An Experimental Method to Determine the Tensile Strength of Concrete at High Rates of Strain
An Experimental Method to Determine the Tensile Strength of Concrete at High Rates of Strain
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DOI：
10.1007/s11340-009-9284-z
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发表时间：
2010-09-01
影响因子：
2.4
通讯作者：
Forquin, P.
中科院分区：
文献类型：
--
作者：
Erzar, B.;Forquin, P.
本文通过层裂试验研究了混凝土的动态抗拉强度。基于大量的数值模拟，本文提出了几个进步，以改善剥落试验的处理。撞击器的设计是为了在试样中获得更均匀的拉伸应力场。在文献中提出的三种方法来推断试样的动态强度进行了讨论，以及使用应变计和激光引伸计。实验方法适用于处理数据的几个测试进行湿微混凝土在应变速率从30到150/s。动态拉伸强度随应变率的显著增加，并与文献数据进行了比较。此外，还对试件进行了尸检研究，以改进剥落试验过程中的损伤分析。
In the present work, dynamic tensile strength of concrete is experimentally investigated by means of spalling tests. Based on extensive numerical simulations, the paper presents several advances to improve the processing of spalling tests. The striker is designed to get a more uniform tensile stress field in the specimen. Three methods proposed in the literature to deduce the dynamic strength of the specimen are discussed as well as the use of strain gauges and a laser extensometer. The experimental method is applied to process data of several tests performed on wet micro-concrete at strain rates varying from 30 to 150/s. A significant increase of the dynamic tensile strength with strain-rate is observed and compared with data of the literature. In addition, post-mortem studies of specimens are carried to improve the analysis of damage during spalling tests.