摘要
采用落锤冲击试验机和自行设计的高温试验炉,进行了火灾作用下钢管混凝土梁抗冲击性能试验研究。考察了受火时间、冲击能量对常温和火灾下钢管混凝土梁抗冲击性能的影响。试验测试了火灾下构件核心混凝土和钢管表面的温度、冲击力和挠度变形时程曲线以及残余挠度变形等数据。试验结果表明,火灾下钢管混凝土梁仍具有良好的抗冲击性能,构件的弯曲程度和塑性区长度随受火时间的延长而增大,随着冲击能量增大而减小;最大冲击力随受火时间的延长而减小,随冲击能量的增大而增大。研究结果可为钢管混凝土梁抗火灾倒塌性能评估和设计提供参考。
Drop weight equipment together with a purpose-built furnace was used to experimentally study the behavior of concrete-filled steel tubular（CFT） beams in fire.The influences of fire duration time and impact energy on the impact resistance behavior of CFT beams in fire were discussed.The temperature versus time relationships of core concrete and steel tube surface,the impact force and lateral deformation versus time relationships of the tested specimens,and the residual lateral deformations were measured.The test results showed that a CFT beam in fire has an excellent impact resistance behavior;the bending level and plastic zone of the specimens increase with increase in fire duration time,but reduce obviously with decrease in impact energy;the ultimate impact force increases with increase in fire duration time,but reduces with decrease in impact energy.The results could be used to evaluate the anti-collapse behavior of CFT beams and provided a reference for their design.
出处
《振动与冲击》
EI
CSCD
北大核心
2012年第20期110-115,共6页
Journal of Vibration and Shock
基金
长江学者和创新团队发展计划教育部创新团队(IRT0619)
国家自然科学基金项目(50778069
50678065)
关键词
钢管混凝土梁
火灾下
落锤
抗冲击性能
concrete-filled steel tubular（CFT） beam
in fire
drop weight
impact resistance behavior
