Abstract：Thirteen specimens of shear wall, with shear span ratio of 1.5 and section longitudinal reinforcement ratio as 1.7%, 2.5% and 3% respectively, were well designed and tested under the low-frequency cyclic static loading. The tests results show that the shear capacity of shear wall may decrease with the increase of tension force and increase with the increase of longitudinal reinforcement ratio. Under the combined action of tension force and shear force, shear wall may fail in the shear-compression mode or in the slip mode depending on the magnitude of tension force. Based on the test results, the boundary line of failure modes was drawn and the formula of critical point was derived. The formula shows that for higher axial force, the specimens with lower longitudinal reinforcement ratio tend to fail in the slip mode. Based on the theoretical analysis and the empirical formula, the term of boundary longitudinal reinforcement was added to the shear capacity formula of shear-compression mode. According to experimental data, the influence coefficients of tension force and boundary longitudinal reinforcement in the shear capacity formula were ?0.2 and 0.04 respectively in the shear-compression failure mode; and the influence coefficients of tension force and section longitudinal reinforcement in the shear capacity formula were ?0.6 and 0.6 respectively in the slip failure mode.
