全轻纤维混凝土的SHPB试验研究

发布时间：2018-06-17 20:27

本文选题：全轻纤维混凝土 + SHPB　；参考：《河南理工大学》2016年硕士论文

【摘要】：全轻混凝土(ALWC)是一种具有质轻、高强、抗震、耐火等优良特性的新型建筑材料。尤其是在掺入不同种类的纤维后,能有效改善全轻混凝土的静力学性能和动力学性能;因而可广泛应用于节能建筑、抗冲击等特种结构。本文在课题组前期关于静态力学性能研究基础上,通过SHPB冲击试验,对复合纤维的全轻页岩陶粒混凝土的冲击性能进行了研究,以探讨其耗能效应。具体研究内容和结论如下:(1)通过对全轻纤维混凝土的相关静力学试验,发现了表征纤维增强效应的指数;而基于耗能角度对应力-应变曲线的分析发现,各种纤维均能提高峰值特征量,并能使下降段变得更平缓、更长;(2)随着SHPB试验中的子弹冲击速率增大,混凝土的峰值应力和破坏应变也相应增大,其碎块越来越多,且碎块逐渐变小;同时发现,纤维增强增韧和耗能效应与纤维指标有关,并随纤维指标增长呈非线性增长;(3)综合所有试验结果分析发现,ALWFRC的峰值应变、破坏应变、耗能分别和应变率效应和纤维指标都具有非线性关系;(4)在综合考虑纤维的增强效应、应变率效应和纤维指标影响,对HJC动态本构模型进行了修正。
[Abstract]:ALWC) is a new type of building material with good properties such as light weight, high strength, earthquake resistance, fire resistance and so on. Especially, the static and dynamic properties of lightweight concrete can be effectively improved by adding different kinds of fibers, so it can be widely used in energy-saving buildings, shock resistance and other special structures. Based on the previous study on static mechanical properties of composite fiber based on the SHPB impact test, this paper studied the impact property of composite fiber full light shale ceramsite concrete, in order to discuss its energy dissipation effect. The specific research contents and conclusions are as follows: (1) the index of fiber reinforcement effect is found through the relevant static test of light fiber reinforced concrete, and the stress-strain curve is analyzed based on energy consumption angle. All kinds of fibers can increase the peak characteristic quantity, and can make the descending section more gentle, and longer.) with the increase of bullet impact rate in SHPB test, the peak stress and failure strain of concrete also increase, and more pieces of concrete are broken. At the same time, it was found that the fiber reinforced toughening and energy dissipation effects were related to the fiber index, and showed a nonlinear increase with the fiber index growth. (3) synthesizing all the experimental results, it was found that the peak strain and the failure strain of ALWFRC were found. The dynamic constitutive model of HJC is modified by considering the fiber reinforcement effect, strain rate effect and fiber index effect.
【学位授予单位】：河南理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU528.572

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