Connections between girders and columns can be categorized into which two types?

The categorization of connections between girders and columns into pin-type and moment-resisting is essential for understanding how these connections influence structural performance.

Pin-type connections are designed to allow rotation between connected elements, which means they do not resist moment forces. This characteristic is beneficial in certain structural systems where flexibility is required, allowing the structure to sway under loads like wind or seismic forces without sustaining significant damage. These connections typically provide a simplified analysis of the structure because they transfer vertical loads but not lateral forces.

On the other hand, moment-resisting connections are capable of transferring both vertical loads and lateral forces, providing rigidity to the structure. This type of connection is critical in designing buildings that need to withstand bending moments caused by various loads. Their unique design allows girders and columns to act as a unified system, enhancing the overall stability and rigidity of the structure, which is particularly important in high-rise buildings and areas prone to seismic activity.

Other choices like flexible and rigid focus more broadly on general movement abilities rather than the specific characteristics of joint behavior under load. Temporary and permanent refer to the usage duration of connections, which is not directly related to structural performance. Simple and complex connections may describe a wide range of connection types but fail to address the specific mechanics of