Experimental studies on mechanical behavior of continuous composite girder with prefabricate prestressed concrete slab

According to the issue of concrete cracking on the hogging moment zone of steel and concrete continuous composite girder, a new type composite girder with prefabricate prestressed concrete slab was proposed. To compare the mechanical behavior difference between this new type continuous composite girder and the common continuous composite girder, static experiments of these two type continuous composite girder were conducted. The main mechanical behaviors including girder deformation, strain distribution, concrete cracks, relative slip between steel and concrete, bearing capacity and so on were tested. The testing results show that the initial concrete cracking load and serviceability limit state load of continuous composite girder with prefabricate prestressed concrete slab are 3.16 times and 2.61 times those of common continuous composite girder respectively. The calculation tests the initial concrete cracking moment of this new type continuous composite girder is 1.54 times that of common continuous composite girder when they acted same prestressing force.