预应力、部分预应力、钢筋混凝土梁在疲劳荷载作用下挠度试验研究

The Experimental Research of Deflection in Prestressed,Partially Prestressed and Reinforced Concrete Beams under Cyclic Fatigue Loading

本文进行了42根不同预应力度、不同配筋、不同截面形式、不同高跨比模拟梁在静载和重复荷载作用下挠度试验研究。对首次加载和200万次后加载实测结果进行了对比,给出了预应力、部分预应力、钢筋混凝土梁在疲劳荷载作用下挠度统一计算模式,供《桥规》修改时参考。

Tests are conducted on deftection of 42 concrete beams subjected to static and repeated loading which cover the effects on beam deflec- tion with various parameters such as the partial prestressing ratio, the amount of reinforcing and prestressing steel,the type of beam section and the ratio of girder depth over span.The experimental results at first loading and those after 2 million cycles loading are compared and a unified model to calculate deflection in prestr- essed,partially prestressed and reinforced concrete beams is propo- sed in the paper and recommended for reference in revising Railway Bridge Design Code.