武汉长江斜拉桥主梁分段施工混凝土接缝性能试验

A Study on the Behavior of the Joints on Cast-in-Place Segmental Box Girder of PC Cable-Stayed Highway Bridge Over the Yangtze River at Wuhan

根据武汉长江公路斜拉桥主梁设计的需要，进行了５片具有分段灌筑接缝的ＰＰＣ箱形模型梁的试验。结果表明，接缝处混凝土抗拉强度有明显降低，其强度降低系数初步建议取０．５；试验表明，接缝对梁的极限抗弯强度没有影响。

To check the design of PC calble-stayed highway bridge over the Yangtze River at Wuhan, five PC model box girders with joints were tested under static loading. Test results show that the tensile strength of concrete at the joints decreases significantly, but the joints haveno effect on the ultihmate flexural strength of the girders.The tensile strength reduction factor a of 0. 5 is recommended for the design.