Jib cranes are a type of overhead lifting device that are often used in a smaller work area for repetitive and unique lifting tasks.

In this project , design calculation of 4T Jib crane is performed as per guidelines of IS 15419, IS-807 and IS-800:2007 to validate the structural design of all members.

As per IS 15419, IS-807 cl.8.4 & IS-800:2007 cl.5.3.3, acceptability of a design is confirmed by satisfying the below mentioned Load Cases and Combinations.
 

Load Cases

 

1. DL = Dead Load (Self Wt. of crane)

2. LL = Safe Working Load of 4000kg (4T)

3. Horizontal loads due to slewing motion (HL)

   1. CFORX (centrifugal force)

   2. INFOR (Inertia force)

4. WX = Wind Load in X-direction

5. WZ = Wind Load in Z-direction.

6. ELX = Seismic Load in X-direction

7. ELZ = Seismic Load in Z-direction.

Load Combinations as per IS 807
 

As per clause 8.4:

M is the duty factor, ψ is -the impact factor.

 

1. M (DL+ ψ LL + (CFORX + ELX + 0.3ELZ)) + WLX (Design Criteria)

2. M (DL+ ψ LL + (INFOR + 0.3ELX + ELZ)) + WLZ (Design Criteria)

 

 

Load Combinations as per IS 800

 

As per clause 3.5.1 and 5.3.3:

• Design Criteria

1. 1.5(DL+LL)

2. 1.2(DL+LL+WX)

3. 1.2(DL+LL+WZ)

4. 1.2(DL+LL+ ELX + 0.3ELZ)

5. 1.2(DL+LL+ 0.3ELX + ELZ)

 

• Serviceability Criteria

1. 1.0(DL+LL)

2. DL + 0.8 (LL + WLX)

3. DL + 0.8 (LL + WLZ)

4. DL+ 0.8 (LL+ ELX + 0.3ELZ)

5. DL+ 0.8 (LL+ 0.3ELX + ELZ)

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