摘要
采用落锤冲击试验机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。
Abstract
Drop weight equipment together with a purpose-built furnace were used to experimentally study the behavior of concrete-filled steel tubular (CFT) beams in fire. The influences of fire duration time, impact energy on the impact resistance of CFT beams in fire were discussed. The temperature versus time relationships of core concrete and steel tube surface, the force and lateral deformation versus time history relationships of the tested specimens, the residual lateral deformations were measured. The test results show that CFT beam in fire has an excellent impact resistance. The degree of bending and plastic zone of the specimens increased with the increasing of fire duration time, but reduced obviously with decreasing of impact energy. The ultimate force increased with the increasing of fire duration time, but reduced with decreasing of impact energy. The experimental results can be used to evaluate the anti-collapse resistance and design of CFT beams.
关键词
钢管混凝土梁 /
火灾下 /
落锤 /
抗冲击性能
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Key words
Concrete-filled steel tubular beam /
In fire /
Drop weight /
Impact resistance
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任晓虎;霍静思 陈柏生.
火灾下钢管混凝土梁落锤冲击试验研究[J]. 振动与冲击, 2012, 31(20): 110-115
Ren Xiao hu; Huo Jing si Chen Bai sheng.
Impact behavior of concrete-filled steel tubular beams in fire[J]. Journal of Vibration and Shock, 2012, 31(20): 110-115
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