波形钢腹板PC箱梁纵向刚度分析

Longitudinal Stiffness of Prestressed Concrete Box-girder Bridge with Corrugated Steel Webs

波形钢腹板PC组合箱梁在轴向预压力作用时能自由伸缩,纵向预应力几乎不再分散到腹板当中,波形钢腹板对由上、下混凝土翼板的徐变、收缩产生的变形将不再约束,从而避免了由于钢腹板的约束作用而造成箱梁截面预应力损失。本文就针对波形钢腹板PC组合箱梁的纵向刚度进行具体分析。

The composite prestressed concrete box-girder bridge with corrugated steel webs can expend freely under the axial pressure, and the longitudinal prstress will not disperse to the webs nearly. The corrugated steel webs wiU not restrain the shape transformation produced by creep and shrink of the upper and lower concrete flange plates, so as to avoid the prestrss loss of the box-girder section produced by the restraint of the steel webs. Based on all these, the longitudinal stiffness of the composite prestressed concrete box-girder bridge with the corrugated steel webs is analyzed particularly.