Concrete Torsion Shear Creep Experimental Method and Application

Abstract:

To study the effect of shear creep on long-term deformation of large span concrete bridge, aiming at the problem of shear creep coefficient, an experimental device and test method based on torsion was proposed for shear creep test. Three groups of shear creep members were tested to obtain creep coefficient curve lasted in 375 days. And based on the modification of axial compression creep model of current specification, the rules of shear creep progress was analyzed with finite element(FE) analysis verification. The results show that the shear creep test device based on torsion can be used to load the concrete element effectively. And creep coefficient formula deduced from torsion creep can be used for test data analysis. The C30 concrete shear creep ultimate value is 2.26~2.63 times of specification compression model. The early aged shear creep progressed smaller than compression creep, but accelerated in the later age. Torsion and other significantly shear effected structures should consider shear creep action in creep analysis.