The Ant in block shear capacity can become negative when the forces applied to the connection are not properly balanced. Block shear failure occurs when a tension force applied to the connection is not balanced by a corresponding compression force. This results in the shear plane fracturing, causing the Ant in block shear capacity to become negative.
To adjust the connection, several modifications can be made. First, the thickness of the material can be increased to increase the capacity of the connection. Second, the length of the connection can be increased to distribute the load over a larger surface area. Third, a welding or bolting reinforcement can be added to increase the strength of the connection.
It is important to note that the specific adjustments needed will depend on the specific situation and the forces involved. Proper design and engineering analysis should be conducted to ensure the connection can withstand the forces applied to it.
PH