波形钢腹板预应力混凝土组合箱梁扭转与畸变研究进展

有别于传统的混凝土箱梁，波形钢腹板预应力混凝土组合箱梁是一种较为新颖的桥梁上部结构形式，这种箱梁结构在偏心荷载作用下产生的扭转与畸变效应相对显著。为阐明这种箱梁的扭转与畸变特性及其研究现状，通过对大量文献的调研与实桥调查，系统介绍了箱梁扭转与畸变效应的计算理论（包括抗扭刚度）、扭转承载力、内力增大系数、横隔板的设置等方面的研究进展情况。研究表明，采用Umanski第二理论和弹性地基梁比拟法分别计算这种箱梁的扭转与畸变效应在理论上是可行的，但其工程适用性还需进行进一步检验。另外，我国在扭转承载力研究方面还较为欠缺，而在内力增大系数、横隔板的设置等方面尽管已经取得了一些成果，但还缺乏较为一致的结论。在充分考虑箱梁自身受力特性的基础上，加强波形钢腹板预应力混凝土组合箱梁扭转与畸变的研究，可为完善其设计方法奠定理论基础与提供更有力依据。

Review on torsion and distortion in prestressed concrete box girders with corrugated steel webs

The prestressed concrete box girder with corrugated steel webs is a relatively new form of bridge superstructure. When subjected to eccentric loads, this type of box girder is significantly different from the traditional concrete box girder in torsion and distortion. To clarify the state of the art of these two perfomances, a related literature investigation and a summary of real bridges have been conducted, and the research progress of a series of issues is introduced in detail, including the calculation theories of torsion and distortion (including torsional stiffness), the torsional ultimate bearing capacity, the internal force increasing coefficients, and the design of concrete diaphragms. Results show that it is theoretically feasible that the second theory of Umanski and the method of beam on elastic foundation analogy are used in analyzing torsion and distortion of this type of box girder respectively, but their engineering applicability needs further verification. In addition, related studies on the torsional ultimate bearing capacity of this structure are very rare in China. Although some research achievements on the internal force increasing coefficients and the design of concrete diaphragms have been obtained, there is still a lack of more consistent conclusions. Based on full consideration on structural behaviors of this type of girder itself, the relevant studies on the structural performances of torsion and distortion should be strengthened and then they could provide the theoretical foundation and theoretical basis for improving its design.