Proposed formulae for transverse distribution factor of internal forces of prefabricated small box-girder bridge
In order to simplify the stress analysis process by using the concept of transverse distribution factor(TDF)for the multi-girder fabricated continuous girder bridges,skew bridges and curved bridges,the bridge database based on a multi girder fabricated continuous small box girder bridge was established,and the finite element model of each bridge was built by using the grillage method.The influence of the girder spacing,height span ratio,skew angle and center angle on the transverse distribution coefficient of internal force was investigated,and the formulae of the transverse distribution factor of internal forces were proposed by statistical regression method.The results show that the transverse distribution factors of bending moment and shear force increase with the development of the girder spacing;With the increase of the height span ratio of the main beam λ,the transverse distribution factors for mid-span positive bending moment increases,but decrease for that of the mid-span shear force and the negative bending moment and shear force at the support;The transverse distribution factor of internal force in skew bridges and curved bridges can be obtained by multiplying the modification factor with the formula of straight orthogonal bridges.Within the scope of the calculation model in this paper,the transverse distribution factors of internal forces of multi-girder fabricated continuous girder bridges,skew bridges and curved bridges obtained by the proposed formulae are in good agreement with the finite element results,and the transverse distribution factors of internal forces of any section can be obtained by the simplified envelope diagram along the longitudinal direction.
bridge constructionprefabricated bridgetransverse distribution factorcontinuous small box-girder bridgeskewed bridgecurved bridge
万方数据
维普
