外露型钢锚箱索塔锚固结构受力机理试验

Experimental Study on Stress Mechanism of Exposed Steel Anchor Box Cable tower Achorage

摘要:

通过缩尺比例为1∶2的节段模型试验，揭示了外露型钢锚箱索塔锚固结构的受力机理，重点分析了塔壁预应力在结构中的作用效应.研究结果表明：外露型钢锚箱索塔锚固结构在中小跨径桥梁中具有较好的适用性；在塔壁不开裂的情况下，预应力不会改变水平索力在钢锚箱和混凝土塔壁之间的分配关系；预应力能够明显减少塔壁混凝土的拉应力，提高塔壁的抗裂性能，但也会降低钢板的利用率和增大焊钉剪力顺桥向作用的剪力.

Abstract:

This paper, based on a model experiment of 1/2 reduced scale, reveals the stress mechanism of exposed steel anchor box cable tower anchorage and analyzes the effect of the prestress. The results show that the exposed steel anchor box cable tower anchorage is suitable for the cable stayed bridge of small span. In the condition of no crack occurred in the concrete tower wall, prestress does not change the distribution of the horizontal cable force between the steel anchor box and the concrete tower wall. Prestress can obviously reduce the tensile stress of concrete tower wall and then improve the performance in crack resistance. However, prestress will also reduce the ratio of utilization of steel anchor box and add the shearing force of studs.