longitudinal common steel section area is often controlled by eccentric tension.The appendix E.0.5 of the Code for Design of Concrete Structures(GB 50010—2010)gives the calculation equations for the tensile bearing capacity of the circular section eccentric tension members.The equations are transcendental equations,and cannot directly calculate the section area of reinforcing bars.In this paper,the equations are arranged,and the minimum reinforcement area is assumed to be the initial area.The cross-sectional area of the reinforcement is obtained by Newton method and the convergence of the calculation method and the uniqueness of the solution are proved.The engineering example shows that the calculation method has fast convergence speed and accurate results.It has been applied in the single pile batch rapid calculation software independently developed by Southwest Electric Power Design Institute Co.,Ltd.

关 键 词：圆形截面 偏心受拉 钢筋面积 迭代法 

分 类 号：TM726[电气工程—电力系统及自动化]