开孔板连接件布置方法试验研究

Experimental Study on Layout Method of Perforated Plate Connector

基于42个推出模型试验数据,对组合结构桥梁中开孔板连接件的布置方法进行研究。结果表明:混凝土强度增加可以提高开孔板连接件抗剪承载力随孔径增加的增长率;孔径和孔中钢筋直径相互匹配能有效提高开孔板连接件的抗剪承载力;混凝土板厚度、开孔板板厚、板高和板间距对抗剪承载力影响较小;为充分发挥开孔板连接件的抗剪能力,实际结构中开孔板厚度宜大于8 mm,板间距不宜小于5.5倍孔径。

Based on the data of 42 push-out tests, the layout method of perforated plate connectors in a composite structure bridge is studied. The results show that the improvement of the concrete strength can increase the growth rates of the shear bearing capacity of a perforated plate connector with the increment of diameter. The matching of the bore diameter with the reinforcing bar diameter in hole can effectively improve the shear bearing capacity of a perforated plate connector. The thickness of a concrete slab, the thickness and height of a perforated plate, and the spacing between two plates have less impact on the shear bearing capacity. To fully play the shear bearing capacity of a perforated plate connector, the thickness of a perforated plate should be more than 8mm, and the spacing between two plates should be more than 5.5 times of the diameter of a hole in the practical structure.