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浙江大学学报(工学版)
浙江大学学报(工学版)  2024, Vol. 58 Issue (6): 1153-1160    DOI: 10.3785/j.issn.1008-973X.2024.06.006
土木工程、交通工程     
输电铁塔装配式基础抗剪键连接的剪切性能
吕庆1(),胡嘉飞1,麻坚2,华献宏3,徐刚2
1. 浙江大学 建筑工程学院，浙江 杭州 310058
2. 金华电力设计院有限公司，浙江 金华 321000
3. 国网浙江省电力有限公司金华供电公司，浙江 金华 321000
Shear performance of shear connectors for prefabricated foundation of transmission tower
Qing Lü1(),Jiafei HU1,Jian MA2,Xianhong HUA3,Gang XU2
1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
2. Jinhua Electric Power Design Institute Co. Ltd, Jinhua 321000, China
3. Jinhua Power Supply Company of State Grid Zhejiang Electric Power Co. Ltd, Jinhua 321000, China
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摘要：

预制构件连接方法及其界面剪切性能影响整个输电铁塔装配式基础的受力和变形. 针对螺栓连接易松动、变形大之类的问题，提出采用高强灌浆料灌注成形的十字形抗剪键作为输电铁塔装配式基础连接方案. 采用室内剪切试验和数值模拟，研究该抗剪键连接的剪切性能，并与常用的螺栓连接进行对比分析. 结果表明：十字形抗剪键剪切破坏模式为剪断型脆性破坏，破坏形态表现为以抗剪键为中心向外略有扩展成菱形. 和螺栓连接相比，抗剪键连接的剪切强度略低，但剪切刚度显著提高. 浇筑过程中灌浆料外溢对界面抗剪强度有提高作用. 抗剪键的抗剪性能与灌浆料强度正相关，但提高灌浆料强度对抗剪性能提升并不明显. 抗剪键深度对抗剪性能有影响，但在抗剪键深度超过20 mm后，抗剪键的抗剪性能不再提高. 根据剪切试验和数值模拟结果，建议十字形抗剪键设计为长200 mm、宽20 mm、深20 mm.
关键词： 输电铁塔;  装配式基础;  十字形抗剪键;  剪切性能;  剪切试验    
Abstract:

Connection of prefabricated components and their interface shear performance affect stress and deformation characteristics of assembled foundation of entire transmission tower. In response to issues such as easy loosening and large deformation of bolt connector, a cross shaped shear connector by pouring high-strength grouting material as a connection scheme was proposed for the assembled foundation of transmission towers. The shear performance of the shear connector was investigated using shear testing and numerical simulations, and compared with commonly used bolt connector. Results show that the shear failure mode of the shear connector was shear brittle failure. The destructive form was manifested as a slight expansion outward from the center of the shear connector into a diamond shape. Compared with the bolt connector, the shear strength of shear connector was slightly lower, but the shear stiffness was significantly improved. The overflow of grouting material during the pouring process improved the shear strength of the interface. The shear performance of the shear connector was positively correlated with the strength of the grouting material, but increasing the strength of the grouting material did not significantly improve the shear performance. The depth of the shear connector had an impact on the shear performance, but when the depth of the shear key exceeded 20 mm, the shear performance of the shear connector no longer improved. According to the results of shear testing and numerical simulations, the design of a cross shaped shear connector with a length of 200 mm, a width of 20 mm, and a depth of 20 mm was suggested.
Key words: transmission tower    prefabricated foundation    cross shaped shear connector    shear performance    shear test
收稿日期: 2023-05-16 出版日期: 2024-05-25
CLC:  TU 47  
基金资助: 国网浙江公司依托工程基建新技术研究资助项目(SGTYHT-21-JS-225).
作者简介: 吕庆（1978—），男，教授，博导，从事工程和地质灾害防治研究. orcid.org/0000-0003-0466-2936. E-mail：lvqing@zju.edu.cn
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引用本文:

吕庆,胡嘉飞,麻坚,华献宏,徐刚. 输电铁塔装配式基础抗剪键连接的剪切性能[J]. 浙江大学学报(工学版), 2024, 58(6): 1153-1160.

Qing Lü,Jiafei HU,Jian MA,Xianhong HUA,Gang XU. Shear performance of shear connectors for prefabricated foundation of transmission tower. Journal of ZheJiang University (Engineering Science), 2024, 58(6): 1153-1160.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2024.06.006    或    https://www.zjujournals.com/eng/CN/Y2024/V58/I6/1153

图 1  输电铁塔装配式基础示意图
图 2  剪切试件示意图
图 3  剪切加载装置示意图
图 4  剪切试验布置图
图 5  抗剪键连接界面荷载-相对位移曲线
试件编号Fz/kNFu/kNSu/mmFc/kN
J-12003760.48216
J-21503150.46174
J-31002180.35133
表 1  抗剪键连接试验结果
图 6  抗剪键连接界面破坏形态
图 7  螺栓连接界面荷载-相对位移曲线
试件编号Fz/kNFu/kNSu/mmFc/kN
M-120045332.5217
M-215034422.8128
M-310031423.8120
表 2  螺栓连接试验结果
图 8  螺栓连接界面破坏形态
图 9  螺栓破坏形态
图 10  灌浆料范围网格分析图
参数数值
$ {k_{{\text{nn}}}} $/（N·mm?3）1358
$ {k_{{\text{tt}}}} $,$ {k_{{\text{ss}}}} $/（N·mm?3）20358
$ t_{\text{n}}^0 $,$ t_{\text{s}}^0 $,$ t_{\text{t}}^0 $/MPa5.01
φ/mm0.117
f1.09
表 3  试件与抗剪键连接界面参数
图 11  抗剪键有限元模型
试件编号$ {F_{\text{u}}} $/kN$ {F_{{\text{uu}}}} $/kNFu/Fuu$ {S_{\text{u}}} $/mm$ {S_{{\text{uu}}}} $/mmSu/Suu
J-13763480.930.480.370.77
J-23153140.990.460.370.80
J-32182751.260.350.371.06
表 4  数值模拟和室内剪切试验结果对比
图 12  抗剪键破坏时等效塑性应变分布图
图 13  J-1试件荷载-位移曲线对比
试件编号Fz/kNFu/kNFu*/kNα/%
J-120034824429.9
J-215031421033.1
J-310027517536.4
表 5  灌浆料外溢对界面抗剪强度的影响
图 14  灌浆料强度对抗剪键峰值荷载的影响
图 15  抗剪键深度对抗剪键峰值荷载的影响
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