Calculation Methods of Ultimate Tensile Strength for Screw Anchors
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摘要: 自攻锚栓是一类具有装卸方便快速、施工可调性好、临界边界距离短等优点的混凝土后锚固机械锚栓,近年来得到了越来越多的工程应用. 为保证自攻锚栓承载力符合要求及所锚固结构的安全性,需对其受拉时不同破坏模式对应的极限抗拉承载力进行严格的计算和设计. 目前国内外对自攻锚栓承载力方面的相关研究均较少,对其受拉破坏机理的研究更是缺乏,使设计者仅通过厂家提供个别设计值对锚栓承载力进行估算和设计,不能准确计算理论承载力值. 为了促进对自攻锚栓受拉拔破坏机理及其极限抗拉承载力计算的进一步研究,本文系统地总结了自攻锚栓在受外部静拉力荷载作用下锚栓拉断破坏、混凝土锥体破坏与组合破坏模式的形成机理,指出锚栓极限抗拉承载力及破坏模式与锚固深度的对应关系;详细介绍并分析了针对自攻锚栓各破坏模式的极限抗拉承载力预测模型;重点讨论了有关组合破坏模式极限抗拉承载力预测模型的研究现状,并展望了对其进一步验证及改进的必要性;最后描述了现有锚栓群组、间距、边距效应的计算方法,指出了对自攻锚栓在该领域研究的需求.Abstract: Screw anchors are a type of post-installed concrete anchors with the advantages of convenient and fast installation and removal, good construction adjustability, and short critical margin distance. Therefore, it has been used more in the field in recent years. To ensure that the requirements of bearing capacity of screw anchors and the safety of the anchored structure, the ultimate tensile strength corresponding to different tensile failure modes should be strictly calculated and designed. However, the research on the bearing capacity of screw anchors is relatively scarce, and that on its tensile failure mechanism is even less. Thus, the designers estimate and design the bearing capacity of screw anchors according to the individual design values provided by manufacturers, and cannot accurately calculate the theoretical ultimate strength. To further understand the tensile failure mechanism and calculation methods for the ultimate tensile strength of screw anchors, the formation mechanisms of the anchor bolt failure, concrete cone failure and combined failure mode for screw anchors under external static tensions are systematically summarized, and the relationship between the failure modes with the ultimate tensile strength and embedment depth is presented. The prediction model of the ultimate tensile strength corresponding to different failure modes is introduced and analyzed in detail. The state of the art on the prediction model of the ultimate tensile strength for the combined failure mode is discussed, and the prospect of further verification and improvement are explored. The current calculation methods of anchor group, spacing, and edge effects are presented, and it is also pointed out that there is a need for studying screw anchors in this regard.
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Key words:
- anchor /
- concrete /
- screw anchor /
- failure mode /
- ultimate tensile strength
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CHEN Z. Analyzing the failure mechanisms and developing strength prediction models for concrete expansion and screw anchors in tension[D]. Pullman: Washington State University, 2018. 陈俊,蒋恩浩,刘艳芝,等. 全螺纹高强锚栓锚固性能试验研究[J]. 土木与环境工程学报,2019,41(3): 58-66. doi: 10.11835/j.issn.2096-6717.2019.050CHEN Jun, JIANG Enhao, LIU Yanzhi, et al. Experimental investigation on bonding anchorage performance of full-thread high strength anchor bolt[J]. Journal of Civil and Environmental Engineering, 2019, 41(3): 58-66. doi: 10.11835/j.issn.2096-6717.2019.050 ELIGEHAUSEN R, MALLÉE R, SILVA J F. Anchorage in concrete construction[M]. Berlin: Ernst und Sohn, 2006 CHEN Z, NASSIRI S, LAMANNA A. Investigation of a combined failure mode for screw anchors under tension[J]. Advances in Structural Engineering, 2020, 23(13): 2803-2812. doi: 10.1177/1369433220924795 OLSEN J, PREGARTNER T, LAMANNA A J. Basis for design of screw anchors in concrete[J]. ACI Structural Journal, 2012, 109(4): 559-567. CHEN Z, NASSIRI S, LAMANNA A, et al. Investigation of pull-through and pullout failure modes of torque-controlled expansion anchors[J]. ACI Structural Journal, 2020, 117(1): 17-27. 钟传国,欧曙光,潘智杰. 普通型膨胀锚栓抗拔力与混凝土强度关系研究[J]. 广东建材,2015,31(2): 38-40. doi: 10.3969/j.issn.1009-4806.2015.02.016 American Concrete Institute Committee 318. Building code requirements for structural concreteand commentary: ACI318-19[S]. Armington Hills: American Concrete Insititute, 2019. 中华人民共和国住房和城乡建设部. 混凝土结构加固设计规范: GB 50367—2013[S]. 北京: 中国建筑工业出版社, 2013 中华人民共和国住房和城乡建设部. 混凝土结构后锚固技术规程: JGJ 145—2013[S]. 北京: 中国建筑工业出版社, 2013 中华人民共和国住房和城乡建设部. 混凝土用机械锚栓: JG/T 160—2017[S]. 北京: 中国标准出版社, 2017 FUCHS W, ELIGEHAUSEN R, BREEN J E. Concrete capacity design (CCD) approach for fastening to concrete[J]. ACI Structural Journal, 1995, 92(1): 73-94. EOTA. Guideline for European technical approval of metal anchors for use in concrete: ETAG 001[S]. Brussels: European Organization for Technical Approvals, 1997. KUENZLEN J H. Load-bearing behavior of screw anchors under axial tension[D]. Stuttgart: University of Stuttgart, 2004. MOHYEDDIN A, GAD E, ARIA S, et al. Effect of thread profile on tensile performance of screw anchors in non-cracked concrete[J]. Construction and Building Materials, 2020, 237: 117565.1-117565.12. MOHYEDDIN A, GAD E, LEE J. Failure modes and tensile strength of screw anchors in non-cracked concrete[J]. Construction and Building Materials, 2019, 221: 501-513. doi: 10.1016/j.conbuildmat.2019.06.096 NASSIRI S, CHEN Z, LAMANNA A, et al. Numerical simulation of failure mechanism in screw anchors under static tension[J]. Advances in Structural Engineering, 2020, 23(16): 3385-3400. doi: 10.1177/1369433220937143 期刊类型引用(4)
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