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预应力混凝土(PC)连续箱梁桥作为中国大跨度桥梁结构中的典型桥型之一,其服役期内开裂和主梁下挠问题较突出,而主梁纵向预应力体系直接影响结构应力水平,可以改善相关病害。该文通过统计分析中国不同地区高速公路上7座不同跨径PC连续箱梁桥,计算主梁典型截面在恒载、收缩徐变、温度和汽车荷载作用下的荷载效应,分析不同跨径的预应力箱梁桥在支座截面和中跨跨中L/2截面处各荷载作用产生的内力、应力范围,探讨了不同跨径范围主梁弯矩、应力变化规律。
Prestressed concrete (PC) continuous box girder bridges, as one of the typical bridge types in China’s long-span bridges, have prominent problems of cracking and deflection under the main girder during their service life, while longitudinal prestressing systems of the main girders directly affect the structural stress levels , Can improve the related diseases. By means of statistical analysis of seven different span PC continuous box girder bridges on different parts of China, the load effect of typical cross section of main girder under constant load, shrinkage and creep, temperature and vehicle load is calculated. Prestressed box girder bridge in the cross-section of the mid-span and L / 2 cross-section of the load generated by the internal forces and stress range, to explore the different span of the main beam bending moment and stress changes.