Bolted Connections

Bolted connection

Steel structures are incomplete without connections they indeed play an important role in steel structure formation. Unlike concrete structures steel connections are properly designed affirming to respective codes. Connections also become necessary when a certain length of member is needed to be
connected with the succeeding member because of limitations in available length.

Hence here come a nut and bolt connections. We have seen bolted connections in various steel structures, but have you ever imagine why they are so different in pattern, sizes, and the way they are assemble. All these questions account for the variations that we have in our connections. Let’s talk about dishes in which we have many recipes you choose one which makes the dish delicious similarly out of the many connections we have to take the desire one which confronts the design constraints and gives strength to the connection. The main component of a connection which holds the connected assembly together is bolt, with regard to the reaction which the connection has to sustain the bolt, no of bolts and their pattern is designed.

The connectors are also called as fasteners because besides connecting the member they also play a prime role in transmitting force from one component to other. That is why they have to be design taking considerations of the loads which will act, as well as the reactions that would be generate in the structure. An inadequate or faulty connection can lead to failure of the structure. Primarily bolts are the first choice for connection than rivets and weld. Bolts are designed for their shearing and bearing strength minimum of which will give their design strength. Bolts are selected according to their sizes and strength, material made of, from respective codes.

 

Types of connections

  • a) Framed connections
         In this double angles are connected with bolts on either side of the web of the beam.
  • b) Shear End-Plate Connections
         The primary use of the shear end-plate is to resist gravity load. In this type of connection a shear plate is welded to supporting member and bolted to        connecting member.
  • c) Seated connections
          Where the beam reactions are very large that only shear connection is not enough in such situations we go with seat connection. In this a seat angle         is added to provide an extra support to the connecting member. There are mainly two types of seated connections,
    1) Unstiffened seated connection
         In this arrangement a seat angle bolted to the column supports the end of the beam. This seat angle also helps during the erection of the beam to its       position.
    2) Stiffened seated connection
  • Stiffened as the name suggest its self is to provide stiffness to the connection which is acquired by providing stiffeners to the connecting members which will give stability to the member.
  • d) Moment resistance bolted connection.
  • There are instances when connections are required to transmit moments in addition to shear loads in such situations a double angle connection with a cleat angle and seat angle is provided.

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