早龄期钢筋混凝土柱高温后力学性能研究  

Study on the mechanical property of early age concrete columns after high temperature

作　　者：王磊[1] 袁广林[1] 周立欣[1] 

机构地区：[1]中国矿业大学力学与建筑工程学院,江苏徐州221008

出　　处：《混凝土》2011年第11期11-13,共3页Concrete

基　　金：国家自然科学基金(59978008)

摘　　要：通过试验研究了不同养护龄期(14、28 d)受高温后的钢筋混凝土柱在小偏心荷载下构件的承载力及变形退化规律。结果表明:养护龄期为14d的柱高温后其相对抗压强度和残余抗压强度均大于28d龄期柱,且柱的挠度和轴向变形增长幅度明显小于龄期为28 d柱的增长幅度;14 d龄期的钢筋混凝土柱在常温下和550℃高温后测得的荷载-挠度曲线及荷载-轴向变形曲线都有明显的下降段,而28 d龄期柱高温后的曲线下降段不完整。这说明,养护龄期为14 d的柱高温后残余强度、延性均优于龄期为28 d的柱,14 d龄期的钢筋混凝土柱耐火性能较好,这些研究成果可为不同龄期钢筋混凝土结构受火后的评估提供参考。The residual load bearing capacity and deformation degradation rule of RC columns after high temperature were tested,and different maintenance ages（14、28 d）,little decentration loading were considered.The result indicated that the relative and residual compressive strength of the 14 d column were larger than the 28 d column,meanwhile the increased amplitude of the deflection and axial deformation was less.The load-deflection and load-axial deflection curves of the 14 d column at normal temperature and 550 ℃ high temperature have a marked decline section,but the curve of the 28 d column after high temperature was incomplete.The residual strength and ductility of the 14 d column after high temperature were better than the 28 d column.The 14 d age RC column has a good fire resistant performance.These results will provide references for the damage assessment of concrete structure in different ages after fire.

关 键 词：早龄期 高温 钢筋混凝土柱 力学性能 

分 类 号：TU528.01[建筑科学—建筑技术科学]