JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. An error has occurred: (a) has horizontal loads, but the structure is automatically stabilized in the X and Y directions You cannot auto-stabilize the structure if there are horizontal loads (other than tendons). Uncheck the Auto-stabilize structure in X and Y directions box in the General tab of the Calc Options. Provide some lateral stability (e.g. shear walls, columns with sufficient moment connections, lateral springs, etc.). Parent topic: Miscellaneous