预应力混凝土V型墩连续刚构箱梁桥的空间分析

对三跨预应力混凝土双箱双室变截面V型墩刚构桥进行了在恒载及预应力下的空间分析,结果表明:一些复杂的、较宽的三向预应力桥梁,应注意预应力空间效应及箱梁剪力滞、畸变等因素,可能使箱梁底板出现较大的横向拉应力,以免结构出现开裂。而增加箱梁的中横隔板可以显著增大这种结构的横向抗弯刚度,减少箱底板横向拉应力。

Spatial Analysis on Continuous Rigid Frame Prestressed Box Girder Bridge with V Piers

Spatial analysis is made under dead load and prestress on a 3-span prestressed concrete double-b ox double-cell rigid frame bridge with variable cross-section V pier. The resu lt shows that for some tri-axial prestressed bridges with complex and wider str ucture, due to factors as prestress spatial effect and box girder shear hystere sis and deformation etc., more transverse pulling-stress is found at the botto m plate of box girder, and structural crack has also been found. The additional medium diaphragm to box girder would increase the structural transverse ben ding stiffness and decrease the transverse pulling-stress on bottom of the bo x.