The study of the mechanical properties of circular-hole honeycomb composite beams after fire can provide reference basis for the evaluation of building structures after fire.Static loading tests were carried out on four pieces of honeycomb composite beams with circular holes after fire and one honeycomb composite beams with circular holes without fire,so as to study the effects of fire,stiffener,and porosity on failure forms,flexural stiffness and load-bearing capacity of honeycomb composite beams after fire.The results indicate that:the flexural stiffness and ultimate load-bearing capacity of honeycomb composite beams can be improved by reducing the porosity.Compared with those without stiffeners,the ultimate load-bearing capacity of the honeycomb beam with circular holes after fire is increased by 6.9％.Before and after fire,the honeycomb composite beams with circular holes all bend and fail under static load,however,after the fire,the cracking load,ultimate load-bearing capacity and ductility are all decreased by different magnitudes.The calculation method of residual flexural capacity of honeycomb beam with circular holes after fire is proposed,which boasts high accuracy.
关键词
圆形孔蜂窝组合梁/火灾后/静力试验/承载力/破坏形态
Key words
honeycomb composite beams with circular holes/after fire/static test/load-bearing capacity/failure mode
维普
万方数据