Abstract：In order to study the eccentric compression performance of the disconnectable coupling joint of steel bracing system for foundation pit, a finite element model was established and verified by the existing test results. Based on the numerical model, the influences of different eccentricities on the bearing capacities of the disconnectable coupling joint were analyzed, and then the influences of the key parameters of the joints on the bearing and bending capacities of the disconnectable coupling joint were studied in detail. The analysis results show that the eccentricity of the disconnectable coupling joints should not exceed the outer edge of the box-body; the batten plate can improve the flexural performance of the disconnectable coupling joints effectively; the bearing capacity and bending resistance of the disconnectable coupling joints increase with the steel wedge length, steel wedge width, steel plate thickness and box-body length; and the bearing capacity and bending resistance of the disconnectable coupling joints can be improved evidently through the change of the steel plate thickness.
