Research On Transverse Load Distribution Factors For Jointless Bridges

Jointless bridges are becoming more popular and were used widely due to many advantages and little limitations. An important consideration in the design of bridge structures is confirming the transverse load distribution factors to idealize the three-dimensional field as planar issue. While whether the design of transverse load distribution factors for traditional hinge bridges can be applied in jointless bridges is not mentioned in specifications. Later distribution factors in hinge bridges, because of being too simplistic in basic assumptions, have been found to be unrealistic for jointless bridges. Transverse load distribution is different for jointless bridges because the effective span of the bridge is shortened because of partial fixity at the abutments. So, some researches are present in this paper:In this paper, a finite element model of jointless bridges with integral abutment supported on piles is brought forward, considering the interaction between structure and soil. later distribution factors of moments and distortions, variation of transverse load distribution factors along span, effect of interior girders are investigated, and a representative method is developed to further study transverse load distribution factors for jointless bridges.A model test is performed to validate the finite element model and the conclusions made in first step.Parameters influencing transverse load distribution factors in jointless bridges are discussed, which include pile length, bending stiffness of pile, comparative bending stiffness of pile, bending stiffness of abutment, abutment length, different type of soil behind abutment, bending stiffness of girders, stiffness of beam and spans of a bridge. And the main influencing parameters were picked up.A chart about later distribution factors for slab-on-girder bridges is presented in this paper, which is developed by taking into account the main parameters based on engineering practice.The transverse load distribution factors is determined in the field from stringer strains and distortion. And compared with those in joints bridges.