Investigation of ultra-high performance concrete slabs under contact explosions with a calibrated K&C model
Investigation of ultra-high performance concrete slabs under contact explosions with a calibrated K&C model
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使用校准 K 研究接触爆炸下的超高性能混凝土板
DOI：
10.1016/j.engstruct.2022.113958
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发表时间：
2022-03
影响因子：
5.5
通讯作者：
Chengqing Wu
中科院分区：
文献类型：
--
作者：
Jian Liu;Jun Li;Jianguang Fang;Kai Liu;Yu Su;Chengqing Wu
K&C （Karagozian and Case）混凝土模型被广泛用于超高性能混凝土（UHPC）构件在冲击、爆炸等冲击荷载作用下的数值模拟。本研究对UHPC的K&C混凝土模型进行了三个强度面、状态方程、剪切剪胀、损伤演化和应变率效应的校正，为确定这类新型混凝土的关键模型参数提供了简单而通用的指导。利用标定后的混凝土模型，通过与单轴压缩、直拉和三轴压缩静力试验结果对比，采用单单元法验证模型的准确性。结合应变率效应对UHPC板接触爆炸试验进行了数值模拟，与试验结果相比，数值结果对破坏模式、爆坑和结痂损伤有较好的预测效果。更重要的是，本文提出的数值模型和模拟方法在静态和动态试验数据不足的情况下，对于接触爆炸作用下的UHPC材料结构构件具有普遍的适用性。利用经校正和验证的K&C混凝土模型，进行参数化研究，推导出预测接触爆炸作用下UHPC板局部损伤模式的新经验方程。
Karagozian and Case (K&C) concrete model is extensively adopted in the numerical simulations of ultra-high performance concrete (UHPC) structural members subjected to impulsive loads such as impact and blast. In this study, a calibration of the K&C concrete model was conducted for UHPC in terms of three strength surfaces, equation of state, shear dilatancy, damage evolution and strain rate effect to offer simple and general guidelines on the determination of key model parameters for this new class of concrete. With the calibrated concrete model, a single element method was adopted to verify its accuracy through a comparison to the results from the static tests of the uniaxial compression, direct tension and triaxial compression. Furthermore, the numerical simulations of contact explosion tests on the UHPC slabs with the incorporation of the strain rate effect were performed and the numerical results exhibited good predictions regarding the failure mode, crater and scabbing damage as compared to the test results. More importantly, this proposed numerical model and simulation methodology are reasonable to be generally used for structural members constructed of UHPC materials under contact explosions when lacking sufficient static and dynamic test data. Using the calibrated and validated K&C concrete model, parametric studies were conducted to derive a new empirical equation for predicting the local damage mode of UHPC slabs under contact explosions.
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影响因子：
5.1
作者：
Kong Xiangzhen;Fang Qin;Li Q. M.;Wu Hao;Crawford John E.
通讯作者：
Crawford John E.
影响因子：
1.7
作者：
C. Neel
通讯作者：
C. Neel
DOI：
10.14359/14460
发表时间：
2005-06
期刊：
SP-228: 7th Intl Symposium on the Utilization of High-Strength/High-Performance Concrete
影响因子：
--
作者：
M. Schmidt;E. Fehling
通讯作者：
M. Schmidt;E. Fehling
影响因子：
1.7
作者：
K. Wille;A. Naaman;G. Parra-Montesinos
通讯作者：
K. Wille;A. Naaman;G. Parra-Montesinos
影响因子：
11.4
作者：
Ngoc-Thanh Tran;T. Tran;Dong-Joo Kim
通讯作者：
Ngoc-Thanh Tran;T. Tran;Dong-Joo Kim