This is a double web angle shear connection, bolted to both the beam and girder webs. The angles would be shop-bolted to the beam, then field bolted to the girder web.
Note that the bolts are staggered to facilitate the use of an impact wrench under tight clearance conditions. If there is plenty of clearance to access the bolt heads it is not necessary to stagger them as shown here. Also note that the beam is coped on both flanges. This condition requires additional design checks. The angles used in this connection are generally thin enough to deform under eccentric load and cause the connection to behave as a pure shear connection.
