| 贾彬*,陶俊林,王汝恒,杨帆.混凝土高温动态力学特性与本构方程[J].实验力学,2013,28(6):723~731 |
| 混凝土高温动态力学特性与本构方程 |
| On the Dynamic Mechanical Properties and Dynamic Constitutive Equation of Concrete at High Temperature |
| 投稿时间：2012-11-01 修订日期：2013-04-02 |
| DOI：10.7520/1001-4888-12-152 |
| 中文关键词: 混凝土 高温 动态本构关系 损伤模型 |
| 英文关键词:concrete high temperature dynamic constitutive relation damage model |
| 基金项目:国家自然科学基金(10972187),西南科技大学基金项目(11zx7158) |
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| 中文摘要: |
| 混凝土材料是多相复合材料,高温动荷载作用下其力学行为非常复杂。为此,对混凝土在爆炸、火灾等高温环境中力学特性的研究,有利于减小混凝土结构在爆炸及火灾事故中的损失。文中首先利用分离式霍普金森压杆试验装置(SHPB)设计出一套混凝土高温试验方案,然后基于15组试验工况对混凝土在温度为16℃至650℃范围内,加载撞击速度分别为5m/s、7m/s和12m/s时进行了SHPB试验,获得了与之对应的应力应变曲线。试验结果表明,混凝土应变率增强效应与高温弱化效应相互耦合,致使混凝土受温度的影响显著大于其应变率。最后,由试验结果以经典损伤理论模型为基础,根据混凝土高温动态力学特性,构建了一个统一的方程来描述混凝土高温动态应力应变关系的全过程,并且该本构方程计算结果与试验数据吻合良好。 |
| 英文摘要: |
| As a multiphase composite material, concrete presents very complicated mechanical properties under high temperature dynamic loading. In order to reduce the loss of reinforced concrete structure in fire or explosion accident, the study of its dynamic mechanical properties in high temperature environment was carried out. Firstly, an experimental scheme of concrete at high temperature was designed based on split Hopkinson pressure bar (SHPB). Then, SHPB experiments for 15 sets of concrete specimens under different experimental conditions were carried out, including temperature ranging 16℃ to 650℃, impact loading rates at 5m/s, 7m/s, and 12m/s, respectively. Stress-strain curves of concrete specimens are obtained. Based on experimental results, it can be found, that the weakening effect of temperature on concrete is significantly greater than that of strain rate due to the coupling of strain rate enhancing effect and high-temperature weakening effect. At last, according to the dynamic mechanical properties of concrete at high temperature, a constitutive model is proposed based on classical damage model, which can describe whole process of dynamic stress-strain relation of concrete at high-temperature. Calculation results from the proposed constitutive model are in good agreement with experimental data. |
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