建筑结构学报2017，Vol.38Issue(4)：98-108,11.DOI:10.14006/j.jzjgxb.2017.04.012
高温后钢筋再生混凝土梁受力性能试验及承载力计算
Mechanical behavior and calculation on bearing capacity of reinforced recycled aggregate concrete beam after elevated temperature
摘要
Abstract
To investigate the mechanical behavior of reinforced recycled aggregate concrete beam (RRACB) after exposure to elevated temperature,34 specimens,including 26 specimens after high temperature and 8 specimens at room temperature,were designed for static loading test.The replacement percentage (RP) of recycled coarse aggregate,highest temperature,concrete strength and shear span ratio were considered as parameters.The failure mode of specimens was observed and the ignition mass loss,load-deflection curves,strain distributions of crosssection,peak load,peak deflection were obtained from the test.The bearing capacity,bending,ductility and damage value of specimens with different parameters were investigated.Meanwhile,a calculation method of flexural bearing capacity and shear capacity on RRACB after high temperature was put forward.The results show that the failure modes of RRACB after high temperature are similar to those under normal temperature.All the failure modes of specimens are bending failure and shear failure.With the increase of temperature and RP,the mass loss increases gradually,ranging from 0.44％ to 8.95％.The residual bearing capacity,peak deflection and ductility value of RRACB are superior or comparable to those of conventional reinforced concrete beam.With the increase of RP,the bearing capacity and ductility increase initially and decrease afterwards,the peak deflection and damage increase gradually.The higher the temperature,the lower the bearing capacity,peak deflection,ductility value,and the greater the damage.The increase of shear span ratio reduces the bearing capacity and increases the peak deflection.Improving the strength of concrete can enhance bearing capacity and decrease peak deflection.关键词
钢筋再生混凝土梁/高温试验/静力试验/受力性能/承载力Key words
reinforced recycled aggregate concrete beam/high temperature test/static test/mechanical behavior/bearing capacity分类
建筑与水利引用本文复制引用
陈宗平,周春恒,梁莹,吴波..高温后钢筋再生混凝土梁受力性能试验及承载力计算[J].建筑结构学报,2017,38(4):98-108,11.基金项目
国家自然科学基金项目(51268004,51578163),广西自然科学基金重点项目(2016GXNSFDA380032). （51268004,51578163）
