连续刚构桥竖向接缝的质量及其对工后挠度的影响

Quality of vertical joints in continuous rigid bridges and its influence on the post-construction deflection of the bridges

笔者分析了大跨度预应力砼连续刚构普遍存在后期挠度过大的一个重要原因———主梁节段间竖向接缝的质量,讨论了在长期荷载作用下竖向接缝处砼的剪切徐变,认为在现有施工条件下由竖向接缝的剪切变形引起主梁挠度的增量是不可忽视的,提出了改善主梁节段间接缝质量的一些注意事项及构造措施.

In the paper one of the crucial causes of the excessive post-construction deflection generally occurring on large-span prestressed-concrete continuous rigid bridges, the quality of the segmental vertical joints, is analyzed. The shearing creep of the concrete filling the vertical joints under long-term loads is discussed to find that, in the case of the existent construction procedure, the increments of the deflection of the bridge main girders resulting from the shearing creep of the vertical joints should not be neglected. And the key items and configuration measures for improving the quality of the segmental vertical joints are proposed.