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| 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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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.
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Received: 16 May 2023
Published: 25 May 2024
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| Fund: 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). |
输电铁塔装配式基础抗剪键连接的剪切性能
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
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