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Abstract The internal force distribution in lattice beams of prestressed lattice anchorage system under the action of prestress，in the process of landslide and at the limit state of the landslide was investigated through large-scale physical modelling test. The test results were compared with the ones calculated with the reverse beam method. It was found that the strains in lattice beam increased gradually in the process of landslide development with two extreme values，of which the positive maxima occur at the mid-spans and the negative maxima appear at the nodes. The abstract values of the latter were greater than the former. The mid-span of the beam was in lateral tension while the node part was in lateral compression. The strains in horizontal beam were symmetrical while the strains in vertical beam were increased from top to bottom. In the prestressing stage，the forces in each horizontal beam and each vertical beam were the same. But in the limit state，the forces in horizontal beams increased from top to bottom. The internal forces in bottom beam was significantly greater than that in top beam. The forces in horizontal and vertical beam were different. The bending moments at the nodes of horizontal beam were greater than that of vertical beam. The internal forces of the test values and theoretical values with the reverse beam method had basically the same trend，which were relatively close at two ends but were different at the middle part. The method of reversing beam cannot reflect the exact state of forces in the middle of beams.
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2015, Vol. 34 
