Rate effect on the mechanical properties of eight types of high-strength concrete and comparison with FIB MC2010
Rate effect on the mechanical properties of eight types of high-strength concrete and comparison with FIB MC2010
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DOI：
10.1016/j.conbuildmat.2011.11.037
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发表时间：
2012-05
影响因子：
7.4
通讯作者：
Xiaoxin Zhang;G. Ruiz;R. Yu;E. Poveda;R. Porras
中科院分区：
文献类型：
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作者：
Xiaoxin Zhang;G. Ruiz;R. Yu;E. Poveda;R. Porras
本文报道了八种性能设计高强混凝土力学性能率敏感性的试验结果。特别地，使用液压伺服控制的试验机在2.1×10−7s− 1至2.1×10−4s−1的应变速率下进行压缩试验。实验结果表明，随着应变速率的增加，抗压强度和弹性模量均增加。此外，给出了各种混凝土的抗压强度、弹性模量与应变率之间的经验关系式。与FIB Model Code 2010（MC 2010）的经验公式相比，该公式的预测结果与实验结果吻合较好，应变率经验公式的下限可以从原来提出的10−5s − 1扩展到10−7s − 1的数量级。但对于准静态力学性能的预测，相对误差可达90%以上，不适用于实际应用。
This paper reports recent experimental results on the rate sensitivity of mechanical properties for eight types of performance-designed high-strength concrete. In particular, compressive tests were conducted using a hydraulic servo-controlled testing machine at strain rates from 2.1×10−7s−1to 2.1×10−4s−1. The experimental results show that the compressive strength and the elastic modulus increase with an increase in the strain rate. Moreover, the empirical formulas showing the variation between the compressive strength, the elastic modulus and the strain rate for each type of concrete are presented, respectively. Compared with the empirical formulas of the FIB Model Code 2010 (MC2010), it is clear that the predictions from the Code are in a good agreement with the experimental results, and the lowest limit of the empirical formulas for strain rate can be extended to 10−7s−1instead of originally proposed 10−5s−1in the order of magnitude. However, for predicting quasi-static mechanical properties, the Code is not appropriate since the relative error would reach 90%.