风机基础开孔板连接件剪切受力机理试验研究

吕伟荣; 朱峰; 卢倍嵘; 石卫华; 张家志; 何潇锟; 卿胜青

doi:10.6052/j.issn.1000-4750.2017.03.0207

风机基础开孔板连接件剪切受力机理试验研究

1.
湖南科技大学土木工程学院, 湖南, 湘潭 411201;
2.
湘电风能有限公司, 湖南, 湘潭 411102

基金项目: 湖南省自然科学基金委员会与湘潭市政府自然科学联合基金项目（14JJ5012）；国家自然科学基金面上项目（51578235，51678234）.

详细信息

作者简介:
吕伟荣(1974-),男,江西人,副教授,博士,主要从事组合结构、高层结构及配筋砌体结构研究(E-mail:Lwrxm@126.com);卢倍嵘(1975-),男,湖南人,讲师,博士,从事组合结构研究(E-mail:270412853@qq.com);石卫华(1978-),男,湖南人,讲师,博士,从事钢结构研究(E-mail:26493494@qq.com);张家志(1983-),男,湖北人,工程师,学士,从事组合结构研究(E-mail:363420976@qq.com);何潇锟(1993-),男,湖南人,硕士生,从事组合结构研究(E-mail:603065537@qq.com);卿胜青(1993-),男,湖南人,硕士生,从事组合结构研究(E-mail:570308701@qq.com).

通讯作者:
朱峰(1991-),男,湖南人,工程师,硕士,从事组合结构研究(E-mail:792463292@qq.com).

中图分类号: TU476+.9
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出版历程
- 收稿日期: 2017-03-15
- 修回日期: 2017-07-23
- 刊出日期: 2018-07-24

EXPERIMENTAL STUDY ON SHEAR MECHANISM OF PERFOBOND CONNECTORS IN WIND TURBINES FOUNDATION

1.
1 Department of Civil Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China;
2.
XEMC Windpower Co., Ltd., Xiangtan, Hunan 411102, China

摘要

摘要: 鉴于目前国内出现了多台问题风机基础中穿孔钢筋疲劳脆断的工程事故，该文基于风机基础常采用的开孔板连接件构造，考虑多孔受力影响，共进行了4组12个开孔板连接件的推出试验以确定其抗剪承载力，并为其极端和运行工况设计提供依据。试验结果表明，穿筋试件的破坏过程大致分为3个阶段：①钢板与混凝土界面间摩擦受力阶段；②混凝土榫孔剪切受力阶段；③穿孔钢筋塑性剪断及其变形上方混凝土压溃。应变测试结果表明，由于穿孔钢筋的加入，上排孔的剪切受力使得下排穿孔钢筋弯曲受力明显，试件抗剪承载力较未穿筋试件得到显著提高；破坏阶段中，钢筋弯曲受力状态转变为孔内受剪，随着其上方混凝土的压溃，钢筋因受剪屈服退出工作；随着竖向裂缝的开展，全穿筋试件中3根钢筋均屈服，强度和塑性均得到有效的发挥，建议工程对中排、下排设置穿孔钢筋或三孔全设置。基于试验结果，针对不同构造的多孔推出试件破坏形态建立了多孔穿筋推出试件的抗剪承载力统一计算公式，计算结果表明计算值与试验值吻合较好，且偏于保守，可应用于实际工程。
- 风机基础 /
- 开孔板连接件 /
- 穿孔钢筋 /
- 推出试验 /
- 抗剪承载力
Abstract: Because fatigue fracture of steel bars had occurred in perfobond connectors of wind turbines foundation, 4 different groups, totally 12 push-out tests were carried out to provide evidence for the design of wind turbines foundation under extreme and running condition. Test specimens were designed to have many perfobond connectors along the direction of shear load considering the structure of wind turbines foundation and pre-existing push-out test of PBL shear connector. Test results show that the failure process of push-out test includes three stages, the interface friction between concrete and steel plate, the concrete tenon holes of perfobond connector resisting shear load, and the steel bar of perfobond connector yielding and its upper concrete crushing. Compared with the case of no steel bar perfobond connector, the strain results of steel bar and plate show that the bending stress on bottom steel bar is more obviously because of the shear stress on upper steel bar, and the shear capacity of specimen is significantly improved. During the failure stage, the stress state of steel bar changes from bending to shear, and the steel bar yields with the crush of its upper concrete. Because 3 steel bars all yields gradually with the growing of vertical cracks, the strength and plasticity of specimen is fully developed. 3 steel bars or 2 steel bars locating at the second and third perfobond connector is suggested in the design of wind turbines foundation. Based on this test results, the shear strength formula of perfobond connector in wind turbines foundation was put forward. Compared with tests results, the calculated value tends to be a little conservative, and can be used for the design of wind turbines foundation.
- wind turbine foundation /
- perfobond connector /
- perforated rebar /
- push-out test /
- shear capacity

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参考文献(37)

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风机基础开孔板连接件剪切受力机理试验研究

通讯作者: 朱峰(1991-),男,湖南人,工程师,硕士,从事组合结构研究(E-mail:792463292@qq.com).

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EXPERIMENTAL STUDY ON SHEAR MECHANISM OF PERFOBOND CONNECTORS IN WIND TURBINES FOUNDATION

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出版历程

目录

通讯作者:
朱峰(1991-),男,湖南人,工程师,硕士,从事组合结构研究(E-mail:792463292@qq.com).