Ultimate torsional moment of dry horizontal joint for prefabricated concrete tower

Junling Chen, Wenmin Lin, Jinwei Li
{"title":"Ultimate torsional moment of dry horizontal joint for prefabricated concrete tower","authors":"Junling Chen, Wenmin Lin, Jinwei Li","doi":"10.1002/tal.2156","DOIUrl":null,"url":null,"abstract":"SummaryMore and more prefabricated steel–concrete hybrid wind turbine towers have been built because of their better lateral stiffness than those of the full steel towers, in which epoxy resin joints are commonly adopted at the horizontal joint between two ring units for improving the erection speed. In fact, epoxy resin joints are designed in the same way as dry joints due to the very thin thickness of epoxy resin layer, in which epoxy resin only acts as a leveling blanket and sealer for jointing and compensates for the unevenness of the contact surface between two ring units. The current design method for the resistance to torsional moment at the horizontal joint is not reasonable because of the unreasonable assumption of Saint‐Venant's torsional theory. The integral expressions of the ultimate torsional moment at the horizontal joint with and without shear force are derived, respectively. The solution of the integral expressions for the ultimate torsional moment is realized by Python programming. The refined finite element analyses of two cases are compared with the existing small‐scale tests with segmental aluminum tubes, which verifies the calculation accuracy of the proposed integral method. In the modified integral model of the ultimate torsional moment, a correction term of the resistance to torsional moment and a more suitable distribution of shear stress under the action of horizontal shear force are proposed to obtain a more accurate ultimate torsional moment. Finally, 36 sets of cases with typical dimensions and axial forces in practical engineering are analyzed by the proposed integral model in the absence of horizontal shear force. One six‐parameter model for calculating the ultimate torsional moment is fitted by the least square method. A discount factor is proposed to consider the influence of the horizontal shear force on the ultimate torsional moment.","PeriodicalId":501238,"journal":{"name":"The Structural Design of Tall and Special Buildings","volume":"43 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The Structural Design of Tall and Special Buildings","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1002/tal.2156","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

Abstract

SummaryMore and more prefabricated steel–concrete hybrid wind turbine towers have been built because of their better lateral stiffness than those of the full steel towers, in which epoxy resin joints are commonly adopted at the horizontal joint between two ring units for improving the erection speed. In fact, epoxy resin joints are designed in the same way as dry joints due to the very thin thickness of epoxy resin layer, in which epoxy resin only acts as a leveling blanket and sealer for jointing and compensates for the unevenness of the contact surface between two ring units. The current design method for the resistance to torsional moment at the horizontal joint is not reasonable because of the unreasonable assumption of Saint‐Venant's torsional theory. The integral expressions of the ultimate torsional moment at the horizontal joint with and without shear force are derived, respectively. The solution of the integral expressions for the ultimate torsional moment is realized by Python programming. The refined finite element analyses of two cases are compared with the existing small‐scale tests with segmental aluminum tubes, which verifies the calculation accuracy of the proposed integral method. In the modified integral model of the ultimate torsional moment, a correction term of the resistance to torsional moment and a more suitable distribution of shear stress under the action of horizontal shear force are proposed to obtain a more accurate ultimate torsional moment. Finally, 36 sets of cases with typical dimensions and axial forces in practical engineering are analyzed by the proposed integral model in the absence of horizontal shear force. One six‐parameter model for calculating the ultimate torsional moment is fitted by the least square method. A discount factor is proposed to consider the influence of the horizontal shear force on the ultimate torsional moment.
查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
预制混凝土塔筒干式水平连接的极限扭矩
摘要 越来越多的预制钢-混凝土混合型风力发电机塔架已经建成,因为其横向刚度优于全钢塔架,其中两个环形单元之间的水平接缝通常采用环氧树脂接缝,以提高安装速度。事实上,环氧树脂接缝的设计方法与干式接缝相同,因为环氧树脂层的厚度很薄,环氧树脂只是作为接缝的流平毯和密封剂,补偿两个环形单元之间接触面的不平整。由于圣-维南扭转理论的假设不合理,目前水平连接处抗扭转力矩的设计方法并不合理。本文分别推导了有剪力和无剪力时水平连接处极限扭矩的积分表达式。通过 Python 编程实现了极限扭转力矩积分表达式的求解。将两种情况的精细有限元分析与现有的分段铝管小规模试验进行了比较,验证了所提出的积分方法的计算精度。在修改后的极限扭转力矩积分模型中,提出了抗扭转力矩修正项和更合适的水平剪力作用下的剪应力分布,以获得更精确的极限扭转力矩。最后,在没有水平剪力的情况下,利用提出的积分模型分析了 36 组实际工程中具有典型尺寸和轴力的案例。采用最小二乘法拟合了一个用于计算极限扭转力矩的六参数模型。考虑到水平剪力对极限扭矩的影响,提出了一个折减系数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
自引率
0.00%
发文量
0
期刊最新文献
Analysis of seismic damage and seismic capacity of the structure of the ultrahigh pagoda Enhancing Concrete Performance with Waste Foundry Sand Using Ternary Blended Mixes of Ordinary Portland Cement, Silica Fume, and Ground Granulated Blast Furnace Slag An improved Chinese load code method for the evaluation of wind‐induced base shear force on base‐isolated buildings Prediction of wind pressures on supertall buildings based on proper orthogonal decomposition and machine learning The fiber hinge model for unbonded post‐tensioned beam‐column connections
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1