波形钢腹板预应力混凝土箱梁的试验研究

Experimental research on prestressed concrete box girderwith corrugated steel webs

为研究波形钢腹板预应力混凝土箱梁这种新型桥梁结构的力学性能,根据国外已建实桥的箱梁尺寸,设计了缩尺模型试验梁。通过测试模型梁在静力荷载作用下的挠度和应变,来分析这种箱梁结构的弯曲、扭转和畸变等力学特性。试验结果表明:在弯曲荷载作用下,波形钢腹板主要承担剪力,而弯矩仅由混凝土顶板和底板来承担,同时箱梁的挠度应计及钢腹板的剪切变形的影响。另外,波形钢腹板预应力混凝土箱梁对偏心荷载作用时产生的扭转变形和畸变的抵抗能力相对较差。波形钢腹板预应力混凝土箱梁具有区别于传统混凝土箱梁结构的的力学特性。

In order to investigate mechanical performances of prestressed concrete box girder with corrugated steel webs, scaled model test girders are designed, which are based on sizes of foreign bridges. Through measuring deflection and strain of test girders under loading, performances of this type of box girder, including bending, torsion and distortion are analyzed. Test results show that corrugated steel webs bear largely shear, and bending moment is only burden by concrete top and bottom slab under bending. At the same time, deflection of box girders should include influence of shear deformation of steel webs. In addition, resistibility of this type of box girder to torsion and distortion under eccentric loading is low. Distinguished with conventional box girders, prestressed concrete box girders with corrugated steel webs possess itself mechanical performances.