高温后钢纤维自密实混凝土动、静态力学性能研究

摘要/Abstract

摘要： 为探索高温对钢纤维自密实混凝土(SFRSCC)的动、静态力学性能的影响,对常温(25 ℃)和不同温度(200、400、600、800 ℃)热处理后的SFRSCC进行动、静态力学性能试验,结合LS-DYNA软件与HJC本构模型进行数值模拟分析。结果表明:随着温度等级的提高SFRSCC的静态抗压强度先增大后减小,在200 ℃时达最大值66.9 MPa;在同等级冲击荷载作用下,随着温度等级的提高,SFRSCC的动态抗压强度先增大后减小,并在200 ℃时达到最大;SFRSCC的动态抗压强度随冲击荷载等级的增加而增大,动态强度增长因子随应变率的增加而增大;模拟与试验的破坏形态具有一致性。

关键词: 钢纤维自密实混凝土, 高温, 动态力学性能, 静态力学性能, 数值模拟

Abstract: In order to explore the influence of high temperature on the dynamic and static mechanical properties of steel fiber reinforced self-compacting concrete (SFRSCC), the dynamic and static mechanical properties of SFRSCC at room temperature (25 ℃) and after heat treatment at different temperatures (200, 400, 600, 800 ℃) were tested, and the numerical simulation analysis was carried out by combining LS-DYNA software and HJC constitutive model. The results show that the static compressive strength of SFRSCC increases first and then decreases with the increase of temperature grade, and reaches the maximum value of 66.9 MPa at 200 ℃. Under the same level of impact load, with the increase of temperature grade, the dynamic compressive strength of SFRSCC increases first and then decreases, and reaches the maximum at 200 ℃. The dynamic compressive strength of SFRSCC increases with the impact load level, and the dynamic strength growth factor increases with the increase of strain rate. The failure modes of simulation and test are consistent.

Key words: steel fiber reinforced self-compacting concrete, high temperature, dynamic mechanical property, static mechanical property, numerical simulation

中图分类号:

TU528

朱明, 宫能平, 穆朝民, 蔡天宇, 章雨. 高温后钢纤维自密实混凝土动、静态力学性能研究[J]. 硅酸盐通报, 2023, 42(11): 3895-3905.

ZHU Ming, GONG Nengping, MU Chaomin, CAI Tianyu, ZHANG Yu. Dynamic and Static Mechanical Properties of Steel Fiber Reinforced Self-Compacting Concrete after Exposed to High Temperature[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(11): 3895-3905.

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