The main differences between bolt friction type and pressure type connections lie in the limit state, calculation method, application range and force characteristics. ‌

Limit states and calculation methods

Friction type connection ‌ : its limit state is that the external shear force does not exceed the maximum friction force, and the plate does not occur relative slip deformation. The calculation method is based on the maximum friction force and the relative friction area is calculated to improve the integrity and stiffness of the connection ‌.

Pressure type connection ‌ : its limit state is to allow the external shear force to exceed the maximum friction force, and the relative sliding deformation between plates occurs until the bolt rod contacts the hole wall. The calculation method needs to consider the shear force of the rod body and the bearing pressure of the hole wall, and comprehensively consider the plate slip and other factors ‌.

Application range and force characteristics

Friction connection ‌ : suitable for important structures or structures bearing dynamic load, because of its close connection, small deformation, reliable force transmission, good fatigue performance. Because it does not allow sliding, it is suitable for elastic overall load, mainly used in Bridges, high-rise buildings and other occasions that need to ensure connection stability and safety ‌.

Pressure type connection ‌ : suitable for bearing static load or indirect dynamic load of the structure.