Experimental investigation of deformation and crack variation rules of segmental pre-stressed concrete box beams under bending and shearing

• 1、College of Civil and Transportation Engineering, Hohai University, NanJing 210098
• 2、College of Civil and Transportation Engineering，Hohai University，Nanjing 210098

Abstract：Segmental precast concrete bridge (SPCB) was widely used becase it has good quality in precasting and short time using in exercution and low environmental impact. This paper is concerned with the deformation and crack variation rules of SPCB under shearing and bending. The specimens which was poured on the size of a real bridge with 1:10 scale ,were tested for destructive testing. The study showed that the failure mode of SPCB for bonded joints split was obviously different from integral type concrete beams. The failure location was happened in mutation of flexural torque and shear, while the other place of the beam is in normal operating condition. Different pre-stressed level leaded different failure. The failure mode of beam with upper pre-stressed rate was the failure mainly by shearing after joints split while dislocation appeared between segments and some diagonal cracks came out in the top slab. The lower rate beam was destroyed by coupling effect mainly by bending and the phenomenon of dislocation and diagonal cracks was not obvious. However, the failure mode of two specimens belonged ductile fracture.

Keywords： segmental precast concrete bridge(SPCB) bending and shearing deformation crack development failure mode