用于組合梁橋面板濕接縫的弧形鋼筋連接構(gòu)造
[Abstract]:According to the mechanical characteristics of precast deck slab in composite beam bridge at wet joint and the connection form of steel bar in existing joint, a new type of arc-shaped steel bar connection structure with simple structure and convenient construction is put forward. In order to test the mechanical properties of the connection structure, the axial tensile test of the full-scale model is carried out, and the mechanical properties of the connection mode of the straight steel bar and the U-shaped steel bar are tested and compared with those of the existing straight steel bar connection mode and the U-shaped steel bar connection mode. The cracking load, ultimate load and crack distribution of three kinds of wet joints are analyzed. The test results show that the connection mode of arc steel bar is the same as that of straight steel bar and the wet joint failure mode of U-shaped steel bar. The cracking load of the wet joints corresponding to the three kinds of reinforcing bar connections are basically the same, and with the increase of the width of the old cracks, the new cracks appear one after another. Finally, when the tensile limit state is reached, the wet joints of the three kinds of steel bar connections are all the steel bars near the interface of dry and wet concrete to yield. At this time, the strain of steel bar in the middle of the joint is 1 / 2 of the strain of steel bar at the interface, and the ultimate tensile capacity of the wet joint is slightly higher than that of the other two. In theory, the distribution of steel bar in the thickness direction of the wet joint of arc steel bar in the wet joint region is more uniform, which can improve the bearing capacity to a certain extent. The test also proves that the wet joint of arc-shaped steel bar is better than the other two ways in controlling the crack width of concrete and the bearing capacity of the specimen, so it is feasible and reliable to apply the arc-bar connection mode in practical engineering.
【作者單位】: 同濟大學(xué)土木工程學(xué)院;
【基金】:國家重點基礎(chǔ)研究發(fā)展計劃(“九七三”計劃)項目(2013CB036303)
【分類號】:U443.31
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