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Calibration of KCC Concrete Model for UHPC against Low-Velocity Impact
International Journal of Impact Engineering ( IF 5.1 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.ijimpeng.2020.103648
Shenchun Xu , Pengtao Wu , Chengqing Wu

Abstract As an innovative material, UHPC (ultra-high performance concrete) is regarded as a promising material to improve dynamic resistant performance of civil engineering structures suffered from extreme loadings such as blast, shock and impact loading. The mechanical properties of UHPC members suffered from static/dynamic loading have been systematically investigated through many physical experiments. However, the rationality of the constitutive model utilized in numerical simulations (especially the finite element simulations) to precisely describe behaviors of UHPC has been little emphasized. The objective of this study, therefore, is to calibrate the KCC (Karagozian & Case Concrete) model to effectively predict behaviors of UHPC suffered from low-velocity impact loading. At the beginning, the properties of UHPC under triaxial compression were experimentally investigated by a series of triaxial compression tests to obtain the parameters of three strength surfaces by experimental data fitting. Meanwhile, EoS (equation of state) was derived by the combination of hydro-static compression test, “p-alpha equation” and Mie–Grueneisen equation of state. Moreover, suitable damage parameters were given by repeated trials, and the suitable model of strain-rate effect for UHPC was also suggested. The single element analysis results indicate that the calibrated KCC model can reasonably reflect the behaviors of UHPC under the uniaxial and triaxial stress state. Eventually, numerical results of low-velocity impact tests of UHPC columns and beams based on the calibrated KCC model agree very well with the tests results, which indicates the rationality of the calibrated KCC model for numerical simulations on low-velocity impact.

中文翻译:

超高性能混凝土 KCC 混凝土模型抗低速冲击的标定

摘要 作为一种创新材料,UHPC(超高性能混凝土)被认为是一种很有前途的材料,可以提高土木工程结构承受爆炸、冲击和冲击载荷等极端载荷的动态抗力性能。已经通过许多物理实验系统地研究了承受静态/动态载荷的 UHPC 构件的机械性能。然而,在数值模拟(特别是有限元模拟)中使用本构模型来精确描述 UHPC 行为的合理性很少被强调。因此,本研究的目的是校准 KCC(Karagozian & Case Concrete)模型,以有效预测 UHPC 遭受低速冲击载荷的行为。一开始,通过一系列三轴压缩试验对UHPC在三轴压缩下的性能进行了实验研究,通过实验数据拟合得到了三个强度面的参数。同时,EoS(状态方程)是通过静水压缩试验、“p-alpha 方程”和 Mie-Grueneisen 状态方程的组合推导出来的。此外,通过反复试验给出了合适的损伤参数,并提出了适合UHPC的应变率效应模型。单元分析结果表明,标定后的KCC模型能够合理反映超高性能混凝土在单轴和三轴应力状态下的行为。最终,基于标定的 KCC 模型的 UHPC 柱和梁低速冲击试验的数值结果与试验结果非常吻合,
更新日期:2020-10-01
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