组合荷载下输电线路榫卯—法兰混凝土装配式基础承载性能研究  

Study on Bearing Capacity of Mortise-tenon and Joint-Flange Concrete Assembled Foundation of Transmission Line under Combined Load

作　　者：王彦海[1] 邹梦健 任文强 WANG Yanhai;ZOU Mengjian;REN Wenqiang(College of Electrical and New Energy,China Three Gorges University,Yichang 443000,China)

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443000

出　　处：《电工材料》2024年第3期76-83,共8页Electrical Engineering Materials

基　　金：国家自然科学基金资助项目(52079070)。

摘　　要：榫卯-法兰装配式基础作为新型板式混凝土装配式基础具有适用性较强的优点,但目前缺乏对其承载性能的研究。为探究该类型基础在组合荷载(上拔-水平荷载)下区别传统现浇基础的受力特点和承载性能,通过有限元软件建立基于实际地质环境的榫卯-法兰装配式基础抗拔承载模型和同规格现浇基础抗拔模型,仿真计算基础的应力分布、竖向和水平位移、上拔和水平承载力。结果表明:榫卯-法兰装配式基础的底座变形远低于主柱变形,基础底座的承载能力并未得到充分发挥;其上拔工作性状与现浇基础不存在实质性差异,荷载-位移关系曲线表现为典型的上拔形态,可大致分为直线缓慢上升、塑性加速上升和直线破坏三个阶段;基础的上拔累计位移13 mm左右、水平累计位移10 mm左右时,基础进入极限状态,且极限承载力优于同规格现浇基础,而达到极限状态时的位移与现浇基础相差不大;基础抗拔过程中呈现出“分段传递”的受力特点,在混凝土上柱屈服后,榫卯-法兰连接节点将接收上柱传递的荷载,并在节点位移达到极限后才会继续向基础下柱传递荷载。Mortise-tenon-flange assembly foundation has excellent application as a new type of slab concrete assembly foundation,but there is a lack of research on its bearing capacity.In order to explore the mechanical characteristics and bearing capacity of this type of foundation under combined load(uplifthorizontal load),which is different from the traditional cast-in-place foundation,the uplift bearing model of mortise and tenon-flange assembled foundation and the uplift model of cast-in-place foundation with the same specification were established based on the actual geological environment by finite element software.The stress distribution,vertical and horizontal displacement,uplift and horizontal bearing capacity of the foundation were simulated and calculated.The results show that the deformation of the base of the mortise and tenon-flange assembled foundation is much lower than that of the main column,and the bearing capacity of the foundation base has not been fully utilized.There is no substantial difference between the uplift behavior and the cast-in-place foundation.The load-displacement relationship curve shows a typical uplift shape,which can be roughly divided into three stages:linear slow rise stage,plastic accelerated rise stage and linear failure stage.When the uplift cumulative displacement of the foundation reaches about 13 mm and the horizontal cumulative displacement reaches about 10 mm,the foundation enters the limit state,and the ultimate bearing capacity is better than that of the cast-in-place foundation of the same specification,and the displacement at the limit state is not much different from that of the cast-in-place foundation.The foundation shows the stress characteristics of segmented transmission during the pull-out process.After the concrete upper column yields,the mortise-tenon-flange connection node will receive the load transmitted by the upper column,and will continue to transmit the load to the lower column of the foundation after the displacement of the node reaches the limit.

关 键 词：输电线路 榫卯-法兰装配式基础 组合荷载 极限承载力 

分 类 号：TM753[电气工程—电力系统及自动化]