Experimental Study of the Dynamic Flexural Strength of Concrete

被引：17

作者：

Regal, X. ^{[1
]}

Hanus, J-L. ^{[1
]}

机构：

[1] INSA Ctr Val Loire, Lab PRISME, 88 Blvd Lahitolle, F-18020 Bourges, France

来源：

EXPERIMENTAL MECHANICS | 2017年 / 57卷 / 03期

关键词：

Concrete; Strain rate effect; Dynamic increase factor; Digital image correlation; Flexural strength; Split hopkinson pressure bar; HIGH LOADING RATES; TENSILE-STRENGTH; FRACTURE ENERGY; NUMERICAL-ANALYSIS; BEHAVIOR; IDENTIFICATION; TOUGHNESS; FAILURE;

D O I：

10.1007/s11340-016-0243-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper, we analyze the increase in the dynamic flexural strength of concrete according to strain rate. A simple beam with center-point loading and a classical electro-mechanical testing machine are used to determine the static flexural strength. The dynamic measurements are conducted using a split Hopkinson pressure bar (SHPB) device in the same three-point bending configuration. The outer faces of the beams are instrumented with strain gauges to record the extreme tensile strains. Moreover, full-field displacement measurements are obtained using digital image correlation (DIC) on images recorded by a very high-speed camera. The strain gauge and DIC measurements are compared and used to determine the onset of failure and to evaluate the rate-related tensile strength. Several tests are performed at strain rates in the range from 1/s to 15/s. As expected, a significant increase in the flexural tensile strength with strain-rate is observed, which is consistent with results from the literature.

引用

页码：427 / 442

页数：16

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