Experimental study on the effect of process holes on the bending performance of large-section partially-encased composite beam with steel and concrete
In order to investigate the influence of process holes on bending performance of large-section partially encased composite beams(large-section PEC beams),static tests were conducted on five differently configured large-section PEC beams.Influence of web opening mode in the primary and secondary beam on bending performance,ductility and failure mode of large-section PEC beam specimens under two-point loading was studied.The results show that under static loading,all specimens exhibit good ductility,and the opening of holes in the web has a certain weakening effect on bearing capacity and section stiffness of the specimens.The strains in the main steel components and concrete along the height direction of the cross-section generally show linear variations,which consistents with the assumption of a plane section.The calculated bending capacity of the large-section PEC beams with process holes based on the Technical specification for partially-encased composite structures of steel and concrete(T/CECS 719-2020)has a small error with experimental values.The influence of size effects is minimal,indicating the reliability and safety of the adopted calculation formula.
large-section partially-encased composite beam of steel and concreteprocess holedamage modebending capacityductility
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