In the present study, in-plane shear tests were performed on mud walls with inclined columns, and the failure mode and P-effect on the strength are verified. In addition, numerical computation with 3D frame model of the houses was conducted in order to verify the effect of the inclined columns on the seismic strength of the houses in the large deformation area. As the experimental results, there was no significant differences in failure mode between the standard specimen and the specimen with

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... clined columns. The load, however, decreased rapidly as the drift angle increased because of the negative shear force due to the P-effect. In addition, the inclined columns were found to be sunk into the base by cyclic loading because of the stress concentration