高、超高强度混凝土后安装机械紧固件

Michael Schwenn, Klaus Voit, Oliver Zeman, Konrad Bergmeister
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引用次数: 10

摘要

后装紧固系统在当今的结构工程中是必不可少的。随着高强混凝土(HSC)和超高性能混凝土(UHPC)的日益普及,这些地下室的紧固应用越来越频繁。这不可避免地导致了传统紧固系统和相应设计概念在混凝土抗压强度高达200 N/mm2时的适用性问题。根据EAD 330232-00-0601,机械紧固件必须放置在不含纤维的压实钢筋或非钢筋混凝土的预钻孔中,强度等级在C20/25至C50/60之间,符合EN 206。这意味着混凝土强度等级C50/60也为更高的混凝土强度提供了参考;还排除了纤维对混凝土延性的影响以及纤维对混凝土延性的影响。在本贡献的框架内,旨在分析以下方面:(a)通过实验调查证明各种紧固系统在未增强和纤维增强高强度混凝土中的适用性;(b)就当前有效的欧洲评估文件发表声明,并为该问题提供实验背景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Post-installed mechanical fasteners in high strength and ultra-high strength performance concrete

Post-installed fastening systems are essential in structural engineering nowadays. Triggered by the increasing popularity of high strength concrete (HSC) and ultra-high performance concrete (UHPC), fastening in these basements is more and more frequently applied. This inevitably leads to the question of the applicability of conventional fastening systems and the corresponding design concepts with concrete showing a compressive strength of up to 200 N/mm2. According to EAD 330232-00-0601, mechanical fasteners have to be placed in predrilled holes in compacted reinforced or unreinforced concrete without fibers with strength classes in the range of C20/25 to C50/60 in compliance with EN 206. This means that concrete strength class C50/60 also provides the reference for higher concrete strength; the impact of fibers and accompanying increase of concrete ductility is also excluded. Within the framework of this contribution it is intended to analyze the following aspects: (a) proof of applicability of various fastening systems in unreinforced and fiber-reinforced high strength concrete via experimental investigations and (b) making a statement regarding the currently valid European Assessment Document and provide experimental background for this issue.

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