中文摘要：

波纹钢腹板组合箱梁结构以波纹钢腹板代替传统的混凝土腹板,实现了主梁的轻型化。针对波纹钢腹板组合箱梁的破坏机理,研究了2根波纹钢腹板组合箱梁的静力和疲劳性能。记录了试验中裂纹萌生、扩展的全过程,分析了试件破坏模式、承载力、荷载–挠度曲线、荷载–应变曲线,并通过材料力学公式对100 k N时梁挠度进行计算。结果表明：箱梁破坏时纵向裂纹萌生于混凝土底板,纵向贯通拉裂后,波纹钢腹板与底板之间产生纵向滑移,混凝土销剪切错动破坏。实际工程中应对混凝土底板进行FRP加固或设置预应力筋减缓裂纹萌生以及扩展;箱梁具有很好的疲劳耐久性,疲劳试验中裂纹扩展缓慢,当P_（max）为静力试验承载力的50%时,疲劳寿命超过6×106周次;箱梁受力符合拟平截面假定,混凝土顶底板主要承受弯矩,波纹钢腹板主要承受剪力。挠度计算结果略小于试验值,属于偏安全计算,误差原因主要是未考虑波纹钢腹板剪切变形对梁挠度影响。

英文摘要：

In order to investigate the failure mechanisms of box girders with corrugated steel web （BGCSW）,static and fatigue tests were performed on two BGCSWs respectively.Crack initiation and propagation evolution process were detected,and the failure mode,bearing capacity,loading-deflection curve and loading-stress curve were analyzed.Besides,beam deflection under 100 kN was calculated using the formula in mechanics of materials.The experimental results indicated that： Failure started with crack initiation and propagation throughout the concrete bottom plate,then followed by the slip between webs and bottom plate,and eventually fractured in shear at concrete dowel.Therefore,FRP or prestressed bar reinforcement in bottom plate should be adopted in practical engineering to retard the crack initiation and propagation. BGCSW exhibited good fatigue resistance because of the slow propagation of fatigue cracks.The fatigue life exceeded 6× 10^6 cycles under the cyclic loading of half static capacity. BGSCW followed the quasi plane assumption,because the concrete plate was in the deformation of bending when the webs was sustain in shearing. The deflection calculating by the formula was slightly lower than that of experiment,which can be ascribed to that the ef- fect of corrugated steel beam shearing deformation on the deflection was neglected.