装配式小箱梁桥荷载横向分布计算的弹性支承框架法

Elastic Supporting Frame Method for the Calculation of Load Transverse Distribution of Small Box Girder

文中以大广29标采用的小箱梁为研究对象,将小箱梁横截面取为框架模型,各片小箱梁纵向的抗弯和抗扭刚度等效成弹性支承,利用杆系有限元分析框架在单位移动荷载作用各片小箱梁(对应为弹性支承)的横向影响线,得到小箱梁的横向分布系数,并与修正的偏心压力法、刚接梁法、空间实体模型等方法的结果进行比较。得到的结果与修正偏心压力法极为接近,与刚接梁法的最大偏差也在-5%以内,说明此法的可行性和准确性。

Taking the small box girder cross-section as a framework model, the longitudinal bending resistance and torsional stiffness of each piece small box girder is equivalent to the elastic support. Using the finite element to ana-lyze the transverse influence line of each piece small box girder which is under the influence of the framework mov-ing in truss units. the transverse distribution coefficient is obtained and compared with the result gained through the eccentric pressure correction method, the rigid beam method, the space entity model and other methods. It shows that the result is extremely close to the one by the eccentric pressure correction method within 5%maximum deviation, which proves the feasibility and accuracy of this method.