摘要
将钢纤维掺入高强混凝土中,可以改善高强混凝土的脆性,进而可提高结构构件的延性。为研究钢纤维高强混凝土抗压性能,分别对强度等级为C60和C80,钢纤维体积率为0%、1.0%、1.5%和2.0%的钢纤维高强混凝土进行立方体抗压强度试验以及单调和重复荷载作用下的轴心抗压全过程试验。试验结果表明:随着钢纤维体积率的增大,混凝土强度基本没有改变,但相应于峰值应力的应变略有增加,而弹性模量稍有下降。在已有研究的基础上,提出了适用的钢纤维高强混凝土轴压应力-应变曲线数学表达式和受重复荷载作用的钢纤维高强混凝土的卸载曲线和再加载曲线表达式。所提出计算式得到的结果与试验结果吻合较好,可为钢纤维高强混凝土结构的设计和非线性分析提供理论基础。
Higher strength of concrete usually means the greater brittleness and the worse ductility, which has an extremely unfavorable effect on seismic performance of structures. Combining steel fiber and high-strength concrete, high-strength steel fiber reinforced concrete （HSSFRC） has high strength along with good toughness. Uniaxial compression experiments on HSSFRC under monotonic and repeated loadings were conducted in order to study the compressive properties. The volume fractions of steel fiber were 0%, 1.0%, 1.5% and 2.0% with the cube compressive strength of 60 MPa and 80 MPa, respectively. The effects of steel fiber volume fraction on uniaxial compressive strength, strain corresponding to the peak stress and elasticity modulus of HSSFRC were all investigated. Based on the test data and the literature of stress-strain curve expression, a more suitable analytical model is proposed to generate the stress-strain curve of HSSFRC. Also the unloading and reloading model for stress-strain curve of HSSFRC under repeated compressive load is established. All the models agree well with the experimental curves and can be used for nonlinear analysis of structures.
作者
吕西林
张颖
年学成
LU Xilin ZHANG Ying NIAN Xuecheng(State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China Jiangsu Provincial Architectural D＆R Institute LTD, Nanjing 210019, China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2017年第1期135-143,共9页
Journal of Building Structures
基金
国家自然科学基金重大国际合作项目(51261120377)
土木工程防灾国家重点实验室基金项目(SLDRCE14-A-07)
关键词
钢纤维高强混凝土
钢纤维体积率
单调加载
重复加载
弹性模量
轴压应力-应变曲线
卸载曲线
再加载曲线
HSSFRC
volume fraction of steel fiber
monotonic compressive loading
repeated compressive loading
elasticity modulus
stress-strain curve under compression
unloading curve
reloading curve
