ABSTRACT
ABSTRACT To investigate the influence of group studs stiffness on the behavior of accelerated construction steel-concrete composite small box girder bridge, experimental test and finite element analysis were conducted on a steel-concrete composite small box girder with group studs. First, a finite element model of a steel-concrete composite girder was established by adopting the shell elements and spring elements, in which the spring element stiffness of group studs came from analytical results of the studied push out test specimens in terms of parameters of group studs arrangement. The values gained by FEM model were good agreement with the test values of the small box girder and confirmed that the numerical method is reasonable and right. The steel-concrete composite girder bridge has powerful recovery capability under elastic loading. It also showed that the connecting the steel girder with concrete plate by using the group studs in the accelerated construction steel-concrete composite small box girder bridges was completely feasible. Secondly, accelerated construction steel-concrete composite small box girder bridges, composed of five small box girders, with 40 m standard span, 39.2 m computing span and 16 m width, were analyzed by the same numerical method. Under completely shear state in the normal service condition, the total stiffness of the group studs gradually increases with the increase of the transverse force effect on composite girder bridge, but it has little influence on the stresses and deflections in the key section of the steel-concrete composite small box girder bridge. But the stress and deflection of the steel-concrete composite small box girder bridge increases slightly with the decrease of shear connection when the design of the composite bridge no longer satisfied the complete shear conditions.
