摘要
Abstract
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.关键词
箱梁/波形钢腹板/预应力混凝土/扭转/畸变/横隔板Key words
box girder/corrugated steel web/prestressed concrete/torsion/distortion/diaphragms分类
交通工程
