ABSTRACT
Concrete-Partial-filled narrow-width steel box composite beam is a new type of steel composite beams based on the rectangle steel tube concrete structures and steel box-concrete composite beams. Its positive bending section is the same as the common steel box-concrete composite beams and in the negative moment region compression area of the steel box girder is filled with concrete[1]. So it can improve the structure behavior of the continuous composite beams in the negative moment regions and make its stress characteristics similar to concrete-filled rectangular steel tube eccentric compression member. Compared with the traditional steel box-concrete composite beams not only have large stiffness, light weight, high bearing capacity but also the local stability and global torsion performance are
good characteristic[2,3]. Three-dimensional pressure state of concrete is better to play its compression resistance capability. Through experimental research, this paper expounds the experimental phenomena, component characteristics of local damage, the cracking mechanism and development regularity of cracks in the negative moment region and composite beams section stress distribution.
